1
|
Lu DL, Yao YY, Liang YF, Liang C, Lei L, Ma L, Mo DL. Synthesis of Tetrahydro-5 H-indolo[2,3- b]quinolines through Copper-Catalyzed Cascade Reactions of Aza- o-quinone Methides with Indoles. J Org Chem 2023; 88:690-700. [PMID: 36485009 DOI: 10.1021/acs.joc.2c02140] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
A variety of tetrahydro-5H-indolo[2,3-b]quinolines were prepared in 40-97% yields through a copper(II)-catalyzed cascade reaction of aza-o-quinone methides generated in situ from 2-(chloromethyl)anilines and indoles. Experimental results showed that the reaction underwent double 1,4-additions and sequential intramolecular cyclization. The present method features broad substrate scope, good functional group tolerance, and easy gram scalable preparation of indolo[2,3-b]quinolines.
Collapse
Affiliation(s)
- Dong-Liu Lu
- State Key Laboratory for Chemistry and Molecular Engineering of Medicinal Resources, Collaborative Innovation Center for Guangxi Ethnic Medicine, School of Chemistry and Pharmaceutical Sciences, Guangxi Normal University, 15 Yu Cai Road, Guilin 541004, China
| | - Yi-Yun Yao
- State Key Laboratory for Chemistry and Molecular Engineering of Medicinal Resources, Collaborative Innovation Center for Guangxi Ethnic Medicine, School of Chemistry and Pharmaceutical Sciences, Guangxi Normal University, 15 Yu Cai Road, Guilin 541004, China
| | - Yu-Feng Liang
- State Key Laboratory for Chemistry and Molecular Engineering of Medicinal Resources, Collaborative Innovation Center for Guangxi Ethnic Medicine, School of Chemistry and Pharmaceutical Sciences, Guangxi Normal University, 15 Yu Cai Road, Guilin 541004, China.,College of Chemistry and Environment Engineering, Baise University, 21 Zhongshan Second Road, Baise, 533000, China
| | - Cui Liang
- State Key Laboratory for Chemistry and Molecular Engineering of Medicinal Resources, Collaborative Innovation Center for Guangxi Ethnic Medicine, School of Chemistry and Pharmaceutical Sciences, Guangxi Normal University, 15 Yu Cai Road, Guilin 541004, China
| | - Lu Lei
- College of Chemistry and Environment Engineering, Baise University, 21 Zhongshan Second Road, Baise, 533000, China
| | - Lu Ma
- College of Chemistry and Environment Engineering, Baise University, 21 Zhongshan Second Road, Baise, 533000, China
| | - Dong-Liang Mo
- State Key Laboratory for Chemistry and Molecular Engineering of Medicinal Resources, Collaborative Innovation Center for Guangxi Ethnic Medicine, School of Chemistry and Pharmaceutical Sciences, Guangxi Normal University, 15 Yu Cai Road, Guilin 541004, China
| |
Collapse
|
2
|
Nam S, Kim I. Cu-Catalyzed Ullmann-Type Double C-N Coupling Approach to 5-Aryl-5 H-indolizino[3,2- b]indoles. J Org Chem 2023; 88:745-754. [PMID: 36494330 DOI: 10.1021/acs.joc.2c02517] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
A modular approach to a polyfunctionalized 5H-indolizino[3,2-b]indole, an indolizine-indole fused system, was achieved from readily available pyridine-2-acetonitrile, 2-bromobenzaldehyde, and TMSCN via the strategic combination of a one-pot three-component assembly and Cu-catalyzed Ullmann-type double C-N coupling reactions through which five new bonds (two C-C and three C-N) were formed in two steps.
Collapse
Affiliation(s)
- Seonghyeon Nam
- College of Pharmacy and Yonsei Institute of Pharmaceutical Sciences, Yonsei University, 85 Songdogwahak-ro, Yeonsu-gu, Incheon 21983, Republic of Korea
| | - Ikyon Kim
- College of Pharmacy and Yonsei Institute of Pharmaceutical Sciences, Yonsei University, 85 Songdogwahak-ro, Yeonsu-gu, Incheon 21983, Republic of Korea
| |
Collapse
|
3
|
Langer P. Synthesis of Nitrogen Heterocycles by a C–C Cross-Coupling/Cycloisomerization Strategy. Synlett 2022. [DOI: 10.1055/s-0042-1751352] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
Abstract
AbstractThe present article presents a personalized Account on the synthesis of nitrogen heterocycles by combination of regioselective Pd-catalyzed cross-coupling reactions of polyhalogenated heterocycles, i.e., Suzuki–Miyaura and Sonogashira reactions, with acid-mediated cycloisomerization reactions. In many cases, the products constitute new heterocyclic core structures and show interesting optical and electronic properties.1 Introduction2 Acridines3 Phenathridines4 Azapyrenes5 Thienoquinolines6 Pyrrolonaphthyridines7 6-Aza-ullazines8 Conclusions
Collapse
Affiliation(s)
- Peter Langer
- Institut für Chemie, Universität Rostock
- Leibniz-Institut für Katalyse an der Universität Rostock e. V
| |
Collapse
|
4
|
Abstract
AbstractThe present article presents a personalized Account on the synthesis of nitrogen heterocycles by domino C–N coupling/hydroamination reactions and related processes. The starting materials, 2-alkynyl-1-halohetarenes, are regioselectively available by Sonogashira reactions of various 1,2-dihalogenated heterocycles, such as thiophenes, benzothiophenes, furans and benzofurans, pyridines, quinolines, pyrimidines, and other ring systems. More complex products are formed by domino C–N coupling/hydroamination/C–H arylation reactions of 2-alkynyl-1-halohetarenes with 2-bromoanilines. In these reactions, not only two, but three bonds are formed in one step. In many cases, the products constitute new heterocyclic core structures and show interesting pharmacological or fluorescence properties.1 Introduction2 Domino C–N Coupling/Hydroamination Reactions3 Domino C–N Coupling/Hydroamination/C–H Arylation Reactions4 Conclusions
Collapse
Affiliation(s)
- Peter Langer
- Institut für Chemie, Universität Rostock
- Leibniz-Institut für Katalyse an der Universität Rostock e. V
| |
Collapse
|