A new approach to the synthesis of 2-aryl-4-halomethyl-5-methyl-1,3- oxazoles by highly regioselective direct halogenation with NBS or NCS/MeCN
A simple and efficient method for the synthesis of 2-aryl-4-bromomethyl-5- methyl-1,3-oxazoles 2 and 2-aryl-4-chloromethyl-5-methyl-1,3-oxazoles 3 is described. The reaction of 2-aryl-4,5-dimethyl-1,3-oxazoles 1 with N-bromosuccinimide and N-chlorosuccini