51
|
He W, Wang P, Chen J, Xie W. Recent progress in the total synthesis of Strychnos alkaloids. Org Biomol Chem 2020; 18:1046-1056. [DOI: 10.1039/c9ob02627d] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
The recent synthetic approaches toward Strychnos alkaloids are summarized, including novel synthetic methodologies and strategies.
Collapse
Affiliation(s)
- Weigang He
- School of Biology and Food Engineering
- Changshu Institute of Technology
- Changshu 215500
- China
- Shaanxi Key Laboratory of Natural Products & Chemical Biology
| | - Pengyan Wang
- Shaanxi Key Laboratory of Natural Products & Chemical Biology
- College of Chemistry & Pharmacy
- Northwest A&F University
- Yangling 712100
- China
| | - Junhan Chen
- Shaanxi Key Laboratory of Natural Products & Chemical Biology
- College of Chemistry & Pharmacy
- Northwest A&F University
- Yangling 712100
- China
| | - Weiqing Xie
- Shaanxi Key Laboratory of Natural Products & Chemical Biology
- College of Chemistry & Pharmacy
- Northwest A&F University
- Yangling 712100
- China
| |
Collapse
|
52
|
Li Y, Ying F, Fu T, Yang R, Dong Y, Lin L, Han Y, Liang D, Long X. Heat- or light-induced acylarylation of unactivated alkenes towards 3-(α-acyl) indolines. Org Biomol Chem 2020; 18:5660-5665. [DOI: 10.1039/d0ob01105c] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A heat- or photoredox/iron dual catalysis-enabled rare example of radical acylation across unactivated alkenes with aldehydes.
Collapse
Affiliation(s)
- Yanni Li
- School of Chemistry and Chemical Engineering
- Kunming University
- Kunming 650214
- China
| | - Fengyuan Ying
- School of Chemistry and Chemical Engineering
- Kunming University
- Kunming 650214
- China
| | - Tingfeng Fu
- School of Chemistry and Chemical Engineering
- Kunming University
- Kunming 650214
- China
| | - Ruihan Yang
- School of Chemistry and Chemical Engineering
- Kunming University
- Kunming 650214
- China
| | - Ying Dong
- College of Chemistry
- Chemical Engineering and Materials Science
- Shandong Normal University
- Jinan 250014
- China
| | - Liqing Lin
- School of Chemistry and Chemical Engineering
- Kunming University
- Kunming 650214
- China
- Research Center on Life Sciences and Environmental Sciences
| | - Yinghui Han
- School of Chemistry and Chemical Engineering
- Kunming University
- Kunming 650214
- China
- Research Center on Life Sciences and Environmental Sciences
| | - Deqiang Liang
- School of Chemistry and Chemical Engineering
- Kunming University
- Kunming 650214
- China
| | - Xianhao Long
- School of Chemistry and Chemical Engineering
- Kunming University
- Kunming 650214
- China
| |
Collapse
|
53
|
Thakur A, Singh A, Kaur N, Ojha R, Nepali K. Steering the antitumor drug discovery campaign towards structurally diverse indolines. Bioorg Chem 2020; 94:103436. [DOI: 10.1016/j.bioorg.2019.103436] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2019] [Revised: 11/05/2019] [Accepted: 11/11/2019] [Indexed: 12/13/2022]
|
54
|
Alfano AI, Zampella A, Novellino E, Brindisi M, Lange H. Harnessing interrupted Fischer in continuous flow: sustainable synthesis of (spiro)indolenine and (spiro)indoline privileged scaffolds. REACT CHEM ENG 2020. [DOI: 10.1039/d0re00329h] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
3,3-Disubstituted indolenines are obtained via a green and sustainable flow chemistry protocol for interrupted Fischer indolisation reactions.
