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A simple and efficient regