Catalyst free annulative thioboration of unfunctionalized olefins

Abstract

A direct and catalyst-free annulative thioboration of unfunctionalized olefins has been developed. In the presence of BCl₃ as the sole boron source, the boryl group and thiol group are added to the C–C double bonds simultaneously. The boronic acids obtained can be protected to form synthetically ubiquitous pinacol boronate esters.