The first examples of intramolecular addition of primary amidyl radicals to olefins are described. Amidyl radicals were generated from N-(phenylthio) amides in refluxing benzene using a catalytic amount of 2, 2'-azobis (isobutyronitrile)(5 mol%) and tributyltin hydride (~ 2.2 equiv.). The resulting yields of cyclic products ranged from 63% to 85%. Key words: radical cyclization, amidyl radicals, nitrogen heterocycles.
