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Wang M, Xu Y, Hou H, Zhang X, Fan X. Divergent synthesis of pyrrolizine derivatives through C-H bond functionalization of pyrroles. Chem Commun (Camb) 2024; 60:6536-6539. [PMID: 38841891 DOI: 10.1039/d4cc02158d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/07/2024]
Abstract
Presented herein is the synthesis of diversely functionalized pyrrolizines from the reaction of N-alkoxycarbamoyl pyrroles with CF3-ynones. The formation of the product is based on a C-H bond activation-initiated cascade process including N-alkoxycarbamoyl group-directed alkenylation of the pyrrole scaffold followed by simultaneous intramolecular nucleophilic addition along with cleavage and transfer of the directing group. By taking advantage of the rich chemistry of the transferred alkoxycarbamoyl moiety, the products could be transformed into a series of structurally and biologically interesting pyrrolizine derivatives. To our knowledge, this is the first example in which the N-alkoxycarbamoyl unit acted as a transferable and transformable directing group for the divergent synthesis of pyrrolizines.
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Affiliation(s)
- Manqing Wang
- State Key Laboratory of Antiviral Drugs, Pingyuan Laboratory, Key Laboratory of Green Chemical Media and Reactions, Ministry of Education, School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang, Henan 453007, China.
| | - Yuanshuang Xu
- State Key Laboratory of Antiviral Drugs, Pingyuan Laboratory, Key Laboratory of Green Chemical Media and Reactions, Ministry of Education, School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang, Henan 453007, China.
| | - Huihang Hou
- State Key Laboratory of Antiviral Drugs, Pingyuan Laboratory, Key Laboratory of Green Chemical Media and Reactions, Ministry of Education, School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang, Henan 453007, China.
| | - Xinying Zhang
- State Key Laboratory of Antiviral Drugs, Pingyuan Laboratory, Key Laboratory of Green Chemical Media and Reactions, Ministry of Education, School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang, Henan 453007, China.
| | - Xuesen Fan
- State Key Laboratory of Antiviral Drugs, Pingyuan Laboratory, Key Laboratory of Green Chemical Media and Reactions, Ministry of Education, School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang, Henan 453007, China.
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Jadhav PP, Kahar NM, Dawande SG. Ruthenium(II)-Catalyzed Highly Chemo- and Regioselective Oxidative C6 Alkenylation of Indole-7-carboxamides. Org Lett 2021; 23:8673-8677. [PMID: 34723545 DOI: 10.1021/acs.orglett.1c02948] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
We disclosed the first efficient method for highly chemo- and regioselective C6 alkenylation of indole-7-carboxamides using inexpensive Ru(II) catalyst through chelation assisted C-H bond activation. Electronically diverse indole-7-carboxamides and alkenes react efficiently to produce a wide range of C6 alkenyl indole derivatives. Further the C6 alkenyl indole-7-carboxamides modified to their derivatives through simple chemical transformations. The observed regioselectivity and kinetics has been evidenced by deuterium incorporation and intermolecular competitive studies. In addition, for mechanistic insights, the intermediates were analyzed by HRMS.
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Affiliation(s)
- Pankaj P Jadhav
- Department of Chemistry, Institute of Chemical Technology, Mumbai, Maharashtra 400019, India
| | - Nilesh M Kahar
- Department of Chemistry, Institute of Chemical Technology, Mumbai, Maharashtra 400019, India
| | - Sudam G Dawande
- Department of Chemistry, Institute of Chemical Technology, Mumbai, Maharashtra 400019, India
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3
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Natho P, Yang Z, Allen LAT, Rey J, White AJP, Parsons PJ. An entry to 2-(cyclobut-1-en-1-yl)-1 H-indoles through a cyclobutenylation/deprotection cascade. Org Biomol Chem 2021; 19:4048-4053. [PMID: 33885127 DOI: 10.1039/d1ob00430a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
A transition-metal-free strategy for the synthesis of 2-(cyclobut-1-en-1-yl)-1H-indoles under mild conditions is described herein. A series of substituted 2-(cyclobut-1-en-1-yl)-1H-indoles are accessed by a one-pot cyclobutenylation/deprotection cascade from N-Boc protected indoles. Preliminary experimental and density functional theory calculations suggest that a Boc-group transfer is involved in the underlying mechanism.
