1
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Li F, Yang Q, Liu MY, An PX, Du YL, Wang YB. Ag(I)-Mediated Annulation of 2-(2-Enynyl)pyridines and Propargyl Amines to Access 1-(2 H-Pyrrol-3-yl)indolizines. J Org Chem 2024; 89:304-312. [PMID: 38126126 DOI: 10.1021/acs.joc.3c02024] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2023]
Abstract
An effective Ag(I)-mediated annulation of 2-(2-enynyl)pyridines and propargyl amines was developed, unexpectedly affording a broad range of functionalized 1-(2H-pyrrol-3-yl)indolizines in moderate to excellent yields. The developed method is characterized by operational simplicity, ready availability of starting materials, high regioselectivity, and broad substrate scope under mild reaction conditions. The Ag(I)-promoted cyclization of 2-(2-enynyl)pyridines and propargyl amines possibly results in the formation of the spiroindolizine, the ring-opening rearrangement of which may give the 1-(2H-pyrrol-3-yl)indolizine. Furthermore, a gram-scale reaction and synthetic transformations are also studied.
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Affiliation(s)
- Feng Li
- College of Chemistry and Molecular Science, Henan University, Kaifeng, Henan 475004, China
| | - Qing Yang
- College of Chemistry and Molecular Science, Henan University, Kaifeng, Henan 475004, China
| | - Ming-Yue Liu
- College of Chemistry and Molecular Science, Henan University, Kaifeng, Henan 475004, China
| | - Pei-Xuan An
- College of Chemistry and Molecular Science, Henan University, Kaifeng, Henan 475004, China
| | - Ya-Long Du
- College of Chemistry and Molecular Science, Henan University, Kaifeng, Henan 475004, China
| | - Yan-Bo Wang
- College of Chemistry and Molecular Science, Henan University, Kaifeng, Henan 475004, China
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2
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Chen LL, Li F, Yang Q, Ye YF, Yang WW, Wang YB. Base-Promoted Decarboxylative Annulation of Methyl 2-(2-Bromophenyl)acetates and Ynones to Access Benzoxepines. J Org Chem 2023. [PMID: 36799925 DOI: 10.1021/acs.joc.2c02870] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/18/2023]
Abstract
A simple and efficient base-mediated decarboxylative annulation of ynones with methyl 2-(2-bromophenyl)acetates has been developed. A broad range of benzoxepines were prepared with a broad substrate scope and high regioselectivity in moderate to excellent yields under transition-metal-free conditions. This method proceeds through a tandem [2 + 4] annulation, ring-opening decarboxylative reaction, and the intramolecular nucleophilic aromatic substitution reaction. Additionally, the key intermediates were successfully obtained and characterized unambiguously by single-crystal X-ray crystallography, which could favorably support a decarboxylative annulation mechanism. Furthermore, gram-scale reaction and synthetic applications for the further functionalization are also studied.
