1
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Zhou Z, Huang X, Wei QY, Wang YL, Wu B, Yang JM. Access to Piperazine-Fused Pyrrolocarbazoles Enabled by Acid-Catalyzed Stereoselective Hydroarylation of Ynamide-Indoles and Subsequent Diels-Alder Reactions/Aromatizations. Org Lett 2024. [PMID: 39133635 DOI: 10.1021/acs.orglett.4c01889] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/16/2024]
Abstract
Pyrrolocarbazole skeletons are well known to possess a variety of biological activities that might be therapeutically useful in the treatment of cancers. Herein, an acid-catalyzed stereoselective hydroarylation/Diels-Alder cycloaddition/aromatization of ynamide-indoles is described. We newly designed and synthesized a variety of piperazine-fused pyrrolocarbazole derivatives that could be further applied to the synthesis of potent Wee1 inhibitors.
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Affiliation(s)
- Ze Zhou
- School of Pharmaceutical Sciences, South-Central Minzu University, Wuhan 430074, People's Republic of China
| | - Xiang Huang
- School of Pharmaceutical Sciences, South-Central Minzu University, Wuhan 430074, People's Republic of China
| | - Qing-Yi Wei
- School of Pharmaceutical Sciences, South-Central Minzu University, Wuhan 430074, People's Republic of China
| | - Yi-Lin Wang
- School of Pharmaceutical Sciences, South-Central Minzu University, Wuhan 430074, People's Republic of China
| | - Bin Wu
- School of Pharmaceutical Sciences, South-Central Minzu University, Wuhan 430074, People's Republic of China
| | - Jin-Ming Yang
- School of Pharmaceutical Sciences, South-Central Minzu University, Wuhan 430074, People's Republic of China
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2
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Satyanarayana ANV, Chatterjee T. HFIP-Mediated, Highly Chemo-, Regio-, and Stereoselective Hydrofunctionalizations of Ynamides: Access to Stereodefined Alkenes Bearing Drugs and Natural Products. J Org Chem 2024. [PMID: 39120065 DOI: 10.1021/acs.joc.4c01373] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/10/2024]
Abstract
We disclose a sustainable and versatile synthetic strategy for the highly chemo-, regio-, and stereoselective hydrofunctionalizations of ynamides, through its activation by a solvent, HFIP, to access a wide variety of stereodefined ketene N,N, N,O, N,S, and N,Se acetals in high yield at room temperature. The reaction proceeded through the formation of the reactive keteniminium ion intermediate, formed via protonation at the β-carbon of ynamide by HFIP, followed by an attack of a nucleophile (syn-addition) at the α-carbon. When ynamides are treated with only HFIP at room temperature, the HFIP addition products of ynamides are formed in a 100% atom-economic fashion; however, in the presence of a stronger N-/O-/S-/Se-based nucleophile, the corresponding syn-hydroheterofunctionalized products are formed. Notably, HFIP played multiple roles, such as a reagent, in particular, a Brønsted acid, nucleophile, as well as solvent. Interestingly, HFIP is found to be unique for this transformation. Notably, this strategy is utilized for the late-stage functionalization of several marketed drugs and natural products, and it also enables the connection of two different drugs or a drug and a natural product through chemical bonds. Significantly, HFIP was recovered after the reaction and reused for consecutive reactions.
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Affiliation(s)
- Appanapalli N V Satyanarayana
- Department of Chemistry, Birla Institute of Technology and Science, Pilani (BITS Pilani), Hyderabad Campus, Jawahar Nagar, Hyderabad, Telangana 500078, India
| | - Tanmay Chatterjee
- Department of Chemistry, Birla Institute of Technology and Science, Pilani (BITS Pilani), Hyderabad Campus, Jawahar Nagar, Hyderabad, Telangana 500078, India
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3
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Lenko I, Mamontov A, Alayrac C, Witulski B. Pallado-Catalyzed Cascade Synthesis of 2-Alkoxyquinolines from 1,3-Butadiynamides. Molecules 2024; 29:3505. [PMID: 39124910 PMCID: PMC11314358 DOI: 10.3390/molecules29153505] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2024] [Revised: 07/23/2024] [Accepted: 07/24/2024] [Indexed: 08/12/2024] Open
Abstract
A novel synthesis strategy to access 2-alkoxyquinoline derivatives via a palladium-driven cascade reaction is disclosed. Unlike classic methods based on the alkylation of 2-quinolones with alkyl halides, the present method benefits from the de novo assembly of the quinoline core starting from 1,3-butadiynamides. Palladium-catalyzed reaction cascades with N-(2-iodophenyl)-N-tosyl-1,3-butadiynamides and primary alcohols as external nucleophiles proceed under mild reaction conditions and selectively deliver a variety of differently functionalized 4-alkenyl 2-alkoxyquinolines in a single batch transformation.
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Affiliation(s)
| | | | - Carole Alayrac
- Laboratoire de Chimie Moléculaire et Thio-organique (LCMT), CNRS UMR 6507, ENSICAEN, Université de Caen, Normandie Univ, 6 Bd Maréchal Juin, 14050 Caen, France
| | - Bernhard Witulski
- Laboratoire de Chimie Moléculaire et Thio-organique (LCMT), CNRS UMR 6507, ENSICAEN, Université de Caen, Normandie Univ, 6 Bd Maréchal Juin, 14050 Caen, France
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4
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Yang JM, Feng GC, Huang X, Wang YL, Wei QY, Wu B. Rhodium(III)-Catalyzed Intramolecular Cyclization and Sequential Aromatization of Ynamides with Propargyl Esters: Access to 2,5-Dihydropyrroles and Pyrroles. Org Lett 2024; 26:6191-6196. [PMID: 39007534 DOI: 10.1021/acs.orglett.4c02079] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/16/2024]
Abstract
Disclosed herein is a rhodium(III)-catalyzed intramolecular cyclization of ynamides with propargyl esters. A variety of highly functionalized 2,5-dihydropyrroles were obtained in moderate to good yields with high E/Z selectivities. Subsequent oxidation of the products gave valuable pyrrole derivatives. Additionally, scale-up reactions and late-stage derivatizations highlight the potential synthetic utility of this methodology.
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Affiliation(s)
- Jin-Ming Yang
- School of Pharmaceutical Sciences, South-Central Minzu University, Wuhan, Hubei 430074, People's Republic of China
| | - Guang-Chao Feng
- School of Pharmaceutical Sciences, South-Central Minzu University, Wuhan, Hubei 430074, People's Republic of China
| | - Xiang Huang
- School of Pharmaceutical Sciences, South-Central Minzu University, Wuhan, Hubei 430074, People's Republic of China
| | - Yi-Lin Wang
- School of Pharmaceutical Sciences, South-Central Minzu University, Wuhan, Hubei 430074, People's Republic of China
| | - Qing-Yi Wei
- School of Pharmaceutical Sciences, South-Central Minzu University, Wuhan, Hubei 430074, People's Republic of China
| | - Bin Wu
- School of Pharmaceutical Sciences, South-Central Minzu University, Wuhan, Hubei 430074, People's Republic of China
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5
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Wang X, Sun J, Huang H, Tang G, Chen P, Xiang M, Li L, Zhang ZM, Gao L, Yao SQ. Kinase Inhibition via Small Molecule-Induced Intramolecular Protein Cross-Linking. Angew Chem Int Ed Engl 2024; 63:e202404195. [PMID: 38695161 DOI: 10.1002/anie.202404195] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/29/2024] [Indexed: 07/02/2024]
Abstract
Remarkable progress has been made in the development of cysteine-targeted covalent inhibitors. In kinase drug discovery, covalent inhibitors capable of targeting other nucleophilic residues (i.e. lysine, or K) have emerged in recent years. Besides a highly conserved catalytic lysine, almost all human protein kinases possess an equally conserved glutamate/aspartate (e.g. E/D) that forms a K-E/D salt bridge within the enzyme's active site. Electrophilic ynamides were previously used as effective peptide coupling reagents and to develop E/D-targeting covalent protein inhibitors/probes. In the present study, we report the first ynamide-based small-molecule inhibitors capable of inducing intramolecular cross-linking of various protein kinases, leading to subsequent irreversible inhibition of kinase activity. Our strategy took advantage of the close distance between the highly conserved catalytic K and E/D residues in a targeted kinase, thus providing a conceptually general approach to achieve irreversible kinase inhibition with high specificity and desirable cellular potency. Finally, this ynamide-facilitated, ligand-induced mechanism leading to intramolecular kinase cross-linking and inhibition was unequivocally established by using recombinant ABL kinase as a representative.
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Affiliation(s)
- Xuan Wang
- School of Pharmaceutical Sciences (Shenzhen), Sun Yat-sen University, Shenzhen, 518107, China
| | - Jie Sun
- School of Pharmaceutical Sciences (Shenzhen), Sun Yat-sen University, Shenzhen, 518107, China
| | - Huisi Huang
- School of Pharmacy, Jinan University, 601 West Huangpu Avenue West, Guangzhou, 510632, China
| | - Guanghui Tang
- Department of Chemistry, National University of Singapore, Singapore, 117543, Singapore
| | - Peng Chen
- School of Pharmaceutical Sciences (Shenzhen), Sun Yat-sen University, Shenzhen, 518107, China
| | - Menghua Xiang
- School of Pharmaceutical Sciences (Shenzhen), Sun Yat-sen University, Shenzhen, 518107, China
| | - Lin Li
- The Institute of Flexible Electronics (IFE, Future Technologies), Xiamen University, Xiamen, 361005, China
| | - Zhi-Min Zhang
- School of Pharmacy, Jinan University, 601 West Huangpu Avenue West, Guangzhou, 510632, China
| | - Liqian Gao
- School of Pharmaceutical Sciences (Shenzhen), Sun Yat-sen University, Shenzhen, 518107, China
| | - Shao Q Yao
- Department of Chemistry, National University of Singapore, Singapore, 117543, Singapore
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6
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Galibert-Guijarro A, Tronc J, Mouysset D, Siri D, Gastaldi S, Bertrand MP, Feray L. Investigation of UV Light-Promoted Synthesis of α-Sulfonyl Amides from N-Sulfonyl Ynamides. J Org Chem 2024; 89:9695-9699. [PMID: 38965935 DOI: 10.1021/acs.joc.4c01013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/06/2024]
Abstract
UV light-promoted synthesis of α-sulfonyl amides from N-sulfonyl ynamides without any additives is reported. The reaction proceeds through a radical chain mechanism involving the photoinduced cleavage of the nitrogen-sulfur bond and addition of an electrophilic sulfonyl radical to the triple bond of the ynamide followed by β-fragmentation of the sulfonyl group leading to a ketenimine hydrated upon workup. This highly efficient rearrangement leads, after acidic treatment, to a wide range of α-sulfonyl amides in high yields.
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Affiliation(s)
| | - Jérémy Tronc
- Aix Marseille Univ, CNRS, ICR, Marseille, 13013, France
| | | | - Didier Siri
- Aix Marseille Univ, CNRS, ICR, Marseille, 13013, France
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7
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Kanikarapu S, Prasad R, Sethi M, Sahoo AK. Gold(I)-catalysed cyclisation of ( E)-ketene- N, O-acetals: a synthetic route toward spiro-oxazole-γ-lactones. Org Biomol Chem 2024; 22:4672-4679. [PMID: 38805239 DOI: 10.1039/d4ob00551a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/29/2024]
Abstract
In this study, we developed a cascade 5,5-cyclisation of internal ketene-N,O-acetals utilizing homogeneous Au(I) catalysis. This process involves an initial 5-exo-dig carbocyclisation, followed by a 5-exo-dig heterocyclisation that stereoselectively incorporates the O-atom of a water molecule into an N-tethered propargyl alkyne. This sequential reaction results in the formation of one C-C, two C-O, and two C-I bonds, ultimately leading to the synthesis of spiro-α-iodo-γ-lactone structures featuring oxazole rings in good yields.
