1
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Roy D, Tharra P, Baire B. An approach to functionalized carbazoles from Z-enoate propargylic alcohols. A unified total synthesis of N-Me-carazostatin, N-Me-carbazoquinocin C and N-Me-lipocarbazole A4. Chem Commun (Camb) 2022; 58:10210-10213. [PMID: 36000534 DOI: 10.1039/d2cc03526j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Development of an acid catalyzed, intramolecular benzannulation of indoles for the synthesis of functionalized carbazoles has been reported. The indole appended Z-enoate propargylic alcohols have been employed. The N-EDG-indoles involve the 5-exo-dig cyclization followed by 1,2-migration to give the carbazole-butenoates, whereas the N-EWG-indoles undergo the Z-enoate assisted Meyer-Schuster rearrangement to give the dihydrocarbazole-4-oxo-butanoates. Utilizing one of the 2-methyl-carbazole-butyraldehyde (obtained from the corresponding carbazole-butanoate) as the key intermediate, we have developed a simple approach for an efficient synthesis of N-Me-carazostatin, N-Me-carbazoquinocin C and N-Me-lipocarbazole A4.
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Affiliation(s)
- Debayan Roy
- Department of Chemistry, Indian Institute of Technology Madras, Chennai-600036, India.
| | - Prabhakararao Tharra
- Department of Chemistry, Indian Institute of Technology Madras, Chennai-600036, India.
| | - Beeraiah Baire
- Department of Chemistry, Indian Institute of Technology Madras, Chennai-600036, India.
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2
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Wang B, Zhong H, Tian X. KO tBu-promoted Michael/aldol/ring-opening cascade reaction of cyclobutanones with chalcones. Chem Commun (Camb) 2022; 58:9222-9225. [PMID: 35899611 DOI: 10.1039/d2cc03007a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
An efficient Michael/aldol/ring-opening cascade reaction of cyclobutanones with chalcones has been developed. This protocol employs inexpensive potassium tert-butoxide (KOtBu) as a promoter and enables an efficient synthesis of densely substituted cyclohex-3-ene-carboxylic acids in high yields with high diastereoselectivities, which are difficult to prepare through conventional approaches. The significant advantages of this methodology include transition-metal-free conditions, readily available starting materials, wide scope and high atom economy.
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Affiliation(s)
- Biao 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 & the Fifth Affiliated Hospital, Guangzhou Medical University, Guangzhou, Guangdong 511436, China.
| | - Han Zhong
- 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 & the Fifth Affiliated Hospital, Guangzhou Medical University, Guangzhou, Guangdong 511436, China.
| | - Xu Tian
- 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 & the Fifth Affiliated Hospital, Guangzhou Medical University, Guangzhou, Guangdong 511436, China.
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3
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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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4
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Epton RG, Unsworth WP, Lynam JM. Selectivity, Speciation, and Substrate Control in the Gold-Catalyzed Coupling of Indoles and Alkynes. Organometallics 2022; 41:497-507. [PMID: 35431397 PMCID: PMC9007570 DOI: 10.1021/acs.organomet.2c00035] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2022] [Indexed: 11/28/2022]
Abstract
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A convenient
and mild protocol for the gold-catalyzed intermolecular
coupling of substituted indoles with carbonyl-functionalized alkynes
to give vinyl indoles is reported. This reaction affords 3-substituted
indoles in high yield, and in contrast to the analogous reactions
with simple alkynes which give bisindolemethanes,
only a single indole is added to the alkyne. The protocol is robust
and tolerates substitution at a range of positions of the indole and
the use of ester-, amide-, and ketone-substituted alkynes. The use
of 3-substituted indoles as substrates results in the introduction
of the vinyl substituent at the 2-position of the ring. A combined
experimental and computational mechanistic study has revealed that
the gold catalyst has a greater affinity to the indole than the alkyne,
despite the carbon–carbon bond formation step proceeding through
an η2(π)-alkyne complex, which helps to explain
the stark differences between the intra- and intermolecular variants
of the reaction. This study also demonstrated that the addition of
a second indole to the carbonyl-containing vinyl indole products is
both kinetically and thermodynamically less favored than in the case
of more simple alkynes, providing an explanation for the observed
selectivity. Finally, a highly unusual gold-promoted alkyne dimerization
reaction to form a substituted gold pyrylium salt has been identified
and studied in detail.