Collapse
Affiliation(s)
- Antonella Ilenia Alfano
- SPOTS-LAB – Sustainable Pharmaceutical and Organic Technology and Synthesis Laboratory
- Department of Pharmacy
- University of Naples ‘Federico II’
- 80131 Naples
- Italy
| | - Angela Zampella
- SPOTS-LAB – Sustainable Pharmaceutical and Organic Technology and Synthesis Laboratory
- Department of Pharmacy
- University of Naples ‘Federico II’
- 80131 Naples
- Italy
| | - Ettore Novellino
- SPOTS-LAB – Sustainable Pharmaceutical and Organic Technology and Synthesis Laboratory
- Department of Pharmacy
- University of Naples ‘Federico II’
- 80131 Naples
- Italy
| | - Margherita Brindisi
- SPOTS-LAB – Sustainable Pharmaceutical and Organic Technology and Synthesis Laboratory
- Department of Pharmacy
- University of Naples ‘Federico II’
- 80131 Naples
- Italy
| | - Heiko Lange
- SPOTS-LAB – Sustainable Pharmaceutical and Organic Technology and Synthesis Laboratory
- Department of Pharmacy
- University of Naples ‘Federico II’
- 80131 Naples
- Italy
| |
Collapse
|
55
|
Peng H, Jiang K, Zhen G, Wang F, Yin B. Access to N-unprotected 2-amide-substituted indoles from Ugi adducts via palladium-catalyzed intramolecular cyclization of o-iodoanilines bearing furan rings. RSC Adv 2020; 10:11750-11754. [PMID: 35496608 PMCID: PMC9050509 DOI: 10.1039/d0ra01830a] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2020] [Accepted: 02/28/2020] [Indexed: 11/21/2022] Open
Abstract
A variety of N-unprotected 2-amide-substituted indoles were synthesized from readily available furfural-based Ugi adducts in moderate to good yields via palladium-catalyzed intramolecular cyclization of o-iodoanilines bearing furan rings. These reactions involved a cascade sequence consisting of dearomatizing arylation, opening of the furan ring, and deprotection of the N atom. A variety of N-unprotected 2-amide-substituted indoles were synthesized from readily available furfural-based Ugi adducts in moderate to good yields via palladium-catalyzed intramolecular cyclization of o-iodoanilines bearing furan rings.![]()
Collapse
Affiliation(s)
- Hui Peng
- Key Laboratory of Functional Molecular Engineering of Guangdong Province
- School of Chemistry and Chemical Engineering
- South China University of Technology
- Guangzhou
- P. R. China
| | - Kai Jiang
- Key Laboratory of Functional Molecular Engineering of Guangdong Province
- School of Chemistry and Chemical Engineering
- South China University of Technology
- Guangzhou
- P. R. China
| | - Guangjin Zhen
- Key Laboratory of Functional Molecular Engineering of Guangdong Province
- School of Chemistry and Chemical Engineering
- South China University of Technology
- Guangzhou
- P. R. China
| | - Furong Wang
- Key Laboratory of Functional Molecular Engineering of Guangdong Province
- School of Chemistry and Chemical Engineering
- South China University of Technology
- Guangzhou
- P. R. China
| | - Biaolin Yin
- Key Laboratory of Functional Molecular Engineering of Guangdong Province
- School of Chemistry and Chemical Engineering
- South China University of Technology
- Guangzhou
- P. R. China
| |
Collapse
|
56
|
Wei HZ, Yu LZ, Shi M. Lewis or Brønsted acid-catalysed reaction of propargylic alcohol-tethered alkylidenecyclopropanes with indoles and pyrroles for the preparation of polycyclic compounds tethered with indole or pyrrole motif. Org Biomol Chem 2020; 18:135-139. [DOI: 10.1039/c9ob02211b] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We developed a facile synthetic method to access the cyclopenta[b]naphthalene skeleton from Lewis or Brønsted acid-catalysed propargylic alcohol-tethered alkylidenecyclopropanes with indole and pyrrole derivatives.