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Affiliation(s)
- Suresh Kanikarapu
- School of Chemistry, University of Hyderabad, Hyderabad 500046, India.
| | - Rangu Prasad
- School of Chemistry, University of Hyderabad, Hyderabad 500046, India.
| | - Manoj Sethi
- School of Chemistry, University of Hyderabad, Hyderabad 500046, India.
| | - Akhila K Sahoo
- School of Chemistry, University of Hyderabad, Hyderabad 500046, India.
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8
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Li J, Zhou Y, Luo J, Chen H, Qi H, Zheng H, Zhu G. Controllable Synthesis of Cyclopenta[ b]indolines via Photocatalytic Fluoroalkylative Radical Cyclization Cascade of Ynamides. Org Lett 2024. [PMID: 38809572 DOI: 10.1021/acs.orglett.4c01368] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/30/2024]
Abstract
A de novo method for direct construction of cyclopenta[b]indolines via a photocatalytic fluoroalkylative radical cyclization cascade of ynamides has been established, which proceeds via a sequence of radical addition, 1,5-HAT, 5-endo-trig cyclization, intramolecular arylation, and oxidative deprotonation. This protocol allows for the controllable assembly of a tricyclic architecture with three contiguous stereocenters, showcasing its high efficiency, compatibility, and regio- and diastereoselectivity for accessing pharmacologically significant fluoroalkylated cyclopenta[b]indolines. It represents one of the very few examples of tetrafunctionalization of alkynes.
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Affiliation(s)
- Ji Li
- Key Laboratory of the Ministry of Education for Advanced Catalysis Materials, College of Chemistry and Materials Science, Zhejiang Normal University, Jinhua 321004, China
| | - Yulu Zhou
- Key Laboratory of the Ministry of Education for Advanced Catalysis Materials, College of Chemistry and Materials Science, Zhejiang Normal University, Jinhua 321004, China
| | - Jinmin Luo
- Key Laboratory of the Ministry of Education for Advanced Catalysis Materials, College of Chemistry and Materials Science, Zhejiang Normal University, Jinhua 321004, China
| | - Huiqin Chen
- Key Laboratory of the Ministry of Education for Advanced Catalysis Materials, College of Chemistry and Materials Science, Zhejiang Normal University, Jinhua 321004, China
| | - Hangkai Qi
- Key Laboratory of the Ministry of Education for Advanced Catalysis Materials, College of Chemistry and Materials Science, Zhejiang Normal University, Jinhua 321004, China
| | - Hanliang Zheng
- Key Laboratory of the Ministry of Education for Advanced Catalysis Materials, College of Chemistry and Materials Science, Zhejiang Normal University, Jinhua 321004, China
| | - Gangguo Zhu
- Key Laboratory of the Ministry of Education for Advanced Catalysis Materials, College of Chemistry and Materials Science, Zhejiang Normal University, Jinhua 321004, China
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9
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Chen J, Wang N, Qi C, Chang J, Wang XN. Brønsted acid catalyzed Ficini [2 + 2] cycloaddition of ynamides with enones. Org Biomol Chem 2024; 22:4264-4268. [PMID: 38742913 DOI: 10.1039/d4ob00470a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/16/2024]
Abstract
Herein, we describe a novel metal-free Brønsted acid-catalyzed Ficini [2 + 2] cycloaddition of ynamides with enones under mild reaction conditions, leading to the formation of various cyclobutenamides in generally good to excellent yields within short reaction times. This work represents the first example of ynamides involved in a nonmetal-catalyzed [2 + 2] cycloaddition with enones.
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Affiliation(s)
- Jinyue Chen
- Pingyuan Laboratory, State Key Laboratory of Antiviral Drugs, Key Laboratory of Advanced Drug Preparation Technologies, Ministry of Education, School of Pharmaceutical Sciences, Zhengzhou University, Zhengzhou 450001, P. R. China.
| | - Nanfang Wang
- Pingyuan Laboratory, State Key Laboratory of Antiviral Drugs, Key Laboratory of Advanced Drug Preparation Technologies, Ministry of Education, School of Pharmaceutical Sciences, Zhengzhou University, Zhengzhou 450001, P. R. China.
| | - Chaofan Qi
- Pingyuan Laboratory, State Key Laboratory of Antiviral Drugs, Key Laboratory of Advanced Drug Preparation Technologies, Ministry of Education, School of Pharmaceutical Sciences, Zhengzhou University, Zhengzhou 450001, P. R. China.
| | - Junbiao Chang
- Pingyuan Laboratory, State Key Laboratory of Antiviral Drugs, Key Laboratory of Advanced Drug Preparation Technologies, Ministry of Education, School of Pharmaceutical Sciences, Zhengzhou University, Zhengzhou 450001, P. R. China.
| | - Xiao-Na Wang
- Pingyuan Laboratory, State Key Laboratory of Antiviral Drugs, Key Laboratory of Advanced Drug Preparation Technologies, Ministry of Education, School of Pharmaceutical Sciences, Zhengzhou University, Zhengzhou 450001, P. R. China.
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10
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Choudhary S, Gayyur, Mandal A, Patra A, Kant R, Ghosh N. Copper/Zinc-Catalyzed Stitching of 2-Carbonylanilines with Bis(ynamides): Access to Pyrrolo[2,3- b]quinolines and Its Photophysical Studies. J Org Chem 2024; 89:6274-6280. [PMID: 38642061 DOI: 10.1021/acs.joc.4c00267] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/22/2024]
Abstract
Herein, a one-pot desulfonylative protocol enabled by copper(II)/zinc(II) salts to access pyrrolo[2,3-b]quinolines in good to excellent yields from 2-carbonylanilines and ynamide-derived buta-1,3-diynes has been reported. Significantly, various 2-carbonylanilines carrying reactive functional groups are well tolerated. Moreover, a gram-scale synthesis and synthetic application highlight the practical utility of the current protocol. Notably, the fluorescence properties of pyrrolo[2,3-b]quinolines have been recorded, and their potential use as a fluorescent probe in the imaging of live cells has been demonstrated.
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Affiliation(s)
- Shivani Choudhary
- Medicinal & Process Chemistry Division, CSIR-Central Drug Research Institute, Lucknow, Uttar Pradesh 226031, India
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, Uttar Pradesh 201002, India
| | - Gayyur
- Medicinal & Process Chemistry Division, CSIR-Central Drug Research Institute, Lucknow, Uttar Pradesh 226031, India
| | - Arnab Mandal
- Department of Chemistry, Indian Institute of Science Education and Research Bhopal, Bhopal, Madhya Pradesh 462066, India
| | - Abhijit Patra
- Department of Chemistry, Indian Institute of Science Education and Research Bhopal, Bhopal, Madhya Pradesh 462066, India
| | - Ruchir Kant
- Molecular and Structural Biology Division, CSIR-Central Drug Research Institute, Lucknow, Uttar Pradesh 226031, India
| | - Nayan Ghosh
- Medicinal & Process Chemistry Division, CSIR-Central Drug Research Institute, Lucknow, Uttar Pradesh 226031, India
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, Uttar Pradesh 201002, India
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11
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Hu L, Zhao J. Ynamide Coupling Reagents: Origin and Advances. Acc Chem Res 2024; 57:855-869. [PMID: 38452397 PMCID: PMC10956395 DOI: 10.1021/acs.accounts.3c00743] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2023] [Revised: 02/16/2024] [Accepted: 02/20/2024] [Indexed: 03/09/2024]
Abstract
Since the pioneering work of Curtius and Fischer, chemical peptide synthesis has witnessed a century's development and evolved into a routine technology. However, it is far from perfect. In particular, it is challenged by sustainable development because the state-of-the-art of peptide synthesis heavily relies on legacy reagents and technologies developed before the establishment of green chemistry. Over the past three decades, a broad range of efforts have been made for greening peptide synthesis, among which peptide synthesis using unprotected amino acid represents an ideal and promising strategy because it does not require protection and deprotection steps. Unfortunately, C → N peptide synthesis employing unprotected amino acids has been plagued by undesired polymerization, while N → C inverse peptide synthesis with unprotected amino acids is retarded by severe racemization/epimerization owing to the iterative activation and aminolysis of high racemization/epimerization susceptible peptidyl acids. Consequently, there is an urgent need to develop innovative coupling reagents and strategies with novel mechanisms that can address the long-standing notorious racemization/epimerization issue of peptide synthesis.This Account will describe our efforts in discovery of ynamide coupling reagents and their application in greening peptide synthesis. Over an eight-year journey, ynamide coupling reagents have evolved into a class of general coupling reagents for both amide and ester bond formation. In particular, the superiority of ynamide coupling reagents in suppressing racemization/epimerization enabled them to be effective for peptide fragment condensation, and head-to-tail cyclization, as well as precise incorporation of thioamide substitutions into peptide backbones. The first practical inverse peptide synthesis using unprotected amino acids was successfully accomplished by harnessing such features and taking advantage of a transient protection strategy. Ynamide coupling reagent-mediated ester bond formation enabled efficient intermolecular esterification and macrolactonization with preservation of α-chirality and the configuration of the conjugated α,β-C-C double bond. To make ynamide coupling reagents readily available with reasonable cost and convenience, we have developed a scalable one-step synthetic method from cheap starting materials. Furthermore, a water-removable ynamide coupling reagent was developed, offering a column-free purification of the target coupling product. In addition, the recycle of ynamide coupling reagent was accomplished, thereby paving the way for their sustainable industrial application.As such, this Account presents the whole story of the origin, mechanistic insights, preparation, synthetic applications, and recycle of ynamide coupling reagents with a perspective that highlights their future impact on peptide synthesis.
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Affiliation(s)
- Long Hu
- Affiliated Cancer Hospital, Guangdong
Provincial Key Laboratory of Major Obstetric Diseases, School of Pharmaceutical
Sciences, Guangzhou Medical University, Guangzhou, 511436, China
| | - Junfeng Zhao
- Affiliated Cancer Hospital, Guangdong
Provincial Key Laboratory of Major Obstetric Diseases, School of Pharmaceutical
Sciences, Guangzhou Medical University, Guangzhou, 511436, China
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12
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Zhuo SY, Ye JL, Zheng X. Copper-catalyzed room-temperature cross-dehydrogenative coupling of secondary amides with terminal alkynes: a chemoselective synthesis of ynamides. Org Biomol Chem 2024; 22:1299-1309. [PMID: 38259138 DOI: 10.1039/d3ob02032k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2024]
Abstract
A copper-catalyzed aerobic oxidative cross-dehydrogenative coupling reaction between secondary amides and terminal alkynes has been developed. With the aid of ligands and 3 Å molecular sieves, ynamides can be efficiently synthesized at room temperature and conveniently scaled up. A legitimate mechanism involving nitrogen-centred radicals and copper trivalent intermediates has been proposed.
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Affiliation(s)
- Shuang-Yan Zhuo
- Xiamen Key Laboratory of Chiral Drugs, School of Pharmaceutical Sciences, Xiamen University, Xiamen, Fujian 361102, China.
| | - Jian-Liang Ye
- Fujian Provincial Key Laboratory of Chemical Biology, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, Fujian 361005, China.
| | - Xiao Zheng
- Xiamen Key Laboratory of Chiral Drugs, School of Pharmaceutical Sciences, Xiamen University, Xiamen, Fujian 361102, China.