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Affiliation(s)
- Ryan G. Epton
- Department of Chemistry, University of York, Heslington, York, YO10 5DD, U.K
| | - William P. Unsworth
- Department of Chemistry, University of York, Heslington, York, YO10 5DD, U.K
| | - Jason M. Lynam
- Department of Chemistry, University of York, Heslington, York, YO10 5DD, U.K
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5
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Wang B, Yan X, Zhong H, ouyang Q, Tian X. Enantioselective [2+2] Cycloaddition of 1,2-Dihydroquinolines with 3-Olefinic Oxindoles via Brønsted Acid Catalysis. Org Chem Front 2022. [DOI: 10.1039/d1qo01708j] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Two complementary regiodivergent Brønsted acid-catalyzed atom-economic [2+2] cycloaddition and ene reaction of 1,2-dihydroquinolines with 3-olefinic oxindoles are reported. In the presence of a chiral phosphoramide catalyst, the [2+2] cycloaddition affords...
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6
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Shelke YG, Hande PE, Gharpure SJ. Recent advances in the synthesis of pyrrolo[1,2- a]indoles and their derivatives. Org Biomol Chem 2021; 19:7544-7574. [PMID: 34524330 DOI: 10.1039/d1ob01103k] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
The pyrrolo[1,2-a]indole unit is a privileged heterocycle found in numerous natural products and has been shown to exhibit diverse pharmacological properties. Thus, recent years have witnessed immense interest from the synthesis community on the synthesis of this scaffold. In light of the ever-increasing demand for pyrrolo[1,2-a]indoles in drug discovery, this review provides an overview of recent synthesis methods for the preparation of pyrrolo[1,2-a]indoles and their derivatives. The mechanistic pathway and stereo-electronic factors affecting the yield and selectivity of the product are briefly explained. Furthermore, we have attempted to demonstrate the utility of the developed methods in the synthesis of bioactive molecules and natural products, wherever offered.
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Affiliation(s)
- Yogesh G Shelke
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai-400076, India.
| | - Pankaj E Hande
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai-400076, India.
| | - Santosh J Gharpure
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai-400076, India.
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7
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Brønsted acid-catalyzed Friedel-Crafts-type alkylation of arenes with α-aryl diazoacetates. Tetrahedron Lett 2021. [DOI: 10.1016/j.tetlet.2020.152751] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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8
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Tang X, Zhang N, He G, Li CH, Huang W, Wang XY, Zhan G, Han B. Unconventional [2 + 3] Cyclization Involving [1,4]-Sulfonyl Transfer to Construct Polysubstituted Fluorazones as Inhibitors of Indoleamine 2,3-Dioxygenase 1. Org Lett 2020; 22:7909-7914. [PMID: 32991179 DOI: 10.1021/acs.orglett.0c02836] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Affiliation(s)
- Xue Tang
- State Key Laboratory of Southwestern Chinese Medicine Resources, School of Pharmacy, Chengdu University of Traditional Chinese Medicine, Chengdu 611137, P.R. China
| | - Nan Zhang
- State Key Laboratory of Southwestern Chinese Medicine Resources, School of Pharmacy, Chengdu University of Traditional Chinese Medicine, Chengdu 611137, P.R. China
| | - Gu He
- State Key Laboratory of Biotherapy and Cancer Center, West China Hospital, Sichuan University and Collaborative Innovation Center of Biotherapy, Chengdu, Sichuan 610041, P.R. China
| | - Cheng-Hao Li
- State Key Laboratory of Southwestern Chinese Medicine Resources, School of Pharmacy, Chengdu University of Traditional Chinese Medicine, Chengdu 611137, P.R. China
| | - Wei Huang
