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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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2
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Efimov IV, Kulikova LN, Miftyakhova AR, Matveeva MD, Voskressensky LG. Recent Advances for the Synthesis of N‐Unsubstituted Pyrroles. ChemistrySelect 2021. [DOI: 10.1002/slct.202103486] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Ilya V. Efimov
- Research Center: Molecular Design and Synthesis of Innovative Compounds for Medicine Peoples' Friendship University of Russia (RUDN University) Miklukho-Maklaya st, 6 117198 Moscow Russia
| | - Larisa N. Kulikova
- Research Center: Molecular Design and Synthesis of Innovative Compounds for Medicine Peoples' Friendship University of Russia (RUDN University) Miklukho-Maklaya st, 6 117198 Moscow Russia
| | - Almira R. Miftyakhova
- Research Center: Molecular Design and Synthesis of Innovative Compounds for Medicine Peoples' Friendship University of Russia (RUDN University) Miklukho-Maklaya st, 6 117198 Moscow Russia
| | - Maria D. Matveeva
- A.V. Topchiev Institute of Petrochemical Synthesis Russian Academy of Sciences Leninsky pr. 29 119991 Moscow Russia
| | - Leonid G. Voskressensky
- Research Center: Molecular Design and Synthesis of Innovative Compounds for Medicine Peoples' Friendship University of Russia (RUDN University) Miklukho-Maklaya st, 6 117198 Moscow Russia
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3
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Davies PW. Gold-Catalyzed Annulations with Nucleophilic Nitrenoids Enabled by Heteroatom-Substituted Alkynes. CHEM REC 2021; 21:3964-3977. [PMID: 34708496 DOI: 10.1002/tcr.202100205] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2021] [Revised: 09/18/2021] [Accepted: 09/20/2021] [Indexed: 11/07/2022]
Abstract
The combination of a nucleophilic nitrene equivalent, a triple bond and a π-acid catalyst has underpinned numerous efficient transformations for the preparation of azacycles. This personal account details our efforts in developing an annulation strategy. Adding a nucleophilic nitrenoid to an activated alkyne can generate carbenoid character that is then quenched by a cyclisation onto the nitrenoid substituent. The use and development of N-acyl and N-heterocyclic pyridinium-N-aminides as 1,3-N,O and 1,3-N,N-dipole equivalents is discussed in the context of oxazole and heterocycle-fused imidazole formation, respectively. The resulting processes are highly efficient, practically straightforward, and tolerate considerable structural and functional group variation. Our use of heteroatom-substituted alkynes as enabling tools for reaction discovery is discussed. The reactivity accessed from the strong donor-like properties of ynamides is complemented by that obtained from alkynyl thioethers, which are emerging as interesting substrates for π-acid catalysis.
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Affiliation(s)
- Paul W Davies
- School of Chemistry, University of Birmingham Edgbaston, Birmingham, B15 2TT, UK
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4
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Simm PE, Sekar P, Richardson J, Davies PW. Gold(I)-Catalyzed Synthesis of 3-Sulfenyl Pyrroles and Indoles by a Regioselective Annulation of Alkynyl Thioethers. ACS Catal 2021; 11:6357-6362. [PMID: 34306808 PMCID: PMC8291588 DOI: 10.1021/acscatal.1c01457] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2021] [Revised: 05/03/2021] [Indexed: 01/01/2023]
Abstract
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The combination of
nucleophilic nitrenoids and π-acid catalysis
has emerged as a powerful tool in heterocycle synthesis. Accessing
more varied heterocycle-substitution patterns by maintaining the same
reaction pathways across different alkynes remains a challenge. Here
we show that Au(I) catalysis of isoxazole-based nitrenoids with alkynyl
thioethers provides controlled access to (3 + 2) annulation by a regioselective
addition β to the sulfenyl group. The reaction with isoxazole-containing
nitrenoids delivers sulfenylated pyrroles and indoles as single regioisomers
bearing useful functional groups and structural variety.