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13
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Pati SS, Mishra A, Das JP. Regio- and Stereocontrolled Hydrohalogenation of Ynamides with N-Halosuccinimides (NXS) as the Halogen Source: Synthesis of ( E)-α-Haloenamides. J Org Chem 2024; 89:1727-1735. [PMID: 38237061 DOI: 10.1021/acs.joc.3c02436] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2024]
Abstract
Presented herein is a facile stereoselective construction of synthetically versatile chiral and achiral (E)-α-haloenamides under mild conditions utilizing N-halosuccinimides and diphenylphosphine oxide. This reaction is metal-free, mild, efficient, very rapid, and practical and highlights the synthetic versatility of ynamides. The reaction has a broad substrate scope; both chiral and achiral ynamides have been transformed into the corresponding (E)-α-haloenamides within a very short period of time without compromising selectivity or complexity.
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Affiliation(s)
- Subhransu S Pati
- Organic Synthesis and Catalysis Laboratory, Department of Chemistry, Ravenshaw University, Cuttack 753003, India
| | - Archana Mishra
- Organic Synthesis and Catalysis Laboratory, Department of Chemistry, Ravenshaw University, Cuttack 753003, India
| | - Jaya P Das
- Organic Synthesis and Catalysis Laboratory, Department of Chemistry, Ravenshaw University, Cuttack 753003, India
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14
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Talukdar V, Mondal K, Kumar Dhaked D, Das P. CuI/DMAP-Catalyzed Oxidative Alkynylation of 7-Azaindoles: Synthetic Scope and Mechanistic Studies. Chem Asian J 2024:e202300987. [PMID: 38258444 DOI: 10.1002/asia.202300987] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2023] [Revised: 01/10/2024] [Accepted: 01/22/2024] [Indexed: 01/24/2024]
Abstract
An efficient and practical method for the N-alkynylation of 7-azaindoles has been established by using CuI/DMAP catalytic system at room temperature and in open air. This simple protocol has been successfully employed in the synthesis of a wide range of N-alkynylated 7-azaindoles with good yields. Also, this approach is well-suited for large-scale N-alkynylation reactions. The designed N-alkynylated 7-azaindoles were further subjected to Cu-/Ir-catalyzed alkyne-azide cycloaddition (CuAAC/IrAAC) or "click" reaction for the rapid synthesis of 1,4-/1,5 disubstituted 1,2,3-triazole decorated 7-azaindoles. A mechanistic study based on density functional theory (DFT) calculations and ultraviolet-visible (UV) spectroscopic studies revealed that the CuI and DMAP combination formed a [CuII (DMAP)2 I2 ] species, which acts as an active catalyst. The DFT method was used to assess the energetic viability of an organometallic in the C-N bond formation pathway originating from the [CuII (DMAP)2 I2 ] complex. We expect that the newly designed Cu/DMAP/alkyne system will offer valuable insights into the field of Cu-catalyzed transformations.
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Affiliation(s)
- Vishal Talukdar
- Department of Chemistry and Chemical Biology, Indian Institution of Technology (Indian School of Mines), Dhanbad, 826004, Dhanbad (Jharkhand), India
| | - Krishanu Mondal
- Department of Chemistry and Chemical Biology, Indian Institution of Technology (Indian School of Mines), Dhanbad, 826004, Dhanbad (Jharkhand), India
| | - Devendra Kumar Dhaked
- Department of Pharmacoinformatics, National Institute of Pharmaceutical Education and Research, (NIPER) Kolkata, 700054, Kolkata, India
| | - Parthasarathi Das
- Department of Chemistry and Chemical Biology, Indian Institution of Technology (Indian School of Mines), Dhanbad, 826004, Dhanbad (Jharkhand), India
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15
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Su X, Wang Y, Feng Q, Sun J. Heterodifunctionalization of Electron-Rich Alkynes Catalyzed by in Situ Generated Silylium Ions. Org Lett 2024; 26:421-426. [PMID: 38166166 DOI: 10.1021/acs.orglett.3c04208] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2024]
Abstract
Silylium ions are versatile Lewis acids in organic synthesis. While they have been well-known for the activation of σ donors, catalysis initiated by the activation of π donors remains underdeveloped, particularly for alkynes. Herein, we demonstrate an example of silylium-catalyzed alkyne heterodifunctionalization. The silylium ion generated in situ from HNTf2 and the silyl reagent serve as superior catalysts in the efficient silylphosphination and silylcyanation of electron-rich alkynes with excellent regio- and stereoselectivity. The compatibility of this protocol with strongly coordinating ligands (Ph2P and CN) not only complements the metal-catalyzed systems but also expands the scope of silylium-catalyzed reactions.
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Affiliation(s)
- Xiang Su
- School of Biomedical and Pharmaceutical Sciences, Guangdong University of Technology, Guangzhou 510006, China
| | - Yong Wang
- Department of Chemistry and the Hong Kong Branch of Chinese National Engineering Research Centre for Tissue Restoration and Reconstruction, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong Special Administrative Region, China
| | - Qiang Feng
- Department of Chemistry and the Hong Kong Branch of Chinese National Engineering Research Centre for Tissue Restoration and Reconstruction, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong Special Administrative Region, China
| | - Jianwei Sun
- Department of Chemistry and the Hong Kong Branch of Chinese National Engineering Research Centre for Tissue Restoration and Reconstruction, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong Special Administrative Region, China
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16
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Wang XN, Wang Y, Wang N, Chen J, Qi C, Chang J. TMSOTf-Catalyzed Reactions of N-Arylynamides with Sulfilimines To Construct 2-Aminoindoles and α-Arylated Amidines. J Org Chem 2024. [PMID: 38178688 DOI: 10.1021/acs.joc.3c02342] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2024]
Abstract
Here, we disclose an efficient TMSOTf-catalyzed C-H annulation of aryl-terminated N-arylynamides with sulfilimines, leading to the practical assembly of various valuable 2-aminoindoles in generally moderate to excellent yields with a broad range of functional groups, while nonaryl terminated N-arylynamides undergo TMSOTf-catalyzed aminative arylation with sulfilimines providing α-arylated amidines.
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Affiliation(s)
- Xiao-Na Wang
- Collaborative Innovation Center of New Drug Research and Safety Evaluation, Key Laboratory of Advanced Drug Preparation Technologies, Ministry of Education, School of Pharmaceutical Sciences, Zhengzhou University, Zhengzhou, Henan Province 450001, P. R. China
| | - Yanan Wang
- Collaborative Innovation Center of New Drug Research and Safety Evaluation, Key Laboratory of Advanced Drug Preparation Technologies, Ministry of Education, School of Pharmaceutical Sciences, Zhengzhou University, Zhengzhou, Henan Province 450001, P. R. China
| | - Nanfang Wang
- Collaborative Innovation Center of New Drug Research and Safety Evaluation, Key Laboratory of Advanced Drug Preparation Technologies, Ministry of Education, School of Pharmaceutical Sciences, Zhengzhou University, Zhengzhou, Henan Province 450001, P. R. China
| | - Jinyue Chen
- Collaborative Innovation Center of New Drug Research and Safety Evaluation, Key Laboratory of Advanced Drug Preparation Technologies, Ministry of Education, School of Pharmaceutical Sciences, Zhengzhou University, Zhengzhou, Henan Province 450001, P. R. China
| | - Chaofan Qi
- Collaborative Innovation Center of New Drug Research and Safety Evaluation, Key Laboratory of Advanced Drug Preparation Technologies, Ministry of Education, School of Pharmaceutical Sciences, Zhengzhou University, Zhengzhou, Henan Province 450001, P. R. China
| | - Junbiao Chang
- Collaborative Innovation Center of New Drug Research and Safety Evaluation, Key Laboratory of Advanced Drug Preparation Technologies, Ministry of Education, School of Pharmaceutical Sciences, Zhengzhou University, Zhengzhou, Henan Province 450001, P. R. China
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17
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Maity A, Sahoo AK. Copper-Catalyzed Regio- and Stereoselective Hydroarylation of Ynamide. J Org Chem 2024. [PMID: 38170946 DOI: 10.1021/acs.joc.3c01720] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2024]
Abstract
Presented herein is a copper-catalyzed trans-hydroarylation of ynamides. The reaction showcases the assembly of boronic acids across the carbon-carbon triple bond of ynamides. The reaction proceeds under mild conditions offering a complementary approach for the versatile synthesis of multifunctional (E)-α,β-disubstituted enamides. Moreover, the hydroarylation process is highly regio- and stereoselective. The transformation shows a broad scope (30 examples) and tolerates a wide range of labile functional groups. Control experiments provide substantive evidence supporting the mechanistic cycle and the observed selectivity.
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Affiliation(s)
- Avijit Maity
- School of Chemistry, University of Hyderabad, Hyderabad 500046, India
| | - Akhila K Sahoo
- School of Chemistry, University of Hyderabad, Hyderabad 500046, India
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18
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Peschke F, Taladriz‐Sender A, Andrews MJ, Watson AJB, Burley GA. Glutathione Mediates Control of Dual Differential Bio-orthogonal Labelling of Biomolecules. ANGEWANDTE CHEMIE (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2023; 135:e202313063. [PMID: 38515866 PMCID: PMC10953330 DOI: 10.1002/ange.202313063] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/05/2023] [Indexed: 03/23/2024]
Abstract
Traditional approaches to bio-orthogonal reaction discovery have focused on developing reagent pairs that react with each other faster than they are metabolically degraded. Glutathione (GSH) is typically responsible for the deactivation of most bio-orthogonal reagents. Here we demonstrate that GSH promotes a Cu-catalysed (3+2) cycloaddition reaction between an ynamine and an azide. We show that GSH acts as a redox modulator to control the Cu oxidation state in these cycloadditions. Rate enhancement of this reaction is specific for ynamine substrates and is tuneable by the Cu:GSH ratio. This unique GSH-mediated reactivity gradient is then utilised in the dual sequential bio-orthogonal labelling of peptides and oligonucleotides via two distinct chemoselective (3+2) cycloadditions.
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Affiliation(s)
- Frederik Peschke
- Department of Pure & Applied Chemistry & the Strathclyde Centre for Molecular BioscienceUniversity of Strathclyde295 Cathedral StreetGlasgowG1 1XLUK
| | - Andrea Taladriz‐Sender
- Department of Pure & Applied Chemistry & the Strathclyde Centre for Molecular BioscienceUniversity of Strathclyde295 Cathedral StreetGlasgowG1 1XLUK
| | - Matthew J. Andrews
- EaStCHEMSchool of ChemistryUniversity of Saint AndrewsNorth HaughSt AndrewsFifeKY16 9STUK
| | - Allan J. B. Watson
- EaStCHEMSchool of ChemistryUniversity of Saint AndrewsNorth HaughSt AndrewsFifeKY16 9STUK
| | - Glenn A. Burley
- Department of Pure & Applied Chemistry & the Strathclyde Centre for Molecular BioscienceUniversity of Strathclyde295 Cathedral StreetGlasgowG1 1XLUK
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19
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Peschke F, Taladriz‐Sender A, Andrews MJ, Watson AJB, Burley GA. Glutathione Mediates Control of Dual Differential Bio-orthogonal Labelling of Biomolecules. Angew Chem Int Ed Engl 2023; 62:e202313063. [PMID: 37906440 PMCID: PMC10952886 DOI: 10.1002/anie.202313063] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2023] [Revised: 10/25/2023] [Accepted: 10/31/2023] [Indexed: 11/02/2023]
Abstract
Traditional approaches to bio-orthogonal reaction discovery have focused on developing reagent pairs that react with each other faster than they are metabolically degraded. Glutathione (GSH) is typically responsible for the deactivation of most bio-orthogonal reagents. Here we demonstrate that GSH promotes a Cu-catalysed (3+2) cycloaddition reaction between an ynamine and an azide. We show that GSH acts as a redox modulator to control the Cu oxidation state in these cycloadditions. Rate enhancement of this reaction is specific for ynamine substrates and is tuneable by the Cu:GSH ratio. This unique GSH-mediated reactivity gradient is then utilised in the dual sequential bio-orthogonal labelling of peptides and oligonucleotides via two distinct chemoselective (3+2) cycloadditions.
