Unexpected Formation of 2,1-Benzisothiazol-3-ones from Oxathiolano Ketenimines: A Rare Tandem Process
作者:Mateo Alajarin、Baltasar Bonillo、Pilar Sanchez-Andrada、Angel Vidal、Delia Bautista
DOI:10.1021/ol9001416
日期:2009.3.19
A rare one-pot reaction, a tandem [1,5]-H shift/1,5 electrocyclization/[3 + 2] cycloreversion process, leading from N-[2-(1,3-oxathiolan-2-yl)]phenyl ketenimines to 1-(beta-styryl)-2,1-benzisothiazol-3-ones and ethylene, is disclosed and mechanistically unraveled by means of a computational DFT study. The two latter stages of the tandem process are calculated to occur in a single mechanistic step via a transition structure of pseudopericyclic characteristics.