Formal [3+2] Annulation Involving Allylic Bromides and Thioureas. Synthesis of 2-Iminothiazolidines through a Base-Catalyzed Intramolecular<i>anti</i>-Michael Addition
作者:Misael Ferreira、Marcus M. Sá
DOI:10.1002/adsc.201401026
日期:2015.3.9
A simple and efficient protocol was developed for the synthesis of 2‐iminothiazolidines through a base‐mediated [3+2] annulation involving substituted thioureas and allylic bromides bearing electron‐withdrawing groups. This domino process consists of nucleophilic displacement, followed by intramolecular anti‐Michael addition of the preformed allylic isothiourea under mild conditions to give the thiazolidine