Collapse
Affiliation(s)
- Hao-Zhao Wei
- Key Laboratory for Advanced Materials and Institute of Fine Chemicals
- School of Chemistry & Molecular Engineering
- East China University of Science and Technology
- Shanghai 200237
- China
| | - Liu-Zhu Yu
- Key Laboratory for Advanced Materials and Institute of Fine Chemicals
- School of Chemistry & Molecular Engineering
- East China University of Science and Technology
- Shanghai 200237
- China
| | - Min Shi
- Key Laboratory for Advanced Materials and Institute of Fine Chemicals
- School of Chemistry & Molecular Engineering
- East China University of Science and Technology
- Shanghai 200237
- China
| |
Collapse
|
57
|
Chen G, Chen S, Luo J, Mao X, Chan AS, Sun RW, Liu Y. Tandem Cross‐Coupling/Spirocyclization/Mannich‐Type Reactions of 3‐(2‐Isocyanoethyl)indoles with Diazo Compounds toward Polycyclic Spiroindolines. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201911614] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Guo‐Shu Chen
- School of Chemistry and Chemical EngineeringGuangzhou University 230 Wai Huan Xi Road Guangzhou 510006 China
| | - Shu‐Jie Chen
- School of Chemistry and Chemical EngineeringGuangzhou University 230 Wai Huan Xi Road Guangzhou 510006 China
| | - Jian Luo
- School of Chemistry and Chemical EngineeringGuangzhou University 230 Wai Huan Xi Road Guangzhou 510006 China
| | - Xiang‐Yu Mao
- School of Chemistry and Chemical EngineeringGuangzhou University 230 Wai Huan Xi Road Guangzhou 510006 China
| | - Albert Sun‐Chi Chan
- Guangzhou Lee & Man Technology Company LimitedRoom 401, Block A 8 Huanshi Avenue South, Nansha Guangzhou China
| | - Raymond Wai‐Yin Sun
- Guangzhou Lee & Man Technology Company LimitedRoom 401, Block A 8 Huanshi Avenue South, Nansha Guangzhou China
| | - Yun‐Lin Liu
- School of Chemistry and Chemical EngineeringGuangzhou University 230 Wai Huan Xi Road Guangzhou 510006 China
| |
Collapse
|
58
|
Zaman M, Hasan M, Peshkov AA, Van Hecke K, Van der Eycken EV, Pereshivko OP, Peshkov VA. Silver(I) Triflate‐Catalyzed Protocol for the Post‐Ugi Synthesis of Spiroindolines. Adv Synth Catal 2019. [DOI: 10.1002/adsc.201901064] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Affiliation(s)
- Manzoor Zaman
- College of Chemistry, Chemical Engineering and Materials ScienceSoochow University Dushu Lake Campus Suzhou 215123 People's Republic of China
| | - Muhammad Hasan
- College of Chemistry, Chemical Engineering and Materials ScienceSoochow University Dushu Lake Campus Suzhou 215123 People's Republic of China
| | - Anatoly A. Peshkov
- Department of Chemistry, School of Science and TechnologyNazarbayev University 53 Kabanbay Batyr Ave, Block 7 Nur-Sultan 010000 Republic of Kazakhstan
| | - Kristof Van Hecke
- XStruct, Department of ChemistryGhent University Krijgslaan 281-S3 B-9000 Ghent Belgium
| | - Erik V. Van der Eycken
- Laboratory of Organic & Microwave-Assisted Chemistry (LOMAC), Department of ChemistryUniversity of Leuven (KU Leuven) Celestijnenlaan 200F B-3001 Leuven Belgium
- Peoples' Friendship University of Russia (RUDN University) Miklukho-Maklaya street 6 Moscow 117198 Russia
| | - Olga P. Pereshivko
- College of Chemistry, Chemical Engineering and Materials ScienceSoochow University Dushu Lake Campus Suzhou 215123 People's Republic of China
- Department of Chemistry, School of Science and TechnologyNazarbayev University 53 Kabanbay Batyr Ave, Block 7 Nur-Sultan 010000 Republic of Kazakhstan
| | - Vsevolod A. Peshkov
- College of Chemistry, Chemical Engineering and Materials ScienceSoochow University Dushu Lake Campus Suzhou 215123 People's Republic of China
- Department of Chemistry, School of Science and TechnologyNazarbayev University 53 Kabanbay Batyr Ave, Block 7 Nur-Sultan 010000 Republic of Kazakhstan
- The Environment and Resource Efficiency Cluster (EREC)Nazarbayev University Nur-Sultan Republic of Kazakhstan
| |
Collapse
|
59
|