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Affiliation(s)
- Frederik Peschke
- Department of Pure & Applied Chemistry & the Strathclyde Centre for Molecular BioscienceUniversity of Strathclyde295 Cathedral StreetGlasgowG1 1XLUK
| | - Andrea Taladriz‐Sender
- Department of Pure & Applied Chemistry & the Strathclyde Centre for Molecular BioscienceUniversity of Strathclyde295 Cathedral StreetGlasgowG1 1XLUK
| | - Matthew J. Andrews
- EaStCHEMSchool of ChemistryUniversity of Saint AndrewsNorth HaughSt AndrewsFifeKY16 9STUK
| | - Allan J. B. Watson
- EaStCHEMSchool of ChemistryUniversity of Saint AndrewsNorth HaughSt AndrewsFifeKY16 9STUK
| | - Glenn A. Burley
- Department of Pure & Applied Chemistry & the Strathclyde Centre for Molecular BioscienceUniversity of Strathclyde295 Cathedral StreetGlasgowG1 1XLUK
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20
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Wei L, Xiao X, Cai M. Recyclable gold(I)-catalyzed heterocyclization of ynamides with benzyl or indolyl azides towards 2-aminoindoles or 3-amino-β-carbolines. Org Biomol Chem 2023; 21:8757-8766. [PMID: 37877426 DOI: 10.1039/d3ob01555f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2023]
Abstract
A highly efficient heterogeneous gold(I)-catalyzed heterocyclization of ynamides with benzyl or indolyl azides has been achieved in 1,2-dichloroethane under mild conditions via a heterogenized α-imino gold carbene intermediate using 5 mol% of SBA-15-anchored strongly hindered NHC-gold(I) complex [IPr-SBA-15-AuNTf2] as the catalyst, delivering a wide range of valuable 2-aminoindoles or 3-amino-β-carbolines in mostly good to excellent yields with high regioselectivity. Furthermore, the new heterogenized NHC-gold(I) complex displays the same catalytic activity as IPrAuNTf2 and is facile to recover by centrifugation of the reaction mixture and can be reused at least seven times without any appreciable drop in its catalytic activity.
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Affiliation(s)
- Li Wei
- Key Lab of Fluorine and Silicon for Energy Materials and Chemistry of Ministry of Education and College of Chemistry & Chemical Engineering, Jiangxi Normal University, Nanchang 330022, China.
| | - Xiaoqiang Xiao
- Key Lab of Fluorine and Silicon for Energy Materials and Chemistry of Ministry of Education and College of Chemistry & Chemical Engineering, Jiangxi Normal University, Nanchang 330022, China.
| | - Mingzhong Cai
- Key Lab of Fluorine and Silicon for Energy Materials and Chemistry of Ministry of Education and College of Chemistry & Chemical Engineering, Jiangxi Normal University, Nanchang 330022, China.
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21
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Pigulski B, Misiak K, Męcik P, Szafert S. Cycloaddition-Retro-Electrocyclization Click Reaction of Amine End-Capped Oligoynes with Tetracyanoethylene. Chemistry 2023:e202302725. [PMID: 37702289 DOI: 10.1002/chem.202302725] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2023] [Revised: 09/12/2023] [Accepted: 09/13/2023] [Indexed: 09/14/2023]
Abstract
This study shows the first example of cycloaddition-retro-electrocyclization (CA-RE) click reaction involving nitrogen end-capped push-pull oligoynes. The reported CA-RE reaction with TCNE (tetracyanoethylene) is fully regioselective and leads exclusively to the unprecedented TCBD (tetracyanobuta-1,3-diene-2,3-diyl) end-capped carbon rods. The molecular structure of the products was unambiguously confirmed using X-ray single crystal diffraction and their optical and electronic properties were investigated experimentally and rationalized using DFT (density functional theory) calculations.
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Affiliation(s)
- Bartłomiej Pigulski
- Faculty of Chemistry, University of Wrocław, F. Joliot-Curie 14, 50-383, Wrocław, Poland
| | - Klaudia Misiak
- Faculty of Chemistry, University of Wrocław, F. Joliot-Curie 14, 50-383, Wrocław, Poland
| | - Patrycja Męcik
- Faculty of Chemistry, University of Wrocław, F. Joliot-Curie 14, 50-383, Wrocław, Poland
| | - Sławomir Szafert
- Faculty of Chemistry, University of Wrocław, F. Joliot-Curie 14, 50-383, Wrocław, Poland
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22
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Yang L, Hou A, Jiang Q, Cheng M, Liu Y. Methodological Development and Applications of Tryptamine-Ynamide Cyclizations in Synthesizing Core Skeletons of Indole Alkaloids. J Org Chem 2023; 88:11377-11391. [PMID: 37540141 DOI: 10.1021/acs.joc.3c01088] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/05/2023]
Abstract
Over the past two decades, synthetic strategies for synthesizing the skeletons of various indole alkaloids based on tryptamine-ynamide have been continuously developed and applied to the total syntheses or formal total syntheses of related molecules. In this synopsis, we summarized the cyclization pathways of tryptamine-ynamide under different catalytic conditions, emphasizing the reaction mechanism and applications in the syntheses of indole alkaloids.
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Affiliation(s)
- Lu Yang
- Key Laboratory of Structure-Based Drug Design and Discovery of Ministry of Education, Shenyang Pharmaceutical University, Shenyang 110016, P. R. China
- Wuya College of Innovation, Shenyang Pharmaceutical University, Shenyang 110016, P. R. China
- Institute of Drug Research in Medicine Capital of China, Benxi 117000, P. R. China
| | - Anbin Hou
- Key Laboratory of Structure-Based Drug Design and Discovery of Ministry of Education, Shenyang Pharmaceutical University, Shenyang 110016, P. R. China
- Wuya College of Innovation, Shenyang Pharmaceutical University, Shenyang 110016, P. R. China
- Institute of Drug Research in Medicine Capital of China, Benxi 117000, P. R. China
| | - Qing Jiang
- Key Laboratory of Structure-Based Drug Design and Discovery of Ministry of Education, Shenyang Pharmaceutical University, Shenyang 110016, P. R. China
- Wuya College of Innovation, Shenyang Pharmaceutical University, Shenyang 110016, P. R. China
- Institute of Drug Research in Medicine Capital of China, Benxi 117000, P. R. China
| | - Maosheng Cheng
- Key Laboratory of Structure-Based Drug Design and Discovery of Ministry of Education, Shenyang Pharmaceutical University, Shenyang 110016, P. R. China
- Institute of Drug Research in Medicine Capital of China, Benxi 117000, P. R. China
| | - Yongxiang Liu
- Key Laboratory of Structure-Based Drug Design and Discovery of Ministry of Education, Shenyang Pharmaceutical University, Shenyang 110016, P. R. China
- Wuya College of Innovation, Shenyang Pharmaceutical University, Shenyang 110016, P. R. China
- Institute of Drug Research in Medicine Capital of China, Benxi 117000, P. R. China
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23
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Lenko I, Alayrac C, Bożek I, Witulski B. 1,3-Butadiynamides the Ethynylogous Ynamides: Synthesis, Properties and Applications in Heterocyclic Chemistry. Molecules 2023; 28:molecules28114564. [PMID: 37299038 DOI: 10.3390/molecules28114564] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2023] [Revised: 05/30/2023] [Accepted: 06/01/2023] [Indexed: 06/12/2023] Open
Abstract
1,3-butadiynamides-the ethynylogous variants of ynamides-receive considerable attention as precursors of complex molecular scaffolds for organic and heterocyclic chemistry. The synthetic potential of these C4-building blocks reveals itself in sophisticated transition-metal catalyzed annulation reactions and in metal-free or silver-mediated HDDA (Hexa-dehydro-Diels-Alder) cycloadditions. 1,3-Butadiynamides also gain significance as optoelectronic materials and in less explored views on their unique helical twisted frontier molecular orbitals (Hel-FMOs). The present account summarizes different methodologies for the synthesis of 1,3-butadiynamides followed by the description of their molecular structure and electronic properties. Finally, the surprisingly rich chemistry of 1,3-butadiynamides as versatile C4-building blocks in heterocyclic chemistry is reviewed by compiling their exciting reactivity, specificity and opportunities for organic synthesis. Besides chemical transformations and use in synthesis, a focus is set on the mechanistic understanding of the chemistry of 1,3-butadiynamides-suggesting that 1,3-butadiynamides are not just simple alkynes. These ethynylogous variants of ynamides have their own molecular character and chemical reactivity and reflect a new class of remarkably useful compounds.
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Affiliation(s)
- Illia Lenko
- Laboratoire de Chimie Moléculaire et Thio-Organique (LCMT), CNRS UMR 6507, ENSICAEN & UNICAEN, Normandie University, 6 Bd Maréchal Juin, 14050 Caen, France
| | - Carole Alayrac
- Laboratoire de Chimie Moléculaire et Thio-Organique (LCMT), CNRS UMR 6507, ENSICAEN & UNICAEN, Normandie University, 6 Bd Maréchal Juin, 14050 Caen, France
| | - Igor Bożek
- Laboratoire de Chimie Moléculaire et Thio-Organique (LCMT), CNRS UMR 6507, ENSICAEN & UNICAEN, Normandie University, 6 Bd Maréchal Juin, 14050 Caen, France
| | - Bernhard Witulski
- Laboratoire de Chimie Moléculaire et Thio-Organique (LCMT), CNRS UMR 6507, ENSICAEN & UNICAEN, Normandie University, 6 Bd Maréchal Juin, 14050 Caen, France
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24
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Dutta S, Sahoo AK. Three Component syn-1,2-Arylmethylation of Internal Alkynes. Angew Chem Int Ed Engl 2023; 62:e202300610. [PMID: 36701082 DOI: 10.1002/anie.202300610] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2023] [Revised: 01/26/2023] [Accepted: 01/26/2023] [Indexed: 01/27/2023]
Abstract
A Pd-catalyzed three-component syn-1,2-arylmethylation of internal alkynes (ynamides/yne-acetates/alkynes) is described. The readily available and bench stable coupling partners iodo-arenes, and methyl boronic acid are successfully used in this coupling strategy to access the methyl-containing tetra-substituted olefins; the scope is broad showing excellent functional-group tolerance. Notably, the transformation is regio- as well as stereoselective. The biologically relevant motifs (BRM) bearing iodo-arenes and ynamides are also used for the late-stage syn-1,2-arylmethylation of alkynes. Aryl-alkylation, aryl-trideuteriomethylation, alkynyl-methylation, and alkenyl-methylation of ynamides are also presented. The Me-substituted alkenes are further transformed into synthetically important β-amino-indenones and α-fluoro-α'-methyl ketones.
