Efficient synthesis of functionalized 2,4-diaminothiazoles from tetramethylguanidine, isothiocyanates, and α-bromoketones
The Hantzsch method for thiazole synthesis is modified via the reaction of -bromocarbonyl compounds with 2-(amidosulfanylenemethyl)-1,1,3,3- tetramethylguanidines (prepared in situ from tetramethylguanidine and aroylisothiocyanates), to afford functionali