Arai N, Ohkuma T. Stereoselective preparation of methylenecyclobutane-fused angular tetracyclic spiroindolines via photosensitized intramolecular [2+2] cycloaddition with allene. Tetrahedron Lett 2019. [DOI: 10.1016/j.tetlet.2019.151252] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
|
60
|
Peng H, Ma J, Duan L, Zhang G, Yin B. CuH-Catalyzed Synthesis of 3-Hydroxyindolines and 2-Aryl-3H-indol-3-ones from o-Alkynylnitroarenes, Using Nitro as Both the Nitrogen and Oxygen Source. Org Lett 2019; 21:6194-6198. [DOI: 10.1021/acs.orglett.9b01849] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Hui Peng
- Key Laboratory of Functional Molecular Engineering of Guangdong Province, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou, People’s Republic of China, 510640
| | - Jinhui Ma
- Department of Food Science and Engineering, Jinan University, Guangzhou 510632, China
| | - Lingfei Duan
- Key Laboratory of Functional Molecular Engineering of Guangdong Province, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou, People’s Republic of China, 510640
| | - Guangwen Zhang
- Department of Food Science and Engineering, Jinan University, Guangzhou 510632, China
| | - Biaolin Yin
- Key Laboratory of Functional Molecular Engineering of Guangdong Province, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou, People’s Republic of China, 510640
| |
Collapse
|
61
|
Liu K, Wang G, Cheng SJ, Jiang WF, He C, Ye ZS. Phosphine-catalyzed dearomative [3+2] annulation of 3-nitroindoles and allenoates. Tetrahedron Lett 2019. [DOI: 10.1016/j.tetlet.2019.06.016] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
|
62
|
Liang D, Huo B, Dong Y, Wang Y, Dong Y, Wang B, Ma Y. Copper-Catalyzed Alkylarylation of Unactivated Alkenes: Synthesis of 3-Alkyl Indolines from N-Allyl Anilines and Alkanes. Chem Asian J 2019; 14:1932-1936. [PMID: 31046195 DOI: 10.1002/asia.201900176] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2019] [Revised: 03/26/2019] [Indexed: 01/14/2023]
Abstract
A rare example of C(sp3 )-H functionalization of simple alkanes with unactivated alkenes is presented. In the presence of a copper salt and di-tert-butyl peroxide (DTBP), N-allyl anilines underwent exo-selective alkylation/cyclization cascade with unactivated alkenic bonds as radical acceptors and simple alkanes as radical precursors, providing a direct access to 3-alkyl indolines. The present protocol features simple operation, broad substrate scope and great exo selectivity.
Collapse
Affiliation(s)
- Deqiang Liang
- Department of Chemistry, Kunming University, 2 Puxin Road, Kunming, Yunnan Province, 650214, China
| | - Bojie Huo
- Department of Chemistry, Kunming University, 2 Puxin Road, Kunming, Yunnan Province, 650214, China
| | - Yongrui Dong
- Department of Chemistry, Kunming University, 2 Puxin Road, Kunming, Yunnan Province, 650214, China
| | - Yan Wang
- Department of Chemistry, Kunming University, 2 Puxin Road, Kunming, Yunnan Province, 650214, China
| | - Ying Dong
- College of Chemistry, Chemical Engineering and Materials Science, Shandong Normal University, Jinan, Shandong Province, 250014, China
| | - Baoling Wang
- Yunnan Engineering Technology Research Center for Plastic Films, Kunming, Yunnan Province, 650214, China
| | - Yinhai Ma
- Department of Chemistry, Kunming University, 2 Puxin Road, Kunming, Yunnan Province, 650214, China
| |
Collapse
|
63
|
Synthesis of cyanoalkyl indolines through cyanoalkylarylation of N-allyl anilines with alkyl nitriles under metal-free and neutral conditions. Tetrahedron 2019. [DOI: 10.1016/j.tet.2019.05.018] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
|
64
|
Saya JM, Ruijter E, Orru RVA. Total Synthesis of
Aspidosperma
and
Strychnos
Alkaloids through Indole Dearomatization. Chemistry 2019; 25:8916-8935. [DOI: 10.1002/chem.201901130] [Citation(s) in RCA: 80] [Impact Index Per Article: 16.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2019] [Indexed: 01/07/2023]
Affiliation(s)
- Jordy M. Saya