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Affiliation(s)
- Shubham Dutta
- School of Chemistry, University of Hyderabad, Hyderabad, 500046, India
| | - Akhila K Sahoo
- School of Chemistry, University of Hyderabad, Hyderabad, 500046, India
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25
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Galibert-Guijarro A, Mouysset D, Mimoun L, Bertrand MP, Feray L. Ynamides in Radical Reactions: A Route to Original Persubstituted 2-Aminofurans. J Org Chem 2023; 88:2464-2473. [PMID: 36715251 DOI: 10.1021/acs.joc.2c02906] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Mn(OAc)3/Cu(OAc)2-mediated reaction between ynamides, derived from oxazolidone or 3-methylindole carboxylate, and cyclic α-dicarbonyl radicals led to the one-pot synthesis of 2-aminofurans. The transformation involves addition of the α-dicarbonyl radical to ynamide, oxidation to ketene-iminium, and polar cyclization steps to provide original persubstituted 2-aminofurans in good to excellent yields. This work represents the first radical route for the synthesis of furans from ynamides.
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Affiliation(s)
- Aurélien Galibert-Guijarro
- Aix Marseille Univ, CNRS, ICR, Institut de Chimie Radicalaire, UMR 7273, Equipe CMO, Campus Saint-Jérôme, 13013 Marseille, France
| | - Dominique Mouysset
- Aix Marseille Univ, CNRS, ICR, Institut de Chimie Radicalaire, UMR 7273, Equipe CMO, Campus Saint-Jérôme, 13013 Marseille, France
| | - Liliane Mimoun
- Aix Marseille Univ, CNRS, ICR, Institut de Chimie Radicalaire, UMR 7273, Equipe CMO, Campus Saint-Jérôme, 13013 Marseille, France
| | - Michèle P Bertrand
- Aix Marseille Univ, CNRS, ICR, Institut de Chimie Radicalaire, UMR 7273, Equipe CMO, Campus Saint-Jérôme, 13013 Marseille, France
| | - Laurence Feray
- Aix Marseille Univ, CNRS, ICR, Institut de Chimie Radicalaire, UMR 7273, Equipe CMO, Campus Saint-Jérôme, 13013 Marseille, France
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26
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Wang T, Wan Y, Xu M, Wang Y, Hong XJ, Gao H, Zhou Z, Yi W, Zeng Z. Regio- and stereospecific cis-hydrophenoxylation of ynamides with acidic phenols. Org Biomol Chem 2023; 21:3073-3078. [PMID: 36786411 DOI: 10.1039/d3ob00082f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/09/2023]
Abstract
Herein we describe a self-acid-enabled chemo-, regio-, and stereospecific cis-hydrophenoxylation of ynamides under reagent-free conditions. The presence of a non-polar solvent such as toluene was found to be beneficial to facilitate the rate-limiting proton transfer between phenols and ynamides to form an intimate ion pair, which is followed by a swift nucleophilic attack of the phenolate oxygen on keteniminium, fulfilling the overall hydrofunctionalization event. This protocol is operationally simple and easily scalable, tolerates a wide variety of functional groups, and shows good compatibility with the requirements of modern green chemistry.
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Affiliation(s)
- Ting Wang
- Guangzhou Municipal and Guangdong Provincial Key Laboratory of Molecular Target & Clinical Pharmacology, the NMPA and State Key Laboratory of Respiratory Disease, School of Pharmaceutical Sciences and the Fifth Affiliated Hospital, Guangzhou Medical University, Guangzhou, Guangdong 511436, P. R. China.
| | - Yuyan Wan
- Guangzhou Municipal and Guangdong Provincial Key Laboratory of Molecular Target & Clinical Pharmacology, the NMPA and State Key Laboratory of Respiratory Disease, School of Pharmaceutical Sciences and the Fifth Affiliated Hospital, Guangzhou Medical University, Guangzhou, Guangdong 511436, P. R. China.
| | - Mingyao Xu
- Guangzhou Municipal and Guangdong Provincial Key Laboratory of Molecular Target & Clinical Pharmacology, the NMPA and State Key Laboratory of Respiratory Disease, School of Pharmaceutical Sciences and the Fifth Affiliated Hospital, Guangzhou Medical University, Guangzhou, Guangdong 511436, P. R. China.
| | - Yi Wang
- Guangzhou Municipal and Guangdong Provincial Key Laboratory of Molecular Target & Clinical Pharmacology, the NMPA and State Key Laboratory of Respiratory Disease, School of Pharmaceutical Sciences and the Fifth Affiliated Hospital, Guangzhou Medical University, Guangzhou, Guangdong 511436, P. R. China.
| | - Xu-Jia Hong
- Guangzhou Municipal and Guangdong Provincial Key Laboratory of Molecular Target & Clinical Pharmacology, the NMPA and State Key Laboratory of Respiratory Disease, School of Pharmaceutical Sciences and the Fifth Affiliated Hospital, Guangzhou Medical University, Guangzhou, Guangdong 511436, P. R. China.
| | - Hui Gao
- Guangzhou Municipal and Guangdong Provincial Key Laboratory of Molecular Target & Clinical Pharmacology, the NMPA and State Key Laboratory of Respiratory Disease, School of Pharmaceutical Sciences and the Fifth Affiliated Hospital, Guangzhou Medical University, Guangzhou, Guangdong 511436, P. R. China.
| | - Zhi Zhou
- Guangzhou Municipal and Guangdong Provincial Key Laboratory of Molecular Target & Clinical Pharmacology, the NMPA and State Key Laboratory of Respiratory Disease, School of Pharmaceutical Sciences and the Fifth Affiliated Hospital, Guangzhou Medical University, Guangzhou, Guangdong 511436, P. R. China.
| | - Wei Yi
- Guangzhou Municipal and Guangdong Provincial Key Laboratory of Molecular Target & Clinical Pharmacology, the NMPA and State Key Laboratory of Respiratory Disease, School of Pharmaceutical Sciences and the Fifth Affiliated Hospital, Guangzhou Medical University, Guangzhou, Guangdong 511436, P. R. China.
| | - Zhongyi Zeng
- Guangzhou Municipal and Guangdong Provincial Key Laboratory of Molecular Target & Clinical Pharmacology, the NMPA and State Key Laboratory of Respiratory Disease, School of Pharmaceutical Sciences and the Fifth Affiliated Hospital, Guangzhou Medical University, Guangzhou, Guangdong 511436, P. R. China.
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27
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Le Du E, Waser J. Recent progress in alkynylation with hypervalent iodine reagents. Chem Commun (Camb) 2023; 59:1589-1604. [PMID: 36656618 PMCID: PMC9904279 DOI: 10.1039/d2cc06168f] [Citation(s) in RCA: 15] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2022] [Accepted: 12/23/2022] [Indexed: 01/20/2023]
Abstract
Although alkynes are one of the smallest functional groups, they are among the most versatile building blocks for organic chemistry, with applications ranging from biochemistry to material sciences. Alkynylation reactions have traditionally relied on the use of acetylenes as nucleophiles. The discovery and development of ethynyl hypervalent iodine reagents have allowed to greatly expand the transfer of alkynes as electrophilic synthons. In this feature article the progress in the field since 2018 will be presented. After a short introduction on alkynylation reactions and hypervalent iodine reagents, the developments in the synthesis of alkynyl hypervalent iodine reagents will be discussed. Their recent use in base-mediated and transition-metal catalyzed alkynylations will be described. Progress in radical-based alkynylations and atom-economical transformations will then be presented.
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Affiliation(s)
- Eliott Le Du
- Laboratory of Catalysis and Organic Synthesis, Institute of Chemical Sciences and Engineering École Polytechnique Fédérale de Lausanne EPFL, SB ISIC, LCSO, BCH 4306, 1015, Lausanne, Switzerland.
| | - Jérôme Waser
- Laboratory of Catalysis and Organic Synthesis, Institute of Chemical Sciences and Engineering École Polytechnique Fédérale de Lausanne EPFL, SB ISIC, LCSO, BCH 4306, 1015, Lausanne, Switzerland.
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28
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Mahe C, Blacque O, Gasser G, Gandon V, Cariou K. N-Metallocenyl Ynamides: Preparation, Reactivity, and Synthesis of ansa[3]-Ferrocenylamides. Org Lett 2023; 25:624-629. [PMID: 36688847 DOI: 10.1021/acs.orglett.2c04169] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
The first synthesis of various N-metallocenyl ynamides has been developed, and two strategies for the oxidative cyclization of N-ferrocenyl ynamide into ansa[3]-ferrocenylamide are also reported. The mechanism for the iodine(III)-triggered transformation has been studied by means of DFT calculations, showing that it proceeds through a concerted iodination deprotonation step.
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Affiliation(s)
- Capucine Mahe
- Chimie ParisTech, PSL University, CNRS, Institute of Chemistry for Life and Health Sciences, Laboratory for Inorganic Chemical Biology, 75005 Paris, France.,CNRS, Institut de Chimie des Substances Naturelles, LabEx LERMIT, UPR 2301, Université Paris-Saclay, 91198 Gif-sur-Yvette, France
| | - Olivier Blacque
- Department of Chemistry, University of Zurich, Winterthurerstrasse 190, CH-8057 Zurich, Switzerland
| | - Gilles Gasser
- Chimie ParisTech, PSL University, CNRS, Institute of Chemistry for Life and Health Sciences, Laboratory for Inorganic Chemical Biology, 75005 Paris, France
| | - Vincent Gandon
- Institut de Chimie Moléculaire et des Matériaux d'Orsay, CNRS UMR 8182, Université Paris Saclay, 91405 Orsay, France.,Laboratoire de Chimie Moléculaire (LCM), CNRS UMR 9168, Ecole Polytechnique, Institut Polytechnique de Paris, Route de Saclay, 91128 Palaiseau, France
| | - Kevin Cariou
- Chimie ParisTech, PSL University, CNRS, Institute of Chemistry for Life and Health Sciences, Laboratory for Inorganic Chemical Biology, 75005 Paris, France
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29
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Lei J, Sha W, Xie X, Weng WT. Copper-Catalyzed C(sp)-H Bond Hydrazidation. Org Lett 2023; 25:320-324. [PMID: 36594742 DOI: 10.1021/acs.orglett.2c03876] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
A catalytic, direct synthetic strategy for preparing ynehydrazides with terminal alkynes and dialkyl azodicarboxylates is described. The protocol utilizes a cheap copper catalyst in combination with a catalytic amount of a weak base. The high sustainability, good practicality, broad substrate scope, and wide functional group tolerance comprised the advantages of this reaction. Synthetic applications and preliminary mechanistic studies have been conducted.
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Affiliation(s)
- Jian Lei
- College of Chemical Engineering and Materials Science, Quanzhou Normal University, Quanzhou 362000, P. R. China
| | - Wanxiu Sha
- College of Chemical Engineering and Materials Science, Quanzhou Normal University, Quanzhou 362000, P. R. China
| | - Xiaolan Xie
- College of Chemical Engineering and Materials Science, Quanzhou Normal University, Quanzhou 362000, P. R. China
| | - Wen-Ting Weng
- College of Chemical Engineering and Materials Science, Quanzhou Normal University, Quanzhou 362000, P. R. China
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30
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Saxena A, Ghosh N. Sequential Cu(II)-Catalyzed Multicomponent C-N Coupling, Nucleophilic Addition, and Cyclization Cascade: A Diastereoselective Approach to Carboxamide-Embedded Hexahydrobenzofuran Core. J Org Chem 2023; 88:300-309. [PMID: 36571574 DOI: 10.1021/acs.joc.2c02320] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Cascade or domino reactions serve as a powerful technique for the synthesis of complex organic scaffolds in one pot. Herein, a Cu(II)-catalyzed and silica gel-assisted multicomponent reaction (MCR) between bromoalkyne-tethered cyclohexadienones, amides, and water for the construction of hexahydrobenzofuran-3-carboxamide is developed. The reaction proceeds via a C-N coupling reaction followed by hydrative cyclization of ynamide intermediates. Notably, good to excellent diastereoselectivity is complementary of this reaction.
