Synthesis of 4-trifluoromethyl-2 H-chromenes via the reaction of 2-(trifluoroacetyl)phenols with vinyltriphenylphosphonium chloride

Org Biomol Chem. 2022 Aug 31;20(34):6809-6820. doi: 10.1039/d2ob01177h.

Abstract

Substituted on the benzene ring 4-CF3-2H-chromenes have been prepared from substituted 2-(trifluoroacetyl)phenols and vinyltriphenylphosphonium chloride according to the Schweizer protocol in moderate to excellent yields. The influence of the type and the position of aromatic ring substituents on yields of 4-CF3-2H-chromenes have been investigated. It has been shown that 4-CF3-2H-chromenes are convenient precursors to 4-CF3-coumarins.