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Pu X, Fu Z, Yang Y, Wu D, Deng P, Lan J. One-Pot Synthesis of Dihydrobenzo[ a]fluorenes via Cascade C-H Annulation of Thiobenzamide with Alkynes. J Org Chem 2024. [PMID: 39259937 DOI: 10.1021/acs.joc.4c01228] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/13/2024]
Abstract
We herein disclose a highly efficient one-pot synthetic strategy for dihydrobenzo[a]fluorenes via cascade rhodium(III)-catalyzed ortho-C-H activation/annulation of thiobenzamides with aryl ethynyl ketones and subsequently copper(II)-promoted intramolecular C-H/C-H cross-coupling reactions. Mechanistic investigations suggest that Cu(II) plays two crucial roles by serving as a sulfide scavenger to regenerate the Rh(III) catalyst and promoting the intramolecular C-H/C-H cross-coupling reaction. This protocol greatly streamlines accesses to a variety of appealing tetracyclic benzo[a]fluorene skeletons, which may have potential biological activity and medicinal properties.
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Affiliation(s)
- Xingwen Pu
- Key Laboratory of Green Chemistry and Technology of Ministry of Education, College of Chemistry, Sichuan University, 29 Wangjiang Road, Chengdu 610064, China
| | - Zhangyi Fu
- Key Laboratory of Green Chemistry and Technology of Ministry of Education, College of Chemistry, Sichuan University, 29 Wangjiang Road, Chengdu 610064, China
| | - Yudong Yang
- Key Laboratory of Green Chemistry and Technology of Ministry of Education, College of Chemistry, Sichuan University, 29 Wangjiang Road, Chengdu 610064, China
| | - Di Wu
- Key Laboratory of Green Chemistry and Technology of Ministry of Education, College of Chemistry, Sichuan University, 29 Wangjiang Road, Chengdu 610064, China
| | - Pengchi Deng
- Analytical & Testing Center, Sichuan University, 29 Wangjiang Road, Chengdu 610064, China
| | - Jingbo Lan
- Key Laboratory of Green Chemistry and Technology of Ministry of Education, College of Chemistry, Sichuan University, 29 Wangjiang Road, Chengdu 610064, China
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2
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Ding L, Wang N, Qi C, Chen J, Chang J, Wang XN. TfOH-Catalyzed Reactions of Aryl Methyl Ketones with Ynamides: Synthesis of 1-Amino-1 H-indenes and 2,4-Dienamides. J Org Chem 2024. [PMID: 39196698 DOI: 10.1021/acs.joc.4c01712] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/30/2024]
Abstract
The efficient synthesis of 1-amino-1H-indenes and 2,4-dienamides was realized via TfOH-catalyzed reactions of aryl methyl ketones with terminal ynamides in two distinct pathways. Aromatic ketones with high electrophilicity underwent [3 + 2] annulation with ynamides to produce 1-amino-1H-indenes, while aromatic ketones with low electrophilicity proceeded under the same conditions to afford 2,4-dienamides. Furthermore, the obtained 1-amino-1H-indenes could be converted into the corresponding 1H-indenes and dihydro-1H-indenes in excellent yields.
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Affiliation(s)
- Lixia Ding
- 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, Henan 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, Henan 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, Henan 450001, P. R. China
| | - 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, Henan 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, Henan 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, Henan 450001, P. R. China
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3
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Janecký L, Beier P. Lewis acid-mediated transformations of 5-acyl- N-fluoroalkyl-1,2,3-triazoles to cyclopentenones, indenones, or oxazoles. RSC Adv 2024; 14:13640-13645. [PMID: 38665503 PMCID: PMC11043917 DOI: 10.1039/d4ra01707b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2024] [Accepted: 04/19/2024] [Indexed: 04/28/2024] Open
Abstract
We present a transition metal-free approach to 2-N-substituted indenones, cyclopentenones, and 4-carbonyl oxazoles, based on the reaction of 5-acylated N-fluoroalkyl substituted 1,2,3-triazoles (prepared by a three-component click reaction of copper acetylides, fluoroalkyl azides, and acyl chlorides) with Lewis acids aluminium trichloride or boron trifluoride etherate, proceeding via the generation and cyclization of vinyl cations.