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Affiliation(s)
- Lu-Lu Chen
- Henan Engineering Research Center of Functional Materials and Catalytic Reaction, College of Chemistry and Chemical Engineering, Henan University, Kaifeng 475004, China
| | - Feng Li
- Henan Engineering Research Center of Functional Materials and Catalytic Reaction, College of Chemistry and Chemical Engineering, Henan University, Kaifeng 475004, China
| | - Qing Yang
- Henan Engineering Research Center of Functional Materials and Catalytic Reaction, College of Chemistry and Chemical Engineering, Henan University, Kaifeng 475004, China
| | - Ya-Fang Ye
- Henan Engineering Research Center of Functional Materials and Catalytic Reaction, College of Chemistry and Chemical Engineering, Henan University, Kaifeng 475004, China
| | - Wan-Wan Yang
- Henan Engineering Research Center of Functional Materials and Catalytic Reaction, College of Chemistry and Chemical Engineering, Henan University, Kaifeng 475004, China
| | - Yan-Bo Wang
- Henan Engineering Research Center of Functional Materials and Catalytic Reaction, College of Chemistry and Chemical Engineering, Henan University, Kaifeng 475004, China
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3
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Prakash M, Samanta S. Base-promoted cyclization of ortho-hydroxyacetophenones with in situ generated cyclopropenes: diastereoselective access to spirobenzo[ b]oxepines and related precursors. Org Biomol Chem 2023; 21:2001-2014. [PMID: 36789745 DOI: 10.1039/d3ob00077j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
An unprecedented [5 + 2] spirocyclization route to obtain a vital class of functionalized spirobenzo[b]oxepine-cyclopropanes in good to high yields with excellent diastereoselectivities is reported. This domino reaction proceeds through a regioselective oxa-Michael addition of ortho-hydroxyacetophenones as 1,5-binucleophiles to in situ produced highly reactive cyclopropenes from 2-aroyl-1-chlorocyclopropanecarboxylates triggered by Cs2CO3 and the subsequent intramolecular aldol reaction under heating conditions, enabling the formation of new C-O and C-C bonds for benzo[b]oxepine ring synthesis. Moreover, at ambient temperature, the above C-O/C-C bond-forming event takes place preferentially via a [4 + 2] annulation path over a spirocyclization route, leading to substituted fused-cyclopropanes with good diastereoselectivities. Gratifyingly, further alterations of the obtained spirobenzo[b]oxepines and tetrahydrocyclopropa[b]chromenes afford fascinating classes of 4H-chromen-4-ones and cyclopenta[c]chromenes, respectively, under metal-free conditions.
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Affiliation(s)
- Meher Prakash
- Indian Institute of Technology Indore, Discipline of Chemistry, 453552, Indore, India.
| | - Sampak Samanta
- Indian Institute of Technology Indore, Discipline of Chemistry, 453552, Indore, India.
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4
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Jiang Y, Wang B, Liu D, Xia D, Liu Z, Li L, Deng G, Yang X. Aryl acrylonitriles synthesis enabled by palladium-catalyzed α-alkenylation of arylacetonitriles with vinyl halides/triflates. Front Chem 2022; 10:1091566. [PMID: 36590282 PMCID: PMC9798101 DOI: 10.3389/fchem.2022.1091566] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2022] [Accepted: 12/05/2022] [Indexed: 12/23/2022] Open
Abstract
Aryl acrylonitriles are an important subclass of acrylonitriles in the medicinal chemistry and pharmaceutical industry. Herein, an efficient synthesis of aryl acrylonitrile derivatives using a Palladium/NIXANTPHOS-based catalyst system was developed. This approach furnishes a variety of substituted and functionalized aryl acrylonitriles (up to 95% yield). The scalability of the transformation and the synthetic versatility of aryl acrylonitrile were demonstrated.
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5
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Ye YF, Li F, Chen JL, An ZQ, Zhang GY, Wang YB. Transition-Metal-Free Synthesis of 3-Acyl Chromones by the Tandem Reaction of Ynones and Methyl Salicylates. J Org Chem 2022; 87:14005-14015. [PMID: 36210518 DOI: 10.1021/acs.joc.2c01637] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
A facile and effective tandem reaction of ynones and methyl salicylates was developed to obtain a broad range of 3-acyl chromones in moderate-to-excellent yields. This protocol underwent a Michael addition and cyclization process, which exhibited easily accessible substrates, broad substrate scope, and high regioselectivity under mild and transition-metal-free conditions. Moreover, gram-scale reaction and further chemical transformation of the products were also further studied.