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Affiliation(s)
- Peter E. Simm
- School of Chemistry, University of Birmingham, Edgbaston, Birmingham B15 2TT, U.K
| | - Prakash Sekar
- School of Chemistry, University of Birmingham, Edgbaston, Birmingham B15 2TT, U.K
| | | | - Paul W. Davies
- School of Chemistry, University of Birmingham, Edgbaston, Birmingham B15 2TT, U.K
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Diana-Rivero R, Halsvik B, García Tellado F, Tejedor D. Short and Modular Synthesis of Substituted 2-Aminopyrroles. Org Lett 2021; 23:4078-4082. [PMID: 33929868 PMCID: PMC8483442 DOI: 10.1021/acs.orglett.1c01345] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
We herein describe a simple and metal-free domino methodology to synthesize 2-aminopyrroles from alkynyl vinyl hydrazides. The domino reaction involves a novel propargylic 3,4-diaza-Cope rearrangement and a tandem isomerization/5-exo-dig N-cyclization reaction. By using this approach, a number of 2-aminopyrroles with diverse substituents have been prepared.
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Affiliation(s)
- Raquel Diana-Rivero
- Instituto de Productos Naturales y Agrobiología, CSIC, Astrofísico Francisco Sánchez 3, 38206 La Laguna, Tenerife, Spain.,Doctoral and Postgraduate School, Universidad de La Laguna, Santa Cruz de Tenerife, Spain
| | - Beate Halsvik
- Department of Chemistry, University of Bergen, Allégaten 41, NO-5007 Bergen, Norway
| | - Fernando García Tellado
- Instituto de Productos Naturales y Agrobiología, CSIC, Astrofísico Francisco Sánchez 3, 38206 La Laguna, Tenerife, Spain
| | - David Tejedor
- Instituto de Productos Naturales y Agrobiología, CSIC, Astrofísico Francisco Sánchez 3, 38206 La Laguna, Tenerife, Spain
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Wen H, Yan W, Chen P, Li Y, Tang Y. Catalyst-Free [4+2] Cycloaddition of Ynamides with 2-Halomethyl Phenols To Construct 2-Amino-4 H-Chromenes and α-Halo Enamides Simultaneously. J Org Chem 2020; 85:12870-12881. [PMID: 33000945 DOI: 10.1021/acs.joc.0c01258] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
We report the development of a facile protocol for the [4+2] cycloaddition of ynamides and 2-halomethyl phenols to afford the corresponding 2-amino-4H-chromenes and α-halo enamides under catalyst-free conditions. The reaction proceeds under mild conditions and exhibits good tolerance toward various functional groups and generates high yields. The plausible mechanism involves the formation of an active intermediate keteniminium as well as o-methylene quinone.
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Affiliation(s)
- Hao Wen
- Key Laboratory of Marine Drugs, Chinese Ministry of Education, School of Medicine and Pharmacy, Ocean University of China, Yushan Road, Qingdao 266003, P. R. China
| | - Weibo Yan
- Key Laboratory of Marine Drugs, Chinese Ministry of Education, School of Medicine and Pharmacy, Ocean University of China, Yushan Road, Qingdao 266003, P. R. China
| | - Ping Chen
- Key Laboratory of Marine Drugs, Chinese Ministry of Education, School of Medicine and Pharmacy, Ocean University of China, Yushan Road, Qingdao 266003, P. R. China
| | - Yu Li
- Key Laboratory of Marine Drugs, Chinese Ministry of Education, School of Medicine and Pharmacy, Ocean University of China, Yushan Road, Qingdao 266003, P. R. China
| | - Yu Tang
- Key Laboratory of Marine Drugs, Chinese Ministry of Education, School of Medicine and Pharmacy, Ocean University of China, Yushan Road, Qingdao 266003, P. R. China.,Laboratory for Marine Drugs and Bioproducts, Qingdao National Laboratory for Marine Science and Technology Qingdao 266237, P. R. China
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