Usachev SA, Nigamatova DI, Mysik DK, Naumov NA, Obydennov DL, Sosnovskikh VY. 2-Aryl-6-Polyfluoroalkyl-4-Pyrones as Promising R
F-Building-Blocks: Synthesis and Application for Construction of Fluorinated Azaheterocycles.
Molecules 2021;
26:4415. [PMID:
34361567 PMCID:
PMC8347980 DOI:
10.3390/molecules26154415]
[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: 06/28/2021] [Revised: 07/17/2021] [Accepted: 07/19/2021] [Indexed: 11/18/2022] Open
Abstract
A convenient and general method for the direct synthesis of 2-aryl-6-(trifluoromethyl)-4-pyrones and 2-aryl-5-bromo-6-(trifluoromethyl)-4-pyrones has been developed on the basis of one-pot oxidative cyclization of (E)-6-aryl-1,1,1-trifluorohex-5-ene-2,4-diones via a bromination/dehydrobromination approach. This strategy was also applied for the preparation of 2-phenyl-6-polyfluoroalkyl-4-pyrones and their 5-bromo derivatives. Conditions of chemoselective enediones bromination were found and the key intermediates of the cyclization of bromo-derivatives to 4-pyrones were characterized. Synthetic application of the prepared 4-pyrones has been demonstrated for the construction of biologically important CF3-bearing azaheterocycles, such as pyrazoles, pyridones, and triazoles.
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