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Affiliation(s)
- Lukáš Janecký
- The Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences Flemingovo nam. 2 16610 Prague 6 Czech Republic
- Department of Organic Chemistry, Faculty of Science, Charles University Hlavova 2030/8 128 43 Prague 2 Czech Republic
| | - Petr Beier
- The Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences Flemingovo nam. 2 16610 Prague 6 Czech Republic
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4
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Sethi M, Dutta S, Sahoo AK. Regioselective Twofold Annulation of Propargyl Acetates. Org Lett 2024; 26:3224-3229. [PMID: 38564371 DOI: 10.1021/acs.orglett.4c00834] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/04/2024]
Abstract
The regioselective annulation of unsymmetrical alkynes has always been a focused research topic. A Pd-catalyzed double annulation of unsymmetrical alkynes (i.e., yne-acetates) with aryl diazonium salts for the synthesis of substituted naphthalene derivatives is developed. The process addresses intrinsic regioselectivity challenges in the annulations of unsymmetrical alkynes. Mechanistic investigations shed light on the crucial role of the acetate-directing groups in determining the regiochemical reaction outcome.
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Affiliation(s)
- Manoj Sethi
- School of Chemistry, University of Hyderabad, Gachibowli, Telangana 500046, India
| | - Shubham Dutta
- School of Chemistry, University of Hyderabad, Gachibowli, Telangana 500046, India
| | - Akhila K Sahoo
- School of Chemistry, University of Hyderabad, Gachibowli, Telangana 500046, India
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5
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Kotipalli R, Nanubolu JB, Reddy MS. Pd-Catalyzed Chelation-Assisted Regioselective and Site Selective Cyclative C-H Annulation of Alkynyl Oximes with Activated Alkynes. J Org Chem 2024; 89:3834-3843. [PMID: 38421425 DOI: 10.1021/acs.joc.3c02665] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/02/2024]
Abstract
Electrophilic cyclization and concomitant C-H annulation constitute an expedient cascade strategy for the construction of multicyclic scaffolds with precise substitutional patterns. We report here a novel Pd-catalyzed cyclative annulation of ynone oxime with activated alkynes. The cascade features a dual regioselectivity including site selective C-H activation and chelation-assisted selective insertion of alkynes. Control experiments together with kinetic experiments give insights into the mechanism.
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Affiliation(s)
- Ramesh Kotipalli
- Department of Organic Synthesis & Process Chemistry, CSIR-Indian Institute of Chemical Technology, Hyderabad 500007, India
- Academy of Scientific and Innovative Research, Ghaziabad 201002, India
| | | | - Maddi Sridhar Reddy
- Department of Organic Synthesis & Process Chemistry, CSIR-Indian Institute of Chemical Technology, Hyderabad 500007, India
- Academy of Scientific and Innovative Research, Ghaziabad 201002, India
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6
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Zhu YL, Zhao N, Fu XL, Zhao XY, Li YL, Shao YD, Chen J, Lu Y. Co(III)-Catalyzed C6-Selective C-H Activation/Pyridine Migration of 2-Pyridones with Propiolates. Org Lett 2024; 26:12-17. [PMID: 38127552 DOI: 10.1021/acs.orglett.3c03358] [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
A versatile Co(III)-catalyzed C6-selective C-H activation/pyridine migration of 2-pyridones with available propiolates as coupling partners was demonstrated. This method features high atom economy, excellent regioselectivity, and good functional group tolerance by employing an inexpensive Co(III) catalyst under mild reaction conditions. Moreover, gram-scale synthesis and late-stage modifications of pharmaceuticals were performed to prove the effectiveness of these synthetic approaches.
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Affiliation(s)
- Yue-Lu Zhu
- School of Chemistry and Chemical Engineering, Heze University, Heze, Shandong 274015, P. R. China
| | - Na Zhao
- School of Chemistry and Chemical Engineering, Heze University, Heze, Shandong 274015, P. R. China
| | - Xin-Long Fu
- School of Chemistry and Chemical Engineering, Heze University, Heze, Shandong 274015, P. R. China
| | - Xin-Yang Zhao
- Coordination Chemistry Institute, State Key Laboratory of Coordination Chemistry, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210023, China
| | - Yan-Lin Li
- School of Chemistry and Chemical Engineering, Heze University, Heze, Shandong 274015, P. R. China
| | - You-Dong Shao
- School of Chemistry and Chemical Engineering, Heze University, Heze, Shandong 274015, P. R. China
| | - Jiao Chen
- College of Chemistry & Materials Science, Northwest University, Xi'an, Shaanxi 710127, P. R. China
- College of Life Sciences, Northwest University, Xi'an, Shaanxi 710069, P. R. China
| | - Yi Lu
- Coordination Chemistry Institute, State Key Laboratory of Coordination Chemistry, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210023, China
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Hansjacob P, Schwoerer C, Leroux FR, Donnard M. Synthesis of 2-amidoindenone derivatives through an ynamide carbosilylation/Houben-Hoesch cyclization 2-step sequence. Org Biomol Chem 2023; 22:70-73. [PMID: 38050722 DOI: 10.1039/d3ob01787g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/06/2023]
Abstract
Herein we report the efficient and selective two-step synthesis of various 3-silyl-2-amidoindenones from easily accessible ynamides. This sequence involves a regio- and stereo-selective silylcyanation followed by a Houben-Hoesch type cyclization. Thanks to post-transformations, various 3-substituted 2-amidoindenones could be obtained.