- Department of Chemistry & Pharmaceutical Sciences, Amsterdam Institute for Molecules, Medicines & SystemsVrije Universiteit Amsterdam De Boelelaan 1108 1081 HZ Amsterdam The Netherlands
| | - Eelco Ruijter
- Department of Chemistry & Pharmaceutical Sciences, Amsterdam Institute for Molecules, Medicines & SystemsVrije Universiteit Amsterdam De Boelelaan 1108 1081 HZ Amsterdam The Netherlands
| | - Romano V. A. Orru
- Department of Chemistry & Pharmaceutical Sciences, Amsterdam Institute for Molecules, Medicines & SystemsVrije Universiteit Amsterdam De Boelelaan 1108 1081 HZ Amsterdam The Netherlands
| |
Collapse
|
65
|
Huang W, Li X, Song X, Luo Q, Li Y, Dong Y, Liang D, Wang B. Benzylarylation of N-Allyl Anilines: Synthesis of Benzylated Indolines. J Org Chem 2019; 84:6072-6083. [PMID: 31021621 DOI: 10.1021/acs.joc.9b00237] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
An unprecedented benzylic C-H functionalization of methyl arenes across unactivated alkenes is presented. In the presence of MnCl2·4H2O and di- tert-butyl peroxide, N-allyl anilines underwent benzylation/cyclization cascade to give benzylated indolines, which are a previously unmet synthetic goal. This protocol features simple operation, broad substrate scope, and great exo selectivity.
Collapse
Affiliation(s)
- Wenzhong Huang
- Department of Chemistry , Kunming University , Kunming 650214 , China
| | - Xiulan Li
- Department of Chemistry , Kunming University , Kunming 650214 , China
| | - Xuemei Song
- Department of Chemistry , Kunming University , Kunming 650214 , China
| | - Qing Luo
- Department of Chemistry , Kunming University , Kunming 650214 , China
| | - Yanping Li
- Department of Chemistry , Kunming University , Kunming 650214 , China
| | - Ying Dong
- College of Chemistry, Chemical Engineering and Materials Science , Shandong Normal University , Jinan 250014 , China
| | - Deqiang Liang
- Department of Chemistry , Kunming University , Kunming 650214 , China.,Yunnan Engineering Technology Research Center for Plastic Films , Kunming 650214 , China
| | - Baoling Wang
- Department of Chemistry , Kunming University , Kunming 650214 , China.,Yunnan Engineering Technology Research Center for Plastic Films , Kunming 650214 , China
| |
Collapse
|
66
|
Wang X, Zhao X, Li X, Huo B, Dong Y, Liang D, Ma Y. Brønsted acid-catalyzed radical C H functionalization of acetone with N-allyl anilines to give 3-(3-oxobutyl)indolines. Tetrahedron Lett 2019. [DOI: 10.1016/j.tetlet.2019.04.017] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
|
67
|
Huber F, Roesslein J, Gademann K. Preparation of Indolenines via Nucleophilic Aromatic Substitution. Org Lett 2019; 21:2560-2564. [DOI: 10.1021/acs.orglett.9b00489] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- Florian Huber
- Department of Chemistry, University of Zurich, Winterthurerstrasse 190, 8057 Zurich, Switzerland
| | - Joel Roesslein
- Department of Chemistry, University of Zurich, Winterthurerstrasse 190, 8057 Zurich, Switzerland
| | - Karl Gademann
- Department of Chemistry, University of Zurich, Winterthurerstrasse 190, 8057 Zurich, Switzerland
| |
Collapse
|
68
|
|
69
|
Arai N, Ohkuma T. Stereoselective Construction of Methylenecyclobutane-Fused Indolines through Photosensitized [2+2] Cycloaddition of Allene-Tethered Indole Derivatives. Org Lett 2019; 21:1506-1510. [PMID: 30789275 DOI: 10.1021/acs.orglett.9b00309] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Irradiation of 1-(hexa-4,5-dienoyl)indole derivatives in the presence of an aromatic ketone by a high-pressure mercury lamp through Pyrex glass gave the corresponding cyclized products stereoselectively in high yields. The major part of the products was an all- cis-fused methylenecyclobutane-type compound produced through [2+2] cycloaddition, accompanied by small amounts of alkynes via 1,5-hydrogen transfer of a biradical intermediate. Among a range of aromatic ketones, 3',4'-dimethoxyacetophenone was found to sensitize the substrate quite effectively.
