Sonogashira cross-coupling reactions of 3,5-dibromo-2,6-dichloropyridine

Org Biomol Chem. 2017 Feb 7;15(6):1510-1520. doi: 10.1039/c6ob02264b.

Abstract

A new method for the chemoselective synthesis of alkynylpyridines from 3,5-dibromo-2,6-dichloropyridine has been developed. Optimized conditions give access to a variety of mono-, di-, tri- and tetraalkynylated pyridines in good yields. Interestingly, the employment of 3,5-dibromo-2,6-dichloropyridine as a starting material led to the opposite regioisomers of dialkynylated pyridines as compared to the application of 2,3,5,6-tetrachloropyridine.