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Affiliation(s)
- Anchal Saxena
- Medicinal & Process Chemistry Division, CSIR-Central Drug Research Institute, Lucknow 226031, Uttar Pradesh, India
| | - Nayan Ghosh
- Medicinal & Process Chemistry Division, CSIR-Central Drug Research Institute, Lucknow 226031, Uttar Pradesh, India.,Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
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31
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Kawakami R, Usui S, Tada N, Itoh A. Late-stage diversification strategy for synthesizing ynamides through copper-catalyzed diynylation and azide-alkyne cycloaddition. Chem Commun (Camb) 2023; 59:450-453. [PMID: 36519388 DOI: 10.1039/d2cc05575a] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
A late-stage diversification strategy for synthesizing ynamides has been developed. This strategy was enabled by the copper-catalyzed direct electrophilic diynylation of sulfonamides with a novel triisopropylsilyl diynyl benziodoxolone, deprotection, and the late-stage chemoselective copper-catalyzed azide-alkyne cycloaddition sequence, which yields various complex molecule-derived ynamides with pyrene, amino acid, nucleoside, and N-acetylglucosamine as substituents.
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Affiliation(s)
- Ryohei Kawakami
- Laboratory of Pharmaceutical Synthetic Chemistry, Faculty of Pharmaceutical Science, Gifu Pharmaceutical University, 1-25-4 Daigaku-nishi, Gifu, 501-1196, Japan.
| | - Suguru Usui
- Laboratory of Pharmaceutical Synthetic Chemistry, Faculty of Pharmaceutical Science, Gifu Pharmaceutical University, 1-25-4 Daigaku-nishi, Gifu, 501-1196, Japan.
| | - Norihiro Tada
- Laboratory of Pharmaceutical Synthetic Chemistry, Faculty of Pharmaceutical Science, Gifu Pharmaceutical University, 1-25-4 Daigaku-nishi, Gifu, 501-1196, Japan.
| | - Akichika Itoh
- Laboratory of Pharmaceutical Synthetic Chemistry, Faculty of Pharmaceutical Science, Gifu Pharmaceutical University, 1-25-4 Daigaku-nishi, Gifu, 501-1196, Japan.
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32
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Iftikhar R, Mazhar A, Iqbal MS, Khan FZ, Askary SH, Sibtain H. Ring forming transformations of ynamides via cycloaddition. RSC Adv 2023; 13:10715-10756. [PMID: 37025669 PMCID: PMC10072253 DOI: 10.1039/d3ra00139c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2023] [Accepted: 03/29/2023] [Indexed: 04/07/2023] Open
Abstract
Ynamides are N-alkyne compounds bearing an electron withdrawing group at the nitrogen atom. They offer unique pathways for the construction of versatile building blocks owing to their exceptional balance between reactivity and stability. Recently several studies have been reported that explore and illustrate the synthetic potential of ynamides and ynamide-derived advanced intermediates in cycloadditions with different reaction partners to yield heterocyclic cycloadducts of synthetic and pharmaceutical value. Cycloaddition reactions of ynamides are the facile and preferable routes for the construction of structural motifs having striking importance in synthetic, medicinal chemistry, and advanced materials. In this systematic review, we highlighted the recently reported novel transformations and synthetic applications that involved the cycloaddition reaction of ynamides. The scope along with the limitations of the transformations are discussed in detail. Synthetic potential of ynamides and ynamide-derived advanced intermediates in cycloaddition reactions with different reaction partners to yield versatile heterocyclic adducts.![]()
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Affiliation(s)
- Ramsha Iftikhar
- Department of Chemistry, Government College University Faisalabad38000-FaisalabadPakistan
| | - Aqsa Mazhar
- Faculty of Health and Medicine, University of New South Wales2033-SydneyAustralia
| | - Muhammad Saqlain Iqbal
- Department of Electrical Information Engineering, Polytechnic University of Bari70126-BariItaly
| | - Faiza Zahid Khan
- Institute of Chemistry, RheinischeFriedrich-Wilhelms-Universität BonnBonnGermany
| | - Syed Hassan Askary
- Department of Chemistry, University of Management and Technology54770-LahorePakistan
| | - Hifza Sibtain
- Department of Chemistry, University of Management and Technology54770-LahorePakistan
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33
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Sau S, Ghosh A, Shankar M, Gogoi MP, Sahoo AK. Cobalt-Catalyzed Thioamide Directed C(arene)-H Annulation with Ynamide: Regioselective Access to 2-Amidoindenones. Org Lett 2022; 24:9508-9513. [PMID: 36538762 DOI: 10.1021/acs.orglett.2c03989] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Demonstrated herein is an unprecedented thioamide-directed cobalt (Co)-catalyzed umpolung annulation of sulfoximines enabled aryl thioamide with ynamide for the synthesis of highly substituted 2-amidoindenones. The cyclization is regioselective, making β-C-C and α-C-CO bonds. The transformation is even successful on a gram scale, exhibiting broad scope with labile functional group tolerance and constructing 43 unusual 2-amidoindenones of structural diversity. Control experiments and mechanistic investigation validate the regioselectivity outcome in this transformation.
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Affiliation(s)
- Somratan Sau
- School of Chemistry, University of Hyderabad, Hyderabad 500046, India
| | - Arghadip Ghosh
- School of Chemistry, University of Hyderabad, Hyderabad 500046, India
| | - Majji Shankar
- School of Chemistry, University of Hyderabad, Hyderabad 500046, India
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34
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Lu MZ, Goh J, Maraswami M, Jia Z, Tian JS, Loh TP. Recent Advances in Alkenyl sp 2 C-H and C-F Bond Functionalizations: Scope, Mechanism, and Applications. Chem Rev 2022; 122:17479-17646. [PMID: 36240299 DOI: 10.1021/acs.chemrev.2c00032] [Citation(s) in RCA: 44] [Impact Index Per Article: 22.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
Alkenes and their derivatives are featured widely in a variety of natural products, pharmaceuticals, and advanced materials. Significant efforts have been made toward the development of new and practical methods to access this important class of compounds by selectively activating the alkenyl C(sp2)-H bonds in recent years. In this comprehensive review, we describe the state-of-the-art strategies for the direct functionalization of alkenyl sp2 C-H and C-F bonds until June 2022. Moreover, metal-free, photoredox, and electrochemical strategies are also covered. For clarity, this review has been divided into two parts; the first part focuses on currently available alkenyl sp2 C-H functionalization methods using different alkene derivatives as the starting materials, and the second part describes the alkenyl sp2 C-F bond functionalization using easily accessible gem-difluoroalkenes as the starting material. This review includes the scope, limitations, mechanistic studies, stereoselective control (using directing groups as well as metal-migration strategies), and their applications to complex molecule synthesis where appropriate. Overall, this comprehensive review aims to document the considerable advancements, current status, and emerging work by critically summarizing the contributions of researchers working in this fascinating area and is expected to stimulate novel, innovative, and broadly applicable strategies for alkenyl sp2 C-H and C-F bond functionalizations in the coming years.
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Affiliation(s)
- Ming-Zhu Lu
- College of Advanced Interdisciplinary Science and Technology, Henan University of Technology, Zhengzhou 450001, China.,School of Chemistry, Chemical Engineering and Biotechnology, Nanyang Technological University, Singapore 637371, Singapore
| | - Jeffrey Goh
- School of Chemistry, Chemical Engineering and Biotechnology, Nanyang Technological University, Singapore 637371, Singapore
| | - Manikantha Maraswami
- School of Chemistry, Chemical Engineering and Biotechnology, Nanyang Technological University, Singapore 637371, Singapore
| | - Zhenhua Jia
- Institute of Advanced Synthesis, School of Chemistry and Molecular Engineering, Nanjing Tech University, Nanjing 211816, China
| | - Jie-Sheng Tian
- School of Chemistry and Chemical Engineering, Northwestern Polytechnical University, Xi'an 710072, China
| | - Teck-Peng Loh
- College of Advanced Interdisciplinary Science and Technology, Henan University of Technology, Zhengzhou 450001, China.,School of Chemistry, Chemical Engineering and Biotechnology, Nanyang Technological University, Singapore 637371, Singapore.,Institute of Advanced Synthesis, School of Chemistry and Molecular Engineering, Nanjing Tech University, Nanjing 211816, China
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35
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Bormann CT, Mathew C, António MM, Trotti A, Fadaei-Tirani F, Severin K. Synthesis and Reactivity of a Terminal 1-Alkynyl Triazene. J Org Chem 2022; 87:16882-16886. [PMID: 36459616 DOI: 10.1021/acs.joc.2c02121] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/04/2022]
Abstract
1-Alkynyl triazenes are versatile reagents in synthetic organic chemistry, but the structural diversity of this compound class has so far been limited. Herein, we describe the synthesis of a terminal 1-alkynyl triazene. Subsequent functionalization allows the preparation of 1-alkynyl triazenes with a range of functional groups including esters, alcohols, cyanides, phosphonates, and amides. Furthermore, the terminal 1-alkynyl triazene can be used for the synthesis of di- and triynes and for the preparation of (hetero)aromatic triazenes in metal-catalyzed cyclization reactions.
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Affiliation(s)
- Carl T Bormann
- Institute of Chemical Sciences and Engineering, École Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
| | - Christeena Mathew
- Institute of Chemical Sciences and Engineering, École Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
| | - Margarida M António
- Institute of Chemical Sciences and Engineering, École Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
| | - Aude Trotti
- Institute of Chemical Sciences and Engineering, École Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
| | - Farzaneh Fadaei-Tirani
- Institute of Chemical Sciences and Engineering, École Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
| | - Kay Severin
- Institute of Chemical Sciences and Engineering, École Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
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36
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Golling S, Hansjacob P, Bami N, Leroux FR, Donnard M. Direct Access to 2,3-Disubstituted Amido-Indenones through Annulation of 2-Iodobenzaldehydes with Ynamides. J Org Chem 2022; 87:16860-16866. [PMID: 36472915 DOI: 10.1021/acs.joc.2c02054] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
In this paper we report the annulation reaction between 2-iodobenzaldehyde derivatives and various ynamides. This palladium-catalyzed reaction leads to rare polysubstituted amino-indenones in good yields with a regioselectivity up to complete. Remarkably, a regiodivergent selectivity has been identified between aryl and alkyl or silyl ynamides, with the first leading mainly to 2-amido-indenones and the second to 3-amido-indenones.
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Affiliation(s)
- Stéphane Golling
- CNRS, UMR 7042-LIMA, ECPM, Université de Strasbourg, Université de Haute-Alsace, F-67000 Strasbourg, France
| | - Pierre Hansjacob
- CNRS, UMR 7042-LIMA, ECPM, Université de Strasbourg, Université de Haute-Alsace, F-67000 Strasbourg, France
| | - Nassim Bami
- CNRS, UMR 7042-LIMA, ECPM, Université de Strasbourg, Université de Haute-Alsace, F-67000 Strasbourg, France
| | - Frédéric R Leroux
- CNRS, UMR 7042-LIMA, ECPM, Université de Strasbourg, Université de Haute-Alsace, F-67000 Strasbourg, France
| | - Morgan Donnard
- CNRS, UMR 7042-LIMA, ECPM, Université de Strasbourg, Université de Haute-Alsace, F-67000 Strasbourg, France
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37
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Jos S, Tan C, Thilmany P, Saadane A, Slebodnick C, Evano G, Santos WL. Phosphine-catalyzed regio- and stereo-selective hydroboration of ynamides to ( Z)-β-borylenamides. Chem Commun (Camb) 2022; 58:13751-13754. [PMID: 36416159 DOI: 10.1039/d2cc04543e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
We report a tri-n-butyl phosphine catalyzed regio- and stereo-selective hydroboration of ynamides to yield (Z)-β-borylenamides in good yields. Surprisingly, a formal cis addition to the triple bond was observed as confirmed by NMR and X-ray crystallography. 31P NMR studies suggest that a zwitterionic vinylphosphonium intermediate is key in the mechanism. The resulting products were further transformed to β-CF3 enamides via stereoretentive trifluoromethylation.