Collapse
Affiliation(s)
- Noriyoshi Arai
- Division of Applied Chemistry, Faculty of Engineering , Hokkaido University , Sapporo , Hokkaido 060-8628 , Japan
| | - Takeshi Ohkuma
- Division of Applied Chemistry, Faculty of Engineering , Hokkaido University , Sapporo , Hokkaido 060-8628 , Japan.,Frontier Chemistry Center, Faculty of Engineering , Hokkaido University , Sapporo , Hokkaido 060-8628 , Japan
| |
Collapse
|
70
|
Palladium-mediated domino oxidative amination of cyclohexadienes as an entry to indole alkaloids. Tetrahedron 2019. [DOI: 10.1016/j.tet.2018.12.043] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
|
71
|
Modha SG, Pöthig A, Dreuw A, Bach T. [6π] Photocyclization to cis-Hexahydrocarbazol-4-ones: Substrate Modification, Mechanism, and Scope. J Org Chem 2019; 84:1139-1153. [PMID: 30648858 PMCID: PMC6362434 DOI: 10.1021/acs.joc.8b03144] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
![]()
Upon irradiation at λ = 366
nm, tertiary N-alkoxycarbonyl-N-aryl-β-enaminones
furnished
exclusively the trans-hexahydrocarbazol-4-ones by
a conrotatory [6π] photocyclization but epimerized on silica
to cis-hexahydrocarbazol-4-ones (14 examples, 44–98%
yield). The acceptor substitution on the nitrogen atom enhanced the
stability of the cyclized products compared to N-alkyl-N-aryl-β-enaminones reported previously. The mechanism
of the [6π] photocyclization was investigated by quenching experiments,
deuterium-labeling experiments, and DFT calculations, suggesting a
triplet pathway for the conrotatory ring closure followed by a suprafacial
[1,4] hydrogen migration.
Collapse
Affiliation(s)
- Sachin G Modha
- Department of Chemistry and Catalysis Research Center (CRC) , Technical University of Munich , Lichtenbergstrasse 4 , 85747 Garching , Germany
| | - Alexander Pöthig
- Department of Chemistry and Catalysis Research Center (CRC) , Technical University of Munich , Lichtenbergstrasse 4 , 85747 Garching , Germany
| | - Andreas Dreuw
- Interdisciplinary Center for Scientific Computing , Ruprecht-Karls University , Im Neuenheimer Feld 205A , 69120 Heidelberg , Germany
| | - Thorsten Bach
- Department of Chemistry and Catalysis Research Center (CRC) , Technical University of Munich , Lichtenbergstrasse 4 , 85747 Garching , Germany
| |
Collapse
|
72
|
Zhang GY, Peng Y, Xue J, Fan YH, Deng QH. Copper-catalyzed nitrene transfer/cyclization cascade to synthesize 3a-nitrogenous furoindolines and pyrroloindolines. Org Chem Front 2019. [DOI: 10.1039/c9qo01124b] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Copper-catalyzed nitrene transfer for amination/cyclization of tryptophols and tryptamines to generate the corresponding indole alkaloids in good to excellent yields was successfully developed.