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Affiliation(s)
- Philipp Natho
- Department of Chemistry, Imperial College London, Molecular Sciences Research Hub, W12 0BZ London, UK.
| | - Zeyu Yang
- Department of Chemistry, Imperial College London, Molecular Sciences Research Hub, W12 0BZ London, UK.
| | - Lewis A T Allen
- Department of Chemistry, Imperial College London, Molecular Sciences Research Hub, W12 0BZ London, UK.
| | - Juliette Rey
- Department of Chemistry, Imperial College London, Molecular Sciences Research Hub, W12 0BZ London, UK.
| | - Andrew J P White
- Department of Chemistry, Imperial College London, Molecular Sciences Research Hub, W12 0BZ London, UK.
| | - Philip J Parsons
- Department of Chemistry, Imperial College London, Molecular Sciences Research Hub, W12 0BZ London, UK.
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Chen W, Li C, Li H, Wu Y. Intermolecular Amination of Ketoximes with Anthranils by Rh‐Catalyzed C−H Bond Activation in Air. ASIAN J ORG CHEM 2021. [DOI: 10.1002/ajoc.202100043] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Weiqiang Chen
- Weihai Marine Organism & Medical Technology Research Institute Harbin Institute of Technology 2 Wenhuaxi Road Weihai 264209 P.R. China
| | - Chao‐Yi Li
- Weihai Marine Organism & Medical Technology Research Institute Harbin Institute of Technology 2 Wenhuaxi Road Weihai 264209 P.R. China
| | - Hui‐Jing Li
- Weihai Marine Organism & Medical Technology Research Institute Harbin Institute of Technology 2 Wenhuaxi Road Weihai 264209 P.R. China
- Weihai Huiankang Biotechnology Co., Ltd Weihai 264200 P. R. China
| | - Yan‐Chao Wu
- Weihai Marine Organism & Medical Technology Research Institute Harbin Institute of Technology 2 Wenhuaxi Road Weihai 264209 P.R. China
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Hunjan MK, Panday S, Gupta A, Bhaumik J, Das P, Laha JK. Recent Advances in Functionalization of Pyrroles and their Translational Potential. CHEM REC 2021; 21:715-780. [PMID: 33650751 DOI: 10.1002/tcr.202100010] [Citation(s) in RCA: 36] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2021] [Revised: 02/08/2021] [Accepted: 02/10/2021] [Indexed: 12/25/2022]
Abstract
Among the known aromatic nitrogen heterocycles, pyrrole represents a privileged aromatic heterocycle ranging its occurrence in the key component of "pigments of life" to biologically active natural products to active pharmaceuticals. Pyrrole being an electron-rich heteroaromatic compound, its predominant functionalization is legendary to aromatic electrophilic substitution reactions. Although a few excellent reviews on the functionalization of pyrroles including the reports by Baltazzi in 1963, Casiraghi and Rassu in 1995, and Banwell in 2006 are available, they are fragmentary and over fifteen years old, and do not cover the modern aspects of catalysis. A review covering a comprehensive package of direct functionalization on pyrroles via catalytic and non-catalytic methods including their translational potential is described. Subsequent to statutory yet concise introduction, the classical functionalization on pyrroles using Lewis acids largely following an ionic mechanism is discussed. The subsequent discussion follows the various metal-catalyzed C-H functionalization on pyrroles, which are otherwise difficult to implement by Lewis acids. A major emphasize is given on the radical based pyrrole functionalization under metal-free oxidative conditions, which is otherwise poorly highlighted in the literature. Towards the end, the current development of pyrrole functionalization under photocatalyzed and electrochemical conditions is appended. Only a selected examples of substrates and important mechanisms are discussed for different methods highlighting their scopes and limitations. The aromatic nucleophillic substitution on pyrroles (being an electron-rich heterocycle) happened to be the subject of recent investigations, which has also been covered accentuating their underlying conceptual development. Despite great achievements over the past several years in these areas, many challenges and problems are yet to be solved, which are all discussed in summary and outlook.
