Shuvalov VY, Vlasova EY, Zheleznova TY, Fisyuk AS. New one-pot synthesis of 4-arylpyrazolo[3,4-
b]pyridin-6-ones based on 5-aminopyrazoles and azlactones.
Beilstein J Org Chem 2023;
19:1155-1160. [PMID:
37560137 PMCID:
PMC10407779 DOI:
10.3762/bjoc.19.83]
[Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2023] [Accepted: 07/14/2023] [Indexed: 08/11/2023] Open
Abstract
An effective one-pot strategy was developed for the synthesis of 4-arylpyrazolo[3,4-b]pyridin-6-ones from pyrazolo[3,4-b]pyridin-6-ones, obtained by reacting 5-aminopyrazoles with 4-arylidene-2-phenyloxazol-5(4H)-ones (azlactones) under solvent-free conditions, through subsequent elimination of a benzamide molecule in a superbasic medium (t-BuOK/DMSO). The fluorescent properties of the synthesized compounds were studied. 4-Arylpyrazolo[3,4-b]pyridin-6-ones luminesce in the region of 409-440 nm with a quantum yield of 0.09-0.23 when irradiated with UV light.
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