Abstract
2-Aminobenzenethiol and an aryl aldehyde reacted to give a benzothiazoline via an imine intermediate, and the benzothiazoline was aromatized by oxygen or hydrogen peroxide to give a high yield of 2-arylbenzothiazole in the presence of a catalytic amount of scandium triflate Sc(OTf) 3 . The intermediary benzothiazoline was isolated and allowed to react with O 2 or H 2 O 2 in the presence of Sc(OTf) 3 , and the Lewis acid was found to also catalyze the oxidative process other than the ring closing step.
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