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Affiliation(s)
- Ya-Fang Ye
- Henan Engineering Research Center of Functional Materials and Catalytic Reaction, College of Chemistry and Chemical Engineering, Henan University, Kaifeng 475004, China
| | - Feng Li
- Henan Engineering Research Center of Functional Materials and Catalytic Reaction, College of Chemistry and Chemical Engineering, Henan University, Kaifeng 475004, China
| | - Jia-Le Chen
- Henan Engineering Research Center of Functional Materials and Catalytic Reaction, College of Chemistry and Chemical Engineering, Henan University, Kaifeng 475004, China
| | - Zi-Qian An
- Henan Engineering Research Center of Functional Materials and Catalytic Reaction, College of Chemistry and Chemical Engineering, Henan University, Kaifeng 475004, China
| | - Gui-Ying Zhang
- Henan Engineering Research Center of Functional Materials and Catalytic Reaction, College of Chemistry and Chemical Engineering, Henan University, Kaifeng 475004, China
| | - Yan-Bo Wang
- Henan Engineering Research Center of Functional Materials and Catalytic Reaction, College of Chemistry and Chemical Engineering, Henan University, Kaifeng 475004, China
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6
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Ye YF, Zhang HY, Li F, Yang WW, Luo BP, Wang YB. Base-Promoted Divergent Annulation of Conjugated Ynones and Methyl 2-(Cyanomethyl)benzoates to Access 1-Naphthols and Xanthones. J Org Chem 2022; 87:12132-12147. [PMID: 36062305 DOI: 10.1021/acs.joc.2c01282] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
A facile and efficient base-mediated divergent annulation of methyl 2-(cyanomethyl)benzoates and conjugated ynones has been described. A broad range of 1-naphthols and xanthones were formed in moderate to excellent yields. The notable features of this protocol include readily available precursors, broad substrate scope, complete regioselectivity, and substrate-controlled divergent synthesis. The gram-scale preparation and synthetic transformations of the resulting 1-naphthols and xanthones demonstrate their utility.
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Affiliation(s)
- Ya-Fang Ye
- Henan Engineering Research Center of Functional Materials and Catalytic Reaction, College of Chemistry and Chemical Engineering, Henan University, Kaifeng 475004, China
| | - Hui-Ying Zhang
- Henan Engineering Research Center of Functional Materials and Catalytic Reaction, College of Chemistry and Chemical Engineering, Henan University, Kaifeng 475004, China
| | - Feng Li
- Henan Engineering Research Center of Functional Materials and Catalytic Reaction, College of Chemistry and Chemical Engineering, Henan University, Kaifeng 475004, China
| | - Wan-Wan Yang
- Henan Engineering Research Center of Functional Materials and Catalytic Reaction, College of Chemistry and Chemical Engineering, Henan University, Kaifeng 475004, China
| | - Ben-Pu Luo
- Henan Engineering Research Center of Functional Materials and Catalytic Reaction, College of Chemistry and Chemical Engineering, Henan University, Kaifeng 475004, China
| | - Yan-Bo Wang
- Henan Engineering Research Center of Functional Materials and Catalytic Reaction, College of Chemistry and Chemical Engineering, Henan University, Kaifeng 475004, China
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7
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Wang ZJ, Zheng Y, Tang K, Guan JP, Ye ZP, He JT, Xiao JA, Chen K, Xiang HY, Yang H. Photoinduced Construction of a Benzothienopyridine- S,S-dioxide Framework Enabled by Polychloropyridyl Multifunctional Motifs. J Org Chem 2022; 87:4732-4741. [PMID: 35317557 DOI: 10.1021/acs.joc.2c00029] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Reported herein is a visible-light-induced, catalyst-free intramolecular cyclization of 4-phenylsulfonyl-2,3,5,6-tetrachloropyridine, leading to rapid assembly of a series of unprecedented benzo[4,5]thieno[3,2-c]pyridine 5,5-dioxide scaffolds under mild conditions. The rational introduction of a perchloropyridin-4-yl module significantly facilitated this photoinduced process and offers a versatile platform for broad structural variation. Mechanistic studies revealed that a newly identified charge-transfer complex with carbonate is crucial to this photoinduced process.
