Vaskevych AI, Savinchuk NO, Vaskevych RI, Rusanov EB, Grygorenko OO, Vovk MV. The PIFA-initiated oxidative cyclization of 2-(3-butenyl)quinazolin-4(3
H)-ones - an efficient approach to 1-(hydroxymethyl)-2,3-dihydropyrrolo[1,2-
a]quinazolin-5(1
H)-ones.
Beilstein J Org Chem 2021;
17:2787-2794. [PMID:
34900009 PMCID:
PMC8630437 DOI:
10.3762/bjoc.17.189]
[Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2021] [Accepted: 11/16/2021] [Indexed: 01/15/2023] Open
Abstract
A regioselective method for the synthesis of 1-(hydroxymethyl)-2,3-dihydropyrrolo[1,2-a]quinazolin-5(1H)-ones - close structural analogs of naturally occurring vasicinone alkaloids - is described. The procedure is based on PIFA-initiated oxidative 5-exo-trig cyclization of 2-(3-butenyl)quinazolin-4(3Н)-ones, in turn prepared by thermal cyclocondensation of the corresponding 2-(pent-4-enamido)benzamides. The products obtained have a good natural product likeness (NPL) score and therefore can be useful for the design of natural product-like compound libraries.
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