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Affiliation(s)
- Mandeep Kaur Hunjan
- Department of Pharmaceutial Technology (Process Chemistry), National Institute of Pharmaceutical Education & Research (NIPER) S.A.S. Nagar, Mohali, 160062, India
| | - Surabhi Panday
- Department of Pharmaceutial Technology (Process Chemistry), National Institute of Pharmaceutical Education & Research (NIPER) S.A.S. Nagar, Mohali, 160062, India
| | - Anjali Gupta
- Department of Pharmaceutial Technology (Process Chemistry), National Institute of Pharmaceutical Education & Research (NIPER) S.A.S. Nagar, Mohali, 160062, India
| | - Jayeeta Bhaumik
- Center of Innovative and Applied Bioprocessing (CIAB), Department of Biotechnology (DBT), Government of India, Sector 81 (Knowledge City), S.A.S., Nagar, 140306, Punjab, India
| | - Parthasarathi Das
- Department of Chemistry, Indian Institute of Technology (Indian School of Mines) Dhanbad, Dhanbad, 826004, India
| | - Joydev K Laha
- Department of Pharmaceutial Technology (Process Chemistry), National Institute of Pharmaceutical Education & Research (NIPER) S.A.S. Nagar, Mohali, 160062, India
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Chen W, Li HJ, Cheng YF, Wu YC. Direct C2-arylation of N-acyl pyrroles with aryl halides under palladium catalysis. Org Biomol Chem 2021; 19:1555-1564. [PMID: 33506844 DOI: 10.1039/d0ob02579h] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
C2-arylation of N-acyl pyrroles with aryl halides is developed for the first time using Pd(PPh3)4 as a catalyst in combination with Ag2CO3 under air, which allowed the application of a good compatibility catalytic system. This protocol provides a straightforward method for the preparation of valuable arylated pyrroles in moderate to good yields under the standard conditions with good substrate tolerance. Interestingly, while N-benzoyl pyrroles reacted well, the use of substrates with a thiophene or furan ring indicated that the thiophene and furan rings are more reactive than pyrrole for the present catalytic system.
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Affiliation(s)
- Weiqiang Chen
- Weihai Marine Organism & Medical Technology Research Institute, Harbin Institute of Technology, Weihai 264209, P.R. China.
| | - Hui-Jing Li
- Weihai Marine Organism & Medical Technology Research Institute, Harbin Institute of Technology, Weihai 264209, P.R. China. and Weihai Huiankang Biotechnology Co., Ltd, Weihai 264200, P. R. China
| | - Yun-Fei Cheng
- Weihai Marine Organism & Medical Technology Research Institute, Harbin Institute of Technology, Weihai 264209, P.R. China.
| | - Yan-Chao Wu
- Weihai Marine Organism & Medical Technology Research Institute, Harbin Institute of Technology, Weihai 264209, P.R. China.
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Abstract
The synthesis of substituted indoles has received great attention in the field of organic synthesis methodology. C–H activation makes it possible to obtain a variety of designed indole derivatives in mild conditions. Ruthenium catalyst, as one of the most significant transition-metal catalysts, has been contributing in the synthesis of indole scaffolds through C–H activation and C–H activation on indoles. Herein, we attempt to present an overview about the construction strategies of indole scaffold and site-specific modifications for indole scaffold via ruthenium-catalyzed C–H activations in recent years.
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Chen W, Li H, Lu W, Wu Y. Ruthenium(II)‐catalyzed Monohydroalkylation of α,β‐Unsaturated Ketones with
N
‐Acyl Pyrroles using a C−H Activation Strategy. ASIAN J ORG CHEM 2020. [DOI: 10.1002/ajoc.202000264] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Weiqiang Chen
- School of Marine Science and Technology Harbin Institute of Technology 2 Wenhuaxi Road Weihai 264209 P.R. China
| | - Hui‐Jing Li
- School of Marine Science and Technology Harbin Institute of Technology 2 Wenhuaxi Road Weihai 264209 P.R. China
- Weihai Huiankang Biotechnology Co. Ltd Weihai 264200 P. R. China
| | - Wen‐Yu Lu
- School of Marine Science and Technology Harbin Institute of Technology 2 Wenhuaxi Road Weihai 264209 P.R. China
| | - Yan‐Chao Wu
- School of Marine Science and Technology Harbin Institute of Technology 2 Wenhuaxi Road Weihai 264209 P.R. China
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