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Affiliation(s)
- Zhu-Jun Wang
- College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, P. R. China
| | - Yu Zheng
- College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, P. R. China
| | - Kai Tang
- College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, P. R. China
| | - Jian-Ping Guan
- College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, P. R. China
| | - Zhi-Peng Ye
- College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, P. R. China
| | - Jun-Tao He
- College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, P. R. China
| | - Jun-An Xiao
- Guangxi Key Laboratory of Natural Polymer Chemistry and Physics, Nanning Normal University, Nanning 530001, P. R. China
| | - Kai Chen
- College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, P. R. China
| | - Hao-Yue Xiang
- College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, P. R. China.,School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang, Henan 453007, P. R. China
| | - Hua Yang
- College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, P. R. China
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8
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Lu N, Liang H, Miao C, Lan X. Theoretical Investigation on the Mechanism and Selectivity of Catalyst-Free Annulation of Ynediones and (Iso)quinoline N-Oxides. HETEROCYCLES 2022. [DOI: 10.3987/com-21-14590] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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9
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Ghosh A, Hegde RV, Rode HB, Ambre R, Mane MV, Patil SA, Sridhar B, Dateer RB. Catalyst- and Additive-Free Approach to Constructing Benzo-oxazine, Benzo-oxazepine, and Benzo-oxazocine: O Atom Transfer and C═O, C-N, and C-O Bond Formation at Room Temperature. Org Lett 2021; 23:8189-8193. [PMID: 34643397 DOI: 10.1021/acs.orglett.1c02895] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
An exclusive synthesis of benzo-oxazine, benzo-oxazepine, and benzo-oxazocine from aryl propanal and 2-(hydroxyamino)phenyl alcohol under metal-free conditions is described. O atom transfer and formation of new C═O, C-N, and C-O bonds occur at room temperature to form six-, seven-, and eight-membered heterocycles under one-pot reaction conditions without using an external oxidant and base. The photophysical properties are studied using ultraviolet-visible absorption and photoluminescence. The mechanistic elucidation is well supported by control experiment and literature precedents.
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Affiliation(s)
- Arnab Ghosh
- Centre for Nano and Material Sciences, Jain University, Jain Global Campus, Bangalore, Karnataka 562112, India
| | - Rajeev V Hegde
- Centre for Nano and Material Sciences, Jain University, Jain Global Campus, Bangalore, Karnataka 562112, India
| | - Haridas B Rode
- Department of Organic Synthesis and Process Chemistry, CSIR-Indian Institute of Chemical Technology, Tarnaka, Hyderabad, Telangana 500007, India.,Academy of Scientific and Innovative Research, Ghaziabad, Uttar Pradesh 201 002, India
| | - Ram Ambre
- Institute of Chemistry, Academia Sinica, Nangang, Taipei 11529, Taiwan, Republic of China
| | - Manoj V Mane
- KAUST Catalysis Centre, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia
| | - Siddappa A Patil
- Centre for Nano and Material Sciences, Jain University, Jain Global Campus, Bangalore, Karnataka 562112, India
| | - Balasubramanian Sridhar
- Center for X-ray Crystallography Analytical Department, CSIR-Indian Institute of Chemical Technology, Tarnaka, Hyderabad, Telangana 500007, India
| | - Ramesh B Dateer
- Centre for Nano and Material Sciences, Jain University, Jain Global Campus, Bangalore, Karnataka 562112, India
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10
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Ye YF, Yang WW, Zhang JW, Fu JY, Zhu JY, Wang YB. Phosphine-Catalyzed Synthesis of 3-Allyl-4-pyrones by the Tandem Reaction of Diynones and Allylic Alcohols. J Org Chem 2021; 86:14476-14484. [PMID: 34658239 DOI: 10.1021/acs.joc.1c01340] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
A simple and effective tandem reaction of diynones and allylic alcohols was developed to afford functionalized 3-allyl-4-pyrones in moderate to excellent yields. This protocol underwent a Michael addition─Claisen rearrangement─O-cyclization process, which exhibited broad substrate tolerance, high regioselectivity, and atom economy under a metal-free condition. Moreover, functional transformation of the products was also further studied.
