AgSbF6-Mediated Selective Thiolation and Selenylation at C-4 Position of Isoquinolin-1(2 H)-ones.

A new and facile AgSbF6-mediated protocol for the construction of C-4 thiolated or selenylated isoquinolin-1(2 H)-ones via a radical pathway was established. This reaction proceeded efficiently with excellent regioselectivity, a broad substrate scope, and good functional group tolerance. A radical reaction mechanism involving thiyl radicals as key intermediates is proposed for the present transformation.