Abstract 2-(1-Alkoxyvinyl)-1, 3-thiazolidines reacted with H 2 O or D 2 O in the presence of 105 mol% of p-toluenesulfonic acid or trifluoroacetic acid (20° C, 1 h) to give 2-acetyl-1, 3- thiazolidine in quantitative yield. 2-(1-Alkoxyvinyl)-3, 5-diphenylimidazolidines underwent hydrolysis in the presence of 20 mol% of an acid (20° C, 24 h) at the vinyloxy group with high regioselectivity yielding 2-acetylimidazolidines. Hydrolysis of 2-(1-alkoxyvinyl)-3- ...
