Ye L, Haddadin MJ, Lodewyk MW, Ferreira AJ, Fettinger JC, Tantillo DJ, Kurth MJ. Cyclopenta[b]pyrroles from triazines: synthetic and mechanistic studies.
Org Lett 2010;
12:164-7. [PMID:
19961148 DOI:
10.1021/ol902559u]
[Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
The pyrrolidine-mediated reactions of 3,5-disubstituted 1,2,4-triazines with cyclobutanone lead to cyclopenta[b]pyrroles, which can be derivatized into hydrazones and oximes. The cyclopenta[b]pyrrole ring system likely arises through a tandem [4 + 2] cycloaddition/cycloreversion/ring rearrangement reaction. In contrast, 3,6-disubstituted 1,2,4-triazines undergo a simple nucleophilic 1,4-addition with cyclobutanone to give 1:1 adducts.
Collapse