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Affiliation(s)
- Ya-Fang Ye
- Institute of Functional Organic Molecular Engineering, Henan Engineering Laboratory of Flame-Retardant and Functional Materials, College of Chemistry and Chemical Engineering, Henan University, Kaifeng, 475004, China
| | - Wan-Wan Yang
- Institute of Functional Organic Molecular Engineering, Henan Engineering Laboratory of Flame-Retardant and Functional Materials, College of Chemistry and Chemical Engineering, Henan University, Kaifeng, 475004, China
| | - Jing-Wen Zhang
- Institute of Functional Organic Molecular Engineering, Henan Engineering Laboratory of Flame-Retardant and Functional Materials, College of Chemistry and Chemical Engineering, Henan University, Kaifeng, 475004, China
| | - Ji-Ya Fu
- Institute of Functional Organic Molecular Engineering, Henan Engineering Laboratory of Flame-Retardant and Functional Materials, College of Chemistry and Chemical Engineering, Henan University, Kaifeng, 475004, China
| | - Jun-Yan Zhu
- Institute of Functional Organic Molecular Engineering, Henan Engineering Laboratory of Flame-Retardant and Functional Materials, College of Chemistry and Chemical Engineering, Henan University, Kaifeng, 475004, China
| | - Yan-Bo Wang
- Institute of Functional Organic Molecular Engineering, Henan Engineering Laboratory of Flame-Retardant and Functional Materials, College of Chemistry and Chemical Engineering, Henan University, Kaifeng, 475004, China
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11
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Lam H, Lautens M, Abel-Snape X, Köllen MF. Recent Advances in Transition-Metal-Free (4+3)-Annulations. SYNTHESIS-STUTTGART 2021. [DOI: 10.1055/s-0040-1706023] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Abstract(4+3)-Annulations are incredibly versatile reactions which combine a 4-atom synthon and a 3-atom synthon to form both 7-membered carbocycles as well as heterocycles. We have previously reviewed transition-metal-catalyzed (4+3)-annulations. In this review, we will cover examples involving bases, NHCs, phosphines, Lewis and Brønsted acids as well as some rare examples of boronic acid catalysis and photocatalysis. In analogy to our previous review, we exclude annulations involving cyclic dienes like furan, pyrrole, cyclohexadiene or cyclopentadiene, as Chiu, Harmata, Fernándes and others have recently published reviews encompassing such substrates. We will however discuss the recent additions (2010–2020) to the literature on (4+3)-annulations involving other types of 4-atom-synthons.1 Introduction2 Bases3 Annulations Using N-Heterocyclic Carbenes3.1 N-Heterocyclic Carbenes (NHCs)3.2 N-Heterocyclic Carbenes and Base Dual-Activation4 Phosphines5 Acids5.1 Lewis Acids5.2 Brønsted Acids6 Boronic Acid Catalysis and Photocatalysis7 Conclusion
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Affiliation(s)
- Heather Lam
- Davenport Research Laboratories, Department of Chemistry, University of Toronto
| | - Mark Lautens
- Davenport Research Laboratories, Department of Chemistry, University of Toronto
| | - Xavier Abel-Snape
- Davenport Research Laboratories, Department of Chemistry, University of Toronto
| | - Martin F. Köllen
- Ludwig-Maximilians-Universität München, Department Chemie und Biochemie
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12
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Zhou N, Wu S, Kuang K, Xia Z, Xu Q, Zhang M. A photoredox- or metal-catalyzed three-component cyanoalkylsulfonylation reaction of 1-(allyloxy)-2-(1-arylvinyl)benzenes, potassium metabisulfite, and cycloketone oxime esters: synthesis of cyanoalkylsulfonylated benzoxepines. Org Chem Front 2021. [DOI: 10.1039/d1qo01183a] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
A visible light photocatalyzed or metal-catalyzed three-component cyanoalkylsulfonylation of 1-(allyloxy)-2-(1-arylvinyl)benzenes, potassium metabisulfite and cyclobutanone oxime esters is developed.
