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Sonogashira cross-coupling reactions of 3,5-dibromo-2,6-dichloropyridine†
Lars Ohlendorf
Organic & Biomolecular Chemistry Pub Date : 01/17/2017 00:00:00 , 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.

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