Avadhani A, Iniyavan P, Acharya A, Gautam V, Chakrabarti S, Ila H. Aza-Annulation of 1,2,3,4-Tetrahydro-β-carboline Derived Enaminones and Nitroenamines: Synthesis of Functionalized Indolizino[8,7-
b]indoles, Pyrido[1,2-
a:3,4-
b']diindoles, Indolo[2,3-
a]quinolizidine-4-ones and Other Tetrahydro-β-carboline Fused Heterocycles.
ACS OMEGA 2019;
4:17910-17922. [PMID:
31681901 PMCID:
PMC6822222 DOI:
10.1021/acsomega.9b02957]
[Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/11/2019] [Accepted: 10/02/2019] [Indexed: 06/10/2023]
Abstract
Aza-annulation of novel 1,2,3,4-tetrahydro-β-carboline derived enaminones and nitroenamines with various 1,2- and 1,3-bis electrophiles, such as oxalyl chloride, maleic anhydride, 1,4-benzoquinone, 3-bromopropionyl chloride, itaconic anhydride, and imines (from formaldehyde and primary amines), has been investigated. These methodologies provide simple one-step pathways for efficient construction of highly functionalized tetrahydro-β-carboline 1,2-fused, five- and six-membered heterocyclic frameworks, such as indolizino[8,7-b]indoles, pyrido[1,2-a:3,4-b']diindoles, indolo[2,3-a]quinolizidines, and pyrimido[1',6':1,2]pyrido[3,4-b]indoles, which are core structures of many naturally occurring indole alkaloids with diverse bioactivity.
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