A facile and inexpensive method for the synthesis of 2-substituted benzothiazoles has been developed by Na2S2O4-mediated cyclocondensations of 2,2＇-disulfanediyldianilines with aldehydes. In the presence of Na2S2O4 and 4 ,A molecular sieves, a variety of 2-substituted benzotbiazoles were obtained from the reaction of 2,2＇-disulfanediyldianilines with aldehydes in moderate to high yields.
