Vinyl bromides derivedfrom 2-alkylidene-4-oxothiazolidines represent a class of vinyl halides, which readily undergo a bromophilic attack by a range of nucleophiles. With Ph3P, AcS−, CN−, I−, F−, Ac2CH− and N3− the attack ends up with reductive debromination, whereas the bromine substitution takes place with KSCN. When acetate anion and organic bases, such as pyridine, Et3N or morpholine, are employed
Carbon–bromine cleavage by dimethyl sulfoxide: the key step of C(5) functionalization of push–pull 2-alkylidene-4-oxothiazolidine vinyl bromides
作者:Marija Baranac Stojanović、Rade Marković
DOI:10.1016/j.tetlet.2007.01.051
日期:2007.3
Push–pull 2-alkylidene-4-oxothiazolidine vinyl bromides undergo efficient C(5) functionalization through DMSO-assisted carbon–bromine cleavage, followed by a bromine transfer-substitution (or elimination) sequence. A mechanism for this novel transformation is proposed.