Regioselectivity in the Reactions of Bis-hydrazonoyl Halides with Pyrimidine-2-thiones
摘要:
Bis-hydrazonoyl chlorides react regioselectively with pyrimidine-2-thiones, which contain a masked thiourea residue, to give the hitherto unknown annelated 2,3-bis-arylhydrazono thiazoles and 3,3 ' -bis-1,2,4-triazoles. Reaction of bis-hydrazonoyl chlorides with 2-methylthio derivatives gave only 3,3 ' -bis-1 2,4-triazoles.