Collapse
Affiliation(s)
- Guang-Yi Zhang
- The Education Ministry Key Lab of Resource Chemistry and Shanghai Key Laboratory of Rare Earth Functional Materials
- Shanghai Normal University
- Shanghai 200234
- P. R. China
| | - Yi Peng
- The Education Ministry Key Lab of Resource Chemistry and Shanghai Key Laboratory of Rare Earth Functional Materials
- Shanghai Normal University
- Shanghai 200234
- P. R. China
| | - Jing Xue
- The Education Ministry Key Lab of Resource Chemistry and Shanghai Key Laboratory of Rare Earth Functional Materials
- Shanghai Normal University
- Shanghai 200234
- P. R. China
| | - Yan-Hui Fan
- The Education Ministry Key Lab of Resource Chemistry and Shanghai Key Laboratory of Rare Earth Functional Materials
- Shanghai Normal University
- Shanghai 200234
- P. R. China
| | - Qing-Hai Deng
- The Education Ministry Key Lab of Resource Chemistry and Shanghai Key Laboratory of Rare Earth Functional Materials
- Shanghai Normal University
- Shanghai 200234
- P. R. China
| |
Collapse
|
73
|
Liang RX, Xu DY, Yang FM, Jia YX. A Pd-catalyzed domino Larock annulation/dearomative Heck reaction. Chem Commun (Camb) 2019; 55:7711-7714. [PMID: 31206107 DOI: 10.1039/c9cc03566d] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
A highly efficient synthesis of indolines from N-bromobenzoyl o-iodoanilines and alkynes is developed via a domino Larock annulation/dearomative Heck reaction.
Collapse
Affiliation(s)
- Ren-Xiao Liang
- College of Chemical Engineering
- State Key Laboratory Breeding Base of Green-Chemical Synthesis Technology
- Zhejiang University of Technology
- Hangzhou 310014
- China
| | - Deng-Yun Xu
- College of Chemical Engineering
- State Key Laboratory Breeding Base of Green-Chemical Synthesis Technology
- Zhejiang University of Technology
- Hangzhou 310014
- China
| | - Fu-Ming Yang
- College of Chemical Engineering
- State Key Laboratory Breeding Base of Green-Chemical Synthesis Technology
- Zhejiang University of Technology
- Hangzhou 310014
- China
| | - Yi-Xia Jia
- College of Chemical Engineering
- State Key Laboratory Breeding Base of Green-Chemical Synthesis Technology
- Zhejiang University of Technology
- Hangzhou 310014
- China
| |
Collapse
|
74
|
Chen S, Ravichandiran P, El-Harairy A, Queneau Y, Li M, Gu Y. 4-Aminoindoles as 1,4-bisnucleophiles for diversity-oriented synthesis of tricyclic indoles bearing 3,4-fused seven-membered rings. Org Biomol Chem 2019; 17:5982-5989. [DOI: 10.1039/c9ob01045a] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
A straightforward access to tricyclic indoles bearing 3,4-fused seven-membered rings was established by using 4-aminoindoles as 1,4-bisnucleophiles in three-component reactions.
Collapse
Affiliation(s)
- Shaomin Chen
- Key Laboratory for Large-Format Battery Materials and System
- Ministry of Education
- School of Chemistry and Chemical Engineering
- Huazhong University of Science and Technology
- Wuhan
| | - Palanisamy Ravichandiran
- Key Laboratory for Large-Format Battery Materials and System
- Ministry of Education
- School of Chemistry and Chemical Engineering
- Huazhong University of Science and Technology
- Wuhan
| | - Ahmed El-Harairy
- Key Laboratory for Large-Format Battery Materials and System
- Ministry of Education
- School of Chemistry and Chemical Engineering
- Huazhong University of Science and Technology
- Wuhan
| | - Yves Queneau
- Institut de Chimie et Biochimie Moléculaires et Supramoléculaires
- Univ Lyon
- CNRS
- Université Lyon 1
- INSA Lyon
| | - Minghao Li
- Key Laboratory for Large-Format Battery Materials and System
- Ministry of Education
- School of Chemistry and Chemical Engineering
- Huazhong University of Science and Technology
- Wuhan
| | - Yanlong Gu
- Key Laboratory for Large-Format Battery Materials and System
- Ministry of Education
- School of Chemistry and Chemical Engineering
- Huazhong University of Science and Technology
- Wuhan
| |
Collapse
|