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Affiliation(s)
- Nengneng Zhou
- Key Laboratory of Functionalized Molecular Solids, Ministry of Education, Anhui Key Laboratory of Molecule-Based Materials, College of Chemistry and Materials Science, Anhui Normal University, Wuhu, Anhui 241000, China
| | - Sixin Wu
- Key Laboratory of Functionalized Molecular Solids, Ministry of Education, Anhui Key Laboratory of Molecule-Based Materials, College of Chemistry and Materials Science, Anhui Normal University, Wuhu, Anhui 241000, China
| | - Kaimo Kuang
- Key Laboratory of Functionalized Molecular Solids, Ministry of Education, Anhui Key Laboratory of Molecule-Based Materials, College of Chemistry and Materials Science, Anhui Normal University, Wuhu, Anhui 241000, China
| | - Ziqin Xia
- Key Laboratory of Functionalized Molecular Solids, Ministry of Education, Anhui Key Laboratory of Molecule-Based Materials, College of Chemistry and Materials Science, Anhui Normal University, Wuhu, Anhui 241000, China
| | - Qiankun Xu
- Key Laboratory of Functionalized Molecular Solids, Ministry of Education, Anhui Key Laboratory of Molecule-Based Materials, College of Chemistry and Materials Science, Anhui Normal University, Wuhu, Anhui 241000, China
| | - Man Zhang
- Key Laboratory of Functionalized Molecular Solids, Ministry of Education, Anhui Key Laboratory of Molecule-Based Materials, College of Chemistry and Materials Science, Anhui Normal University, Wuhu, Anhui 241000, China
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13
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Yang WW, Ye YF, Chen LL, Fu JY, Zhu JY, Wang YB. Catalyst- and Additive-Free Annulation of Ynediones and (Iso)Quinoline N-Oxides: An Approach to Synthesis of Pyrrolo[2,1- a]Isoquinolines and Pyrrolo[1,2- a]Quinolines. J Org Chem 2020; 86:169-177. [PMID: 33252226 DOI: 10.1021/acs.joc.0c01932] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
A simple and effective annulation of ynediones and (iso)quinoline N-oxides was developed to afford various functionalized pyrrolo[2,1-a]isoquinolines and pyrrolo[1,2-a]quinolines in moderate to excellent yields. This protocol underwent a tandem [3 + 2] cycloaddition/ring-opening/N-nucleophilic addition, which exhibited high regioselectivity, broad substrate tolerance, and atom economy under catalyst-, additive-free, and air conditions. Moreover, indolizine was also successfully prepared using pyridine N-oxide.
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Affiliation(s)
- Wan-Wan Yang
- Institute of Functional Organic Molecular Engineering, Henan Engineering Laboratory of Flame-Retardant and Functional Materials, College of Chemistry and Chemical Engineering, Henan University, Kaifeng 75004, China
| | - Ya-Fang Ye
- Institute of Functional Organic Molecular Engineering, Henan Engineering Laboratory of Flame-Retardant and Functional Materials, College of Chemistry and Chemical Engineering, Henan University, Kaifeng 75004, China
| | - Lu-Lu Chen
- Institute of Functional Organic Molecular Engineering, Henan Engineering Laboratory of Flame-Retardant and Functional Materials, College of Chemistry and Chemical Engineering, Henan University, Kaifeng 75004, China
| | - Ji-Ya Fu
- Institute of Functional Organic Molecular Engineering, Henan Engineering Laboratory of Flame-Retardant and Functional Materials, College of Chemistry and Chemical Engineering, Henan University, Kaifeng 75004, China
| | - Jun-Yan Zhu
- Institute of Functional Organic Molecular Engineering, Henan Engineering Laboratory of Flame-Retardant and Functional Materials, College of Chemistry and Chemical Engineering, Henan University, Kaifeng 75004, China
| | - Yan-Bo Wang
- Institute of Functional Organic Molecular Engineering, Henan Engineering Laboratory of Flame-Retardant and Functional Materials, College of Chemistry and Chemical Engineering, Henan University, Kaifeng 75004, China
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14
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Parameshwar M, Singam MKR, Nagireddy A, Nanubolu JB, Reddy MS. Regioselective benzannulation of allylic sulfur ylides with ynones: a rapid access to substituted thioanisoles. Chem Commun (Camb) 2020; 56:13457-13460. [PMID: 33047759 DOI: 10.1039/d0cc05436d] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
The efficiency and selectivity of annulation reactions are often difficult to control in the presence of multiple potential reactive centers, like in the case of allylic sulfur ylides (ASY). Here, we describe a novel base mediated [3+3] benzannulation of ASY and readily available alkynones, which accomplishes the regioselective formation of multisubstituted thioanisoles, highly sought after chemical scaffolds. A new reactivity pattern of ASY has been unearthed, where it acted as both a 3C component and sulfur source in benzannulation. Use of a widely available base, operational simplicity and broad substrate scope are the additional salient features of the conversion.