- State Key Laboratory of Southwestern Chinese Medicine Resources, School of Pharmacy, Chengdu University of Traditional Chinese Medicine, Chengdu 611137, P.R. China
| | - Xiao-Yun Wang
- State Key Laboratory of Biotherapy and Cancer Center, West China Hospital, Sichuan University and Collaborative Innovation Center of Biotherapy, Chengdu, Sichuan 610041, P.R. China
| | - Gu Zhan
- State Key Laboratory of Southwestern Chinese Medicine Resources, School of Pharmacy, Chengdu University of Traditional Chinese Medicine, Chengdu 611137, P.R. China
| | - Bo Han
- State Key Laboratory of Southwestern Chinese Medicine Resources, School of Pharmacy, Chengdu University of Traditional Chinese Medicine, Chengdu 611137, P.R. China
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9
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Du L, Han Y, Zhang H, Zhang Y, Zhao J, Liang Y. Synthesis of 1
H
‐Pyrrolo[1,2‐
a
]indoles
via
Lewis Acid‐Catalyzed Annulation of Propargylic Alcohols with 2‐Ethynylanilines. Adv Synth Catal 2020. [DOI: 10.1002/adsc.201901409] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Affiliation(s)
- Li‐Juan Du
- School of Chemical Engineering and TechnologyHebei University of Technology Tianjin 300130 People's Republic of China
| | - Ya‐Ping Han
- School of Chemical Engineering and TechnologyHebei University of Technology Tianjin 300130 People's Republic of China
| | - Hong‐Yu Zhang
- School of Chemical Engineering and TechnologyHebei University of Technology Tianjin 300130 People's Republic of China
| | - Yuecheng Zhang
- School of Chemical Engineering and TechnologyHebei University of Technology Tianjin 300130 People's Republic of China
| | - Jiquan Zhao
- School of Chemical Engineering and TechnologyHebei University of Technology Tianjin 300130 People's Republic of China
| | - Yong‐Min Liang
- State Key Laboratory of Applied Organic ChemistryLanzhou University Lanzhou 730000 People's Republic of China
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10
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Xu K, Chen W, Chen X, Wang B, Huang J, Tian X. Organocatalytic asymmetric Friedel–Crafts alkylation/hemiketalization/lactonization cascade reactions: highly enantioselective synthesis of furo[2,3-b]benzofuranones. Org Chem Front 2020. [DOI: 10.1039/d0qo00475h] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
A highly diastereo- and enantioselective organocatalytic Friedel–Crafts alkylation/hemiketalization/lactonization cascade reaction generating furo[2,3-b]benzofuranones in good to excellent yields with high stereoselectivities.
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Affiliation(s)
- Kunhua Xu
- Key Laboratory of Molecular Target & Clinical Pharmacology and the State Key Laboratory of Respiratory Disease
- School of Pharmaceutical Sciences & The Fifth Affiliated Hospital
- Guangzhou Medical University
- Guangzhou
- China
| | - Wenming Chen
- Department of Pharmaceutical Production Center
- The First Affiliated Hospital of Hunan University of Chinese Medicine
- Changsha
- China
| | - Xu Chen
- Key Laboratory of Molecular Target & Clinical Pharmacology and the State Key Laboratory of Respiratory Disease
- School of Pharmaceutical Sciences & The Fifth Affiliated Hospital
- Guangzhou Medical University
- Guangzhou
- China
| | - Biao Wang
- Key Laboratory of Molecular Target & Clinical Pharmacology and the State Key Laboratory of Respiratory Disease
- School of Pharmaceutical Sciences & The Fifth Affiliated Hospital
- Guangzhou Medical University
- Guangzhou
- China
| | - Jun Huang
- Sino-French Hoffmann Institute
- Guangdong Provincial Key Laboratory of Allergy & Clinical Immunology
- The Second Affiliated Hospital
- Guangzhou Medical University
- Guangzhou
| | - Xu Tian
- Key Laboratory of Molecular Target & Clinical Pharmacology and the State Key Laboratory of Respiratory Disease
- School of Pharmaceutical Sciences & The Fifth Affiliated Hospital
- Guangzhou Medical University
- Guangzhou
- China
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