Mari G, De Crescentini L, Favi G, Santeusanio S, Mantellini F. A facile protocol for the preparation of 2-carboxylated thieno [2,3-
b] indoles: a
de novo access to alkaloid thienodolin.
Org Biomol Chem 2022;
20:4167-4175. [PMID:
35531860 DOI:
10.1039/d2ob00440b]
[Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A metal-free strategy, alternative to the known complex cycloaddition reactions, towards 2-carboxylated thieno [2,3-b] indole derivatives has been successfully developed. The novel approach involves as starting materials easy accessible 1,2-diaza-1,3-dienes and indoline 2-thione and requires mild reaction conditions. Furthermore, the easy work-up required makes this method amenable for a one-pot approach as demonstrated in the preparation of thienodolin, a natural product isolated from Streptomyces albogriseolus that exhibits valuable biological properties.
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