Synthesis of B-ring-fluorinated (-)-epicatechin gallate derivatives

Org Biomol Chem. 2020 Jun 7;18(21):4024-4028. doi: 10.1039/d0ob00686f. Epub 2020 May 19.

Abstract

The synthesis of enantiomerically pure B-ring fluorinated catechin derivatives is presented. In a convergent approach the chromane was obtained by reaction of a lithiated fluoro-resorcine with an optically active epoxide. The latter was prepared from 3,4-difluorobenzaldehyde by reaction with vinylmagnesium bromide followed by Sharpless epoxidation. The protocol provides access to both fluorinated catechin as well as epicatechin derivatives.