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Affiliation(s)
- Matam Parameshwar
- Department of OSPC, CSIR-Indian Institute of Chemical Technology, Habsiguda, Hyderabad 500007, India.
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15
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Nagireddy A, Singam MKR, Nanubolu JB, Sridhar Reddy M. Base-Mediated Cyclopentannulation of Ynones with Amino Crotonates for Regio- and Stereoselective Synthesis of Pentafulvenes and Cyclopenta[ c]quinolines. J Org Chem 2020; 85:6970-6980. [PMID: 32421329 DOI: 10.1021/acs.joc.0c00203] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
A regio- and stereoselective synthesis of unsymmetrically substituted pentafulvenes is reported via the condensation of readily available ynones and amino crotonates under very mild conditions. The mechanism of this 3 + 2 annulation involved a vinylogous Michael addition followed by an intramolecular enamine aldol condensation. Substrates with o-bromo tether further cyclized to pentannulated hydroquinolines through an isomerization/SNAr in the same reaction pot at the elevated temperature.
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Affiliation(s)
- Attunuri Nagireddy
- Academy of Scientific and Innovative Research, New Delhi 110001, India.,Department of OSPC, CSIR-Indian Institute of Chemical Technology, Habsiguda, Hyderabad 500007, India
| | - Maneesh Kumar Reddy Singam
- Academy of Scientific and Innovative Research, New Delhi 110001, India.,Department of OSPC, CSIR-Indian Institute of Chemical Technology, Habsiguda, Hyderabad 500007, India
| | | | - Maddi Sridhar Reddy
- Academy of Scientific and Innovative Research, New Delhi 110001, India.,Department of OSPC, CSIR-Indian Institute of Chemical Technology, Habsiguda, Hyderabad 500007, India
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16
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Yang WW, Chen LL, Chen P, Ye YF, Wang YB, Zhang X. Solvent-controlled divergent annulation of ynones and (iso)quinoline N-oxides: of 3-((iso)quinolin-1-yl)-4H-chromen-4-ones and 13H-isoquinolino[2,1-a]quinolin-13-ones. Chem Commun (Camb) 2020; 56:1183-1186. [PMID: 31894780 DOI: 10.1039/c9cc08713c] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
An effective annulation of ynones and (iso)quinoline N-oxides was developed to deliver various functionalized 3-((iso)quinolin-1-yl)-4H-chromen-4-ones and 13H-isoquinolino[2,1-a]quinolin-13-ones in moderate to excellent yields, respectively. This protocol exhibits high regioselectivity and broad substrate scope under transition-metal-free conditions. Moreover, the key reaction intermediate was successfully isolated and determined unambiguously by single crystal X-ray crystallography.
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Affiliation(s)
- Wan-Wan Yang
- Institute of Functional Organic Molecular Engineering, College of Chemistry and Chemical Engineering, Henan University, Kaifeng, 475004, China.
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17
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Liu J, Ba D, Chen Y, Wen S, Cheng G. Synthesis of 3-(2-quinolyl) chromones from ynones and quinoline N-oxides via tandem reactions under transition metal- and additive-free conditions. Chem Commun (Camb) 2020; 56:4078-4081. [DOI: 10.1039/c9cc09460a] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
The synthesis of 3-(2-quinolyl) chromones from ynones and quinoline N-oxides via a sequential [3+2] cycloaddition/ring-opening/O-arylation reaction under transition metal- and additive-free conditions is reported.
