Hypervalent Iodine Mediated Oxidative Cyclization of Arenecarbaldehyde-1, 3-Benzothiazol-2-yl Hydrazones: An Efficient Synthesis of-3-Aryl-1, 2, 4-Triazolo[3, 4-b]-1, 3-Benzothiazoles

摘要

Arenecarbaldehyde-1, 3-benzothiazol-2-ylhydrazones underwent ring closure with hypervalent iodine (iodobenzene diacetate/phenyliodine bis(trifluoroacetate) to 3-aryl-1, 2, 4-triazolo[3, 4-b]-1, 3-benzothiazole in dichloromethane. All reactions were carried out at room temperature. Phenyliodine bis(trifluoroacetate) gave high yield of triazole derivatives in short reaction time as compared to iodobenzene diacetate.