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Affiliation(s)
- Pierre Hansjacob
- University of Strasbourg, University of Haute-Alsace, CNRS, UMR 7042-LIMA, ECPM, 67000 Strasbourg, France.
| | - Célia Schwoerer
- University of Strasbourg, University of Haute-Alsace, CNRS, UMR 7042-LIMA, ECPM, 67000 Strasbourg, France.
| | - Frédéric R Leroux
- University of Strasbourg, University of Haute-Alsace, CNRS, UMR 7042-LIMA, ECPM, 67000 Strasbourg, France.
| | - Morgan Donnard
- University of Strasbourg, University of Haute-Alsace, CNRS, UMR 7042-LIMA, ECPM, 67000 Strasbourg, France.
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8
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Sau S, Mukherjee K, Kondalarao K, Gandon V, Sahoo AK. Probing Chiral Sulfoximine Auxiliaries in Ru(II)-Catalyzed One-Pot Asymmetric C-H Hydroarylation and Annulations with Alkynes. Org Lett 2023; 25:7667-7672. [PMID: 37844260 DOI: 10.1021/acs.orglett.3c02969] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2023]
Abstract
Developed herein is a chiral sulfoximine-enabled Ru(II)-catalyzed asymmetric C-H activation/functionalization involving intramolecular hydroarylation and functionalization/annulation of alkynes. This process constructs dihydrobenzofuran- or indoline-fused isoquinolinones having a tertiary or quaternary stereocenter with good yields and enantioselectivities (up to 97:3 enantiomeric ratio). The chiral sulfoxide precursor used in synthesizing the enantiopure sulfoximines is spontaneously eliminated during the reaction. It can be recovered without losing enantiopurity (∼99% enantiomeric excess) and reused.
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Affiliation(s)
- Somratan Sau
- School of Chemistry, University of Hyderabad, Hyderabad, Telangana 500046, India
| | - Kallol Mukherjee
- School of Chemistry, University of Hyderabad, Hyderabad, Telangana 500046, India
| | - Koneti Kondalarao
- School of Chemistry, University of Hyderabad, Hyderabad, Telangana 500046, India
| | - Vincent Gandon
- Institut de Chimie Moléculaire et des Matériaux d'Orsay, CNRS UMR 8182, Université Paris-Saclay, 91405 Orsay, France
| | - Akhila K Sahoo
- School of Chemistry, University of Hyderabad, Hyderabad, Telangana 500046, India
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Kotipalli R, Babu US, Nanubolu JB, Reddy MS. Rh-catalyzed chemo-, stereo- and regioselective C-H cascade annulation of indolyloxopropanenitriles for pyranoindoles. Chem Commun (Camb) 2023; 59:10137-10140. [PMID: 37503886 DOI: 10.1039/d3cc02762g] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/29/2023]
Abstract
Selective annulations of alkynes represent a powerful tool for constructing multicyclic scaffolds while installing desired substitution patterns with precision. Herein, we report a Rh-catalyzed unique annulation of indolyl oxopropanenitrile with hydroxy-alkynoates to access pyranoindole cyclic motifs, featuring enol oxygen as a rare chemoselective reactive terminal. The reaction proceeds via a five-membered oxy-rodacycle through C-H activation by a rhodium complex guided by enolic- and propargyloxy dual co-ordination to enable a regio- and stereoselective modular assembly.
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Affiliation(s)
- Ramesh Kotipalli
- Department of OSPC, CSIR-Indian Institute of Chemical Technology, Habsiguda, Hyderabad 500007, India.
- Academy of Scientific and Innovative Research, Ghaziabad 201002, India
| | - Undamatla Suri Babu
- Department of OSPC, CSIR-Indian Institute of Chemical Technology, Habsiguda, Hyderabad 500007, India.
- Academy of Scientific and Innovative Research, Ghaziabad 201002, India
| | | | - Maddi Sridhar Reddy
- Department of OSPC, CSIR-Indian Institute of Chemical Technology, Habsiguda, Hyderabad 500007, India.
- Academy of Scientific and Innovative Research, Ghaziabad 201002, India
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10
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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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