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Affiliation(s)
- Jing Liu
- College of Materials Science & Engineering
- Huaqiao University
- Xiamen 361021
- China
| | - Dan Ba
- College of Materials Science & Engineering
- Huaqiao University
- Xiamen 361021
- China
| | - Yanhui Chen
- College of Materials Science & Engineering
- Huaqiao University
- Xiamen 361021
- China
| | - Si Wen
- College of Materials Science & Engineering
- Huaqiao University
- Xiamen 361021
- China
| | - Guolin Cheng
- College of Materials Science & Engineering
- Huaqiao University
- Xiamen 361021
- China
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18
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Yang WW, Zhang JW, Chen LL, Fu JY, Zhu JY, Wang YB. Controllable synthesis of 3-iodo-2H-quinolizin-2-ones and 1,3-diiodo-2H-quinolizin-2-onesviaelectrophilic cyclization of azacyclic ynones. Chem Commun (Camb) 2019; 55:12607-12610. [DOI: 10.1039/c9cc06250e] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
An efficient approach was developed to divergently synthesize 3-ipdo-2H-quinolizin-2-ones and 1,3-diiodo-2H-quinolizin-2-ones from azacyclic ynones with high regioselectivity under metal-free, room temperature conditions in air.
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Affiliation(s)
- Wan-Wan Yang
- Institute of Functional Organic Molecular Engineering
- Henan Engineering Laboratory of Flame-Retardant and Functional Materials
- College of Chemistry and Chemical Engineering
- Henan University
- Kaifeng
| | - Jing-Wen Zhang
- Institute of Functional Organic Molecular Engineering
- Henan Engineering Laboratory of Flame-Retardant and Functional Materials
- College of Chemistry and Chemical Engineering
- Henan University
- Kaifeng
| | - Lu-Lu Chen
- Institute of Functional Organic Molecular Engineering
- Henan Engineering Laboratory of Flame-Retardant and Functional Materials
- College of Chemistry and Chemical Engineering
- Henan University
- Kaifeng
| | - Ji-Ya Fu
- Institute of Functional Organic Molecular Engineering
- Henan Engineering Laboratory of Flame-Retardant and Functional Materials
- College of Chemistry and Chemical Engineering
- Henan University
- Kaifeng
| | - Jun-Yan Zhu
- Institute of Functional Organic Molecular Engineering
- Henan Engineering Laboratory of Flame-Retardant and Functional Materials
- College of Chemistry and Chemical Engineering
- Henan University
- Kaifeng
| | - Yan-Bo Wang
- Institute of Functional Organic Molecular Engineering
- Henan Engineering Laboratory of Flame-Retardant and Functional Materials
- College of Chemistry and Chemical Engineering
- Henan University
- Kaifeng
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19
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Zhang JW, Yang WW, Chen LL, Chen P, Wang YB, Chen DY. An efficient tandem synthesis of chromones from o-bromoaryl ynones and benzaldehyde oxime. Org Biomol Chem 2019; 17:7461-7467. [DOI: 10.1039/c9ob01387c] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
A transition-metal-free approach was developed to synthesize chromones from o-bromoaryl ynones and benzaldehyde oxime by sequential C–O bond formation.
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Affiliation(s)
- Jing-Wen Zhang
- Institute of Functional Organic Molecular Engineering
- Henan Engineering Laboratory of Flame-Retardant and Functional Materials
- College of Chemistry and Chemical Engineering
- Henan University
- Kaifeng
| | - Wan-Wan Yang
- Institute of Functional Organic Molecular Engineering
- Henan Engineering Laboratory of Flame-Retardant and Functional Materials
- College of Chemistry and Chemical Engineering
- Henan University
- Kaifeng
| | - Lu-Lu Chen
- Institute of Functional Organic Molecular Engineering
- Henan Engineering Laboratory of Flame-Retardant and Functional Materials
- College of Chemistry and Chemical Engineering
- Henan University
- Kaifeng
| | - Pei Chen
- Institute of Functional Organic Molecular Engineering
- Henan Engineering Laboratory of Flame-Retardant and Functional Materials
- College of Chemistry and Chemical Engineering
- Henan University
- Kaifeng
| | - Yan-Bo Wang
- Institute of Functional Organic Molecular Engineering
- Henan Engineering Laboratory of Flame-Retardant and Functional Materials
- College of Chemistry and Chemical Engineering
- Henan University
- Kaifeng
| | - Dan-Yun Chen
- Institute of Functional Organic Molecular Engineering
- Henan Engineering Laboratory of Flame-Retardant and Functional Materials
- College of Chemistry and Chemical Engineering
- Henan University
- Kaifeng
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