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Affiliation(s)
- Swetha Jos
- Department of Chemistry, Virginia Tech, Blacksburg, Virginia, USA.
| | - Christine Tan
- Department of Chemistry, Virginia Tech, Blacksburg, Virginia, USA.
| | - Pierre Thilmany
- Laboratoire de Chimie Organique, Service de Chimie et PhysicoChimie Organiques, Université libre de Bruxelles, Avenue F. D. Roosevelt 50, CP160/06, 1050 Brussels, Belgium
| | - Alaâ Saadane
- Laboratoire de Chimie Organique, Service de Chimie et PhysicoChimie Organiques, Université libre de Bruxelles, Avenue F. D. Roosevelt 50, CP160/06, 1050 Brussels, Belgium
| | - Carla Slebodnick
- Department of Chemistry, Virginia Tech, Blacksburg, Virginia, USA.
| | - Gwilherm Evano
- Laboratoire de Chimie Organique, Service de Chimie et PhysicoChimie Organiques, Université libre de Bruxelles, Avenue F. D. Roosevelt 50, CP160/06, 1050 Brussels, Belgium
| | - Webster L Santos
- Department of Chemistry, Virginia Tech, Blacksburg, Virginia, USA.
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38
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Körner L, Ho LP, Puchta R, Stanger A, Tamm M. Dimorpholinoacetylene and Its Use for the Synthesis of Tetraaminocyclobutadiene Species. Chemistry 2022; 28:e202202737. [PMID: 36148808 PMCID: PMC9828195 DOI: 10.1002/chem.202202737] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2022] [Indexed: 01/12/2023]
Abstract
The new diaminoacetylene (DAA) dimorpholinoacetylene (3) was prepared from 1,1-dimorpholinoethene (1) by bromination to form the dibromoketene aminal 2, which upon lithiation afforded 3 through a Fritsch-Buttenberg-Wiechell rearrangement. Heating 3 at elevated temperatures resulted in a complete conversion into the dimer 1,1,2,4-tetramorpholino-1-buten-3-yne (4), which was used for the synthesis of four-membered cyclic bent allene (CBA) transition-metal complexes of the type [(CBA)MLn ] (5-7; MLn =AuCl, RhCl(COD), RhCl(CO)2 ; CBA=1,3,4,4-tetramorpholino-1,2-cyclobutadiene; COD=1,5-cyclooctadiene). The reaction of 3 with tetraethylammonium bromide gave 1,2,3,4-tetramorpholinocyclobutenylium bromide (8), which reacted with bromine to form 1,2,3,4-tetra(morpholino)cyclobutenediylium bis(tribromide) (9). Compound 9 represents the first fully characterized compound containing a tetraaminocyclobutadiene dication and displays a nearly planar C4 N4 core as shown by X-ray diffraction analysis. Detailed quantum chemical calculations were performed to assess the aromaticity of tetraaminocyclubutadiene dications by employing the Nucleus Independent Chemical Shift (NICS) method and current density analysis.
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Affiliation(s)
- Lukas Körner
- Institut für Anorganische und Analytische ChemieTechnische Universität BraunschweigHagenring 3038106BraunschweigGermany
| | - Luong Phong Ho
- Institut für Anorganische und Analytische ChemieTechnische Universität BraunschweigHagenring 3038106BraunschweigGermany
| | - Ralph Puchta
- Department Chemie und PharmazieFriedrich-Alexander Universität Erlangen-NürnbergEgerlandstr. 191058ErlangenGermany
| | - Amnon Stanger
- Schulich Department of Chemistry, TechnionHaifa32000Israel
| | - Matthias Tamm
- Institut für Anorganische und Analytische ChemieTechnische Universität BraunschweigHagenring 3038106BraunschweigGermany
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39
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Kanikarapu S, Gogoi MP, Dutta S, Sahoo AK. A 6- endo-dig Thiolative Cyclization of Yne-Ynamides: Access to Thiodihydropyridin-2-ones. Org Lett 2022; 24:8289-8294. [DOI: 10.1021/acs.orglett.2c03225] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Suresh Kanikarapu
- School of Chemistry, University of Hyderabad, Hyderabad, India 500046
| | | | - Shubham Dutta
- School of Chemistry, University of Hyderabad, Hyderabad, India 500046
| | - Akhila K. Sahoo
- School of Chemistry, University of Hyderabad, Hyderabad, India 500046
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40
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Jiao L, Wang Y, Ding L, Zhang C, Wang XN, Chang J. Synthesis of 2-Aminopyrroles Via Metal-Free Annulation of Ynamides with 2 H-Azirines. J Org Chem 2022; 87:15564-15570. [DOI: 10.1021/acs.joc.2c02103] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Lianhong Jiao
- Collaborative Innovation Center of New Drug Research and Safety Evaluation, Henan Province, Key Laboratory of Advanced Drug Preparation Technologies, Ministry of Education, School of Pharmaceutical Sciences, Zhengzhou University, Zhengzhou 450001, P. R. China
| | - Yanan Wang
- Collaborative Innovation Center of New Drug Research and Safety Evaluation, Henan Province, Key Laboratory of Advanced Drug Preparation Technologies, Ministry of Education, School of Pharmaceutical Sciences, Zhengzhou University, Zhengzhou 450001, P. R. China
| | - Lixia Ding
- Collaborative Innovation Center of New Drug Research and Safety Evaluation, Henan Province, Key Laboratory of Advanced Drug Preparation Technologies, Ministry of Education, School of Pharmaceutical Sciences, Zhengzhou University, Zhengzhou 450001, P. R. China
| | - Chaofeng Zhang
- Collaborative Innovation Center of New Drug Research and Safety Evaluation, Henan Province, Key Laboratory of Advanced Drug Preparation Technologies, Ministry of Education, School of Pharmaceutical Sciences, Zhengzhou University, Zhengzhou 450001, P. R. China
| | - Xiao-Na Wang
- Collaborative Innovation Center of New Drug Research and Safety Evaluation, Henan Province, Key Laboratory of Advanced Drug Preparation Technologies, Ministry of Education, School of Pharmaceutical Sciences, Zhengzhou University, Zhengzhou 450001, P. R. China
| | - Junbiao Chang
- Collaborative Innovation Center of New Drug Research and Safety Evaluation, Henan Province, Key Laboratory of Advanced Drug Preparation Technologies, Ministry of Education, School of Pharmaceutical Sciences, Zhengzhou University, Zhengzhou 450001, P. R. China
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41
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Zeng J, Li J, Huang B, Li J, Cai M. A practical access to 1,2-dicarbonyls via oxidation of alkynes catalyzed by gold(I) immobilized on MCM-41. J Organomet Chem 2022. [DOI: 10.1016/j.jorganchem.2022.122435] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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42
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Le Du E, Borrel J, Waser J. Copper-Catalyzed Alkynylation of Hydrazides: An Easy Access to Functionalized Azadipeptides. Org Lett 2022; 24:6614-6618. [PMID: 36066898 DOI: 10.1021/acs.orglett.2c02625] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
We report a copper-catalyzed alkynylation of azadipeptides using ethynylbenziodoxolone (EBX) reagents. Nonsymmetrical ynehydrazides could be obtained in 25-97% yield using azaglycine derivatives as nucleophiles. The transformation is compatible with most functional groups naturally occurring on amino acid side chains and allows the transfer of silyl-, alkyl-, and aryl-substituted alkynes. The obtained α-alkynyl azaglycine products could be further functionalized by nucleophilic attack or cycloaddition on the triple bond.
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Affiliation(s)
- Eliott Le Du
- Laboratory of Catalysis and Organic Synthesis, Institute of Chemical Sciences and Engineering, Ecole Polytechnique Fédérale de Lausanne, EPFL SB ISIC LCSO, BCH 4306, 1015 Lausanne, Switzerland
| | - Julien Borrel
- Laboratory of Catalysis and Organic Synthesis, Institute of Chemical Sciences and Engineering, Ecole Polytechnique Fédérale de Lausanne, EPFL SB ISIC LCSO, BCH 4306, 1015 Lausanne, Switzerland
| | - Jerome Waser
- Laboratory of Catalysis and Organic Synthesis, Institute of Chemical Sciences and Engineering, Ecole Polytechnique Fédérale de Lausanne, EPFL SB ISIC LCSO, BCH 4306, 1015 Lausanne, Switzerland
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43
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Wang K, Yu Q, Mao W, Zheng Y, Xu J, Wang Y. Copper-catalyzed radical trans-selective hydroboration of ynamides with N-heterocyclic carbene boranes. iScience 2022; 25:104977. [PMID: 36065185 PMCID: PMC9440302 DOI: 10.1016/j.isci.2022.104977] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2022] [Revised: 08/05/2022] [Accepted: 08/15/2022] [Indexed: 11/16/2022] Open
Abstract
Vinylboron compounds are important compounds in organic chemistry and biology. In this communication, we developed a copper(I)-catalyzed, highly regio- and stereoselective radical trans-hydroboration of ynamides with N-heterocyclic carbene (NHC)-ligated borane is reported, which leads to a series of trans-boryl enmides that can be conveniently transformed into various multi-substituted enamides. Further investigation showcased that our method is robust and scalable. The mechanism of this unique reaction is studied and discussed. A Cu-catalyzed highly regio- and stereoselective radical trans-hydroboration of ynamides Good to excellent yields, good functional group tolerance Further investigation showcased that our method is robust and scalable
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Affiliation(s)
- Kefeng Wang
- Department of Pharmacology, School of Medicine, Southern University of Science and Technology, Shenzhen 518055, China
| | - Qingzhen Yu
- Clinical Medical Research Center, Southern University of Science and Technology Hospital, Shenzhen 518055, China
| | - Wenli Mao
- Department of Pharmacology, School of Medicine, Southern University of Science and Technology, Shenzhen 518055, China
| | - Yuxin Zheng
- Department of Pharmacology, School of Medicine, Southern University of Science and Technology, Shenzhen 518055, China
| | - Jing Xu
- Department of Chemistry and Shenzhen Grubbs Institute and Guangdong Provincial Key Laboratory of Catalysis and Shenzhen Key Laboratory of Small Molecule Drug Discovery and Synthesis, Southern University of Science and Technology, Shenzhen 518055, China
- Corresponding author
| | - Yukun Wang
- Department of Pharmacology, School of Medicine, Southern University of Science and Technology, Shenzhen 518055, China
- Department of Pharmacy, Southern University of Science and Technology Hospital, Shenzhen 518055, China
- Corresponding author
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Yadav B, Baire B. Ag(I)-Promoted, Diastereoselective Cyclo-isomerization of N-Alkynyl-7-azaindole-2-carbinols. Selective Synthesis of syn-1,2-Diarylpyrrolo[1,2- a]indol-3-ones and ( Z)-8-Benzylideneoxazolo[3',4'':1,5]pyrrolo[2,3- b]pyridines. Org Lett 2022; 24:5450-5455. [PMID: 35834489 DOI: 10.1021/acs.orglett.2c02179] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The design and development of an Ag(I)-promoted, highly diastereoselective cycloisomerization strategy for the synthesis of syn-1,2-diarylpyrrolo[1,2-a]indol-3-ones from N-alkynyl-indole-2-carbinols is reported. The H218O control experiment and identification of 18O-labeled product suggested the involvement of an external water. The 7-azaindole substrates showned a distinct reactivity to give the (Z)-8-benzylideneoxazolo[3',4':1,5]pyrrolo[2,3-b]pyridines. Key features of this strategy are its 100% atom economy, access to important heterocycles, diverse substrate scope, yields up to 95%, operationally simple procedure, and distinct reactivity of indole vs 7-azaindoles.
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Affiliation(s)
- Bhavna Yadav
- Indian Institute of Technology Madras, Chennai 600036, Tamil Nadu, India
| | - Beeraiah Baire
- Indian Institute of Technology Madras, Chennai 600036, Tamil Nadu, India
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45
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Wang Y, Hu M, Ding L, Wang Y, Wang XN, Chang J. [2 + 2] Cycloaddition of Ynamides to Construct 3-Aminocyclobutenones. Org Lett 2022; 24:5056-5061. [PMID: 35816096 DOI: 10.1021/acs.orglett.2c01825] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
An efficient Tf2NH-catalyzed [2 + 2] cycloaddition of ynamides under mild conditions has been developed. Within short reaction times, various ynamides are transformed into the corresponding 3-aminocyclobutenones in good to excellent yields. This is the first example for the metal-free intermolecular [2 + 2] self-cycloaddition of ynamides. Meanwhile, the desired cycloaddition products can be easily transformed into aminonaphthol derivatives.
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Affiliation(s)
- Yanru Wang
- Collaborative Innovation Center of New Drug Research and Safety Evaluation, Henan Province, Key Laboratory of Advanced Drug Preparation Technologies, Ministry of Education, School of Pharmaceutical Sciences, Zhengzhou University, Zhengzhou, Henan 450001, P.R. China
| | - Mengjun Hu
- Collaborative Innovation Center of New Drug Research and Safety Evaluation, Henan Province, Key Laboratory of Advanced Drug Preparation Technologies, Ministry of Education, School of Pharmaceutical Sciences, Zhengzhou University, Zhengzhou, Henan 450001, P.R. China
| | - Lixia Ding
- Collaborative Innovation Center of New Drug Research and Safety Evaluation, Henan Province, Key Laboratory of Advanced Drug Preparation Technologies, Ministry of Education, School of Pharmaceutical Sciences, Zhengzhou University, Zhengzhou, Henan 450001, P.R. China
| | - Yanan Wang
- Collaborative Innovation Center of New Drug Research and Safety Evaluation, Henan Province, Key Laboratory of Advanced Drug Preparation Technologies, Ministry of Education, School of Pharmaceutical Sciences, Zhengzhou University, Zhengzhou, Henan 450001, P.R. China
| | - Xiao-Na Wang
- Collaborative Innovation Center of New Drug Research and Safety Evaluation, Henan Province, Key Laboratory of Advanced Drug Preparation Technologies, Ministry of Education, School of Pharmaceutical Sciences, Zhengzhou University, Zhengzhou, Henan 450001, P.R. China
| | - Junbiao Chang
- Collaborative Innovation Center of New Drug Research and Safety Evaluation, Henan Province, Key Laboratory of Advanced Drug Preparation Technologies, Ministry of Education, School of Pharmaceutical Sciences, Zhengzhou University, Zhengzhou, Henan 450001, P.R. China
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46
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Wei W, Xu X, Sung HHY, Williams ID, Lin Z, Jia G. Dewar Metallabenzenes from Reactions of Metallacyclobutadienes with Alkynes. Angew Chem Int Ed Engl 2022; 61:e202202886. [DOI: 10.1002/anie.202202886] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2022] [Indexed: 11/08/2022]
Affiliation(s)
- Wei Wei
- Department of Chemistry Hong Kong University of Science and Technology Clear Water Bay, Kowloon Hong Kong China
| | - Xin Xu
- Department of Chemistry Hong Kong University of Science and Technology Clear Water Bay, Kowloon Hong Kong China
| | - Herman H. Y. Sung
- Department of Chemistry Hong Kong University of Science and Technology Clear Water Bay, Kowloon Hong Kong China
| | - Ian D. Williams
- Department of Chemistry Hong Kong University of Science and Technology Clear Water Bay, Kowloon Hong Kong China
| | - Zhenyang Lin
- Department of Chemistry Hong Kong University of Science and Technology Clear Water Bay, Kowloon Hong Kong China
| | - Guochen Jia
- Department of Chemistry Hong Kong University of Science and Technology Clear Water Bay, Kowloon Hong Kong China
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47
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Lin J, Wu C, Tian X. Nickel-Catalyzed Cascade Reaction of 2-Vinylanilines with gem-Dichloroalkenes. Org Lett 2022; 24:4855-4859. [PMID: 35767682 DOI: 10.1021/acs.orglett.2c01492] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
An efficient nickel-catalyzed cascade reaction of 2-vinylanilines with gem-dichloroalkenes has been developed to deliver diversely substituted quinolines in good to high yields. This protocol enables effective access to quinolines bearing various functional groups in the cascade process from readily available feedstock chemicals. Mechanistic studies suggest that two plausible pathways are involved in the IPr-nickel catalytic system.
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Affiliation(s)
- Jin Lin
- Guangzhou Municipal and Guangdong Provincial Key Laboratory of Molecular Target & Clinical Pharmacology, NMPA and State Key Laboratory of Respiratory Disease, School of Pharmaceutical Sciences & Fifth Affiliated Hospital, Guangzhou Medical University, Guangzhou, Guangdong 511436, China
| | - Chaoyi Wu
- Guangzhou Municipal and Guangdong Provincial Key Laboratory of Molecular Target & Clinical Pharmacology, NMPA and State Key Laboratory of Respiratory Disease, School of Pharmaceutical Sciences & Fifth Affiliated Hospital, Guangzhou Medical University, Guangzhou, Guangdong 511436, China
| | - Xu Tian
- Guangzhou Municipal and Guangdong Provincial Key Laboratory of Molecular Target & Clinical Pharmacology, NMPA and State Key Laboratory of Respiratory Disease, School of Pharmaceutical Sciences & Fifth Affiliated Hospital, Guangzhou Medical University, Guangzhou, Guangdong 511436, China
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48
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Okitsu T, Itoh M, Inui A, Muta E, Nakamoto R, Adachi Y, Wada A, Hatano M. Rapid Synthesis of Polycyclic Aromatic Compounds by Iodocyclization of Ynamides. ASIAN J ORG CHEM 2022. [DOI: 10.1002/ajoc.202200275] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Takashi Okitsu
- Kobe Pharmaceutical University Higashinada Kobe 658-8558 Japan
| | - Maho Itoh
- Kobe Pharmaceutical University Higashinada Kobe 658-8558 Japan
| | - Ayaka Inui
- Kobe Pharmaceutical University Higashinada Kobe 658-8558 Japan
| | - Emiko Muta
- Kobe Pharmaceutical University Higashinada Kobe 658-8558 Japan
| | - Ryota Nakamoto
- Kobe Pharmaceutical University Higashinada Kobe 658-8558 Japan
| | - Yuta Adachi
- Kobe Pharmaceutical University Higashinada Kobe 658-8558 Japan
| | - Akimori Wada
- Kobe Pharmaceutical University Higashinada Kobe 658-8558 Japan
| | - Manabu Hatano
- Kobe Pharmaceutical University Higashinada Kobe 658-8558 Japan
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49
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Yamaoka Y, Yamasaki D, Kajiwara D, Shinozaki M, Yamada KI, Takasu K. Lewis Acid-Catalyzed Diastereoselective Domino Reaction of Ene-Ynamide with Trimethylsilyl Cyanide to Construct Spiroindolines. Org Lett 2022; 24:4389-4393. [PMID: 35687516 DOI: 10.1021/acs.orglett.2c01607] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The Zn(OTf)2-catalyzed domino reaction of enamide-ynamides in the presence of trimethylsilyl cyanide as an external nucleophile to construct spirocyclic indolines was developed. This domino reaction involved cyclization of enamide to ynamide to generate 4',5'-dihydrospiro[indoline-3,3'-pyrrol]-1'-ium followed by cyanide addition to produce spiroindolopyrrolidines with good diastereoselectivity.
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Affiliation(s)
- Yousuke Yamaoka
- Graduate School of Pharmaceutical Sciences, Kyoto University, Yoshida, Sakyo-ku, Kyoto 606-8501, Japan
| | - Daisuke Yamasaki
- Graduate School of Pharmaceutical Sciences, Kyoto University, Yoshida, Sakyo-ku, Kyoto 606-8501, Japan
| | - Daigo Kajiwara
- Graduate School of Pharmaceutical Sciences, Kyoto University, Yoshida, Sakyo-ku, Kyoto 606-8501, Japan
| | - Makiko Shinozaki
- Graduate School of Pharmaceutical Sciences, Kyoto University, Yoshida, Sakyo-ku, Kyoto 606-8501, Japan
| | - Ken-Ichi Yamada
- Graduate School of Pharmaceutical Sciences, Tokushima University, Shomachi, Tokushima 770-8505, Japan
| | - Kiyosei Takasu
- Graduate School of Pharmaceutical Sciences, Kyoto University, Yoshida, Sakyo-ku, Kyoto 606-8501, Japan
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50
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Fang R, Liu K, Kirillov AM, Yang L. DFT Rationalization of Gold(I)-Catalyzed Couplings between Alkynyl Thioether and Nitrenoid Derivatives: Mechanism, Selectivity Patterns, and Effects of Substituents. J Org Chem 2022; 87:7193-7201. [PMID: 35579210 DOI: 10.1021/acs.joc.2c00407] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The present work focuses on a theoretical investigation of mechanistic features, chemoselectivity, regioselectivity, and effect of substituents in the gold-catalyzed reactions of alkynyl thioethers and isoxazoles. The DFT calculations reveal that the nucleophilic attack of isoxazole to a β-position of catalyst-bound ynamide forms a vinyl intermediate. This undergoes cleavage of the N-O isoxazole bond and isomerizes to form an α-imino α'-sulfenyl gold carbene complex with stabilization of the Au-S interaction. For 3,5-dimethylisoxazole, the reaction follows a formal [3 + 2] cycloaddition pathway and a 1,3-H migration to give the pyrrole products. Replacement of 3,5-dimethylisoxazole by 3,5-dimethyl-4-phenylisoxazole leads to the formation of deacylative annulation products and desulfenylated 3-acylated pyrroles. Reactions with 4-methyl-3,5-diphenylisoxazoles induce the formation of N-acylated pyrroles and desulfenylated 3-acylated pyrroles. For the minor pathway, the α-addition and 1,2-S migration result in sulfur-substituted β-keto enamide derivatives. In addition, the unique features of regio- and chemoselectivity were rationalized by the distortion and interaction analysis. Apart from fully rationalizing the experimental results, the theoretical DFT data give an important support for comprehending related types of reaction mechanisms.
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Affiliation(s)
- Ran Fang
- Key Laboratory of Chemical Additives for China National Light Industry, College of Chemistry and Chemical Engineering, Shaanxi University of Science and Technology, Xi'an 710021, P. R. China
| | - Kunyang Liu
- Key Laboratory of Chemical Additives for China National Light Industry, College of Chemistry and Chemical Engineering, Shaanxi University of Science and Technology, Xi'an 710021, P. R. China
| | - Alexander M Kirillov
- Centro de Química Estrutural, Institute of Molecular Sciences, Departamento de Engenharia Química, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, Lisbon 1049-001, Portugal
| | - Lizi Yang
- College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, P. R. China
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