Yadav B, Baire B. Ag(I)-Promoted, Diastereoselective Cyclo-isomerization of
N-Alkynyl-7-azaindole-2-carbinols. Selective Synthesis of
syn-1,2-Diarylpyrrolo[1,2-
a]indol-3-ones and (
Z)-8-Benzylideneoxazolo[3',4'':1,5]pyrrolo[2,3-
b]pyridines.
Org Lett 2022;
24:5450-5455. [PMID:
35834489 DOI:
10.1021/acs.orglett.2c02179]
[Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The design and development of an Ag(I)-promoted, highly diastereoselective cycloisomerization strategy for the synthesis of syn-1,2-diarylpyrrolo[1,2-a]indol-3-ones from N-alkynyl-indole-2-carbinols is reported. The H218O control experiment and identification of 18O-labeled product suggested the involvement of an external water. The 7-azaindole substrates showned a distinct reactivity to give the (Z)-8-benzylideneoxazolo[3',4':1,5]pyrrolo[2,3-b]pyridines. Key features of this strategy are its 100% atom economy, access to important heterocycles, diverse substrate scope, yields up to 95%, operationally simple procedure, and distinct reactivity of indole vs 7-azaindoles.
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