Sulfanyl radical addition to alkynyl azides: An insight into vinyl radical cyclization onto the azido function

Article abstract of DOI:10.1016/S0040-4039(97)10045-4

5-Exo-Cyclization of 2-sulfanylvinyl radicals 16 and 21 is a fast process which prevents intramolecular addition to the sulfanyl aromatic ring and hydrogen abstraction. In contrast, the 2-sulfanylvinyl radicals 3 and 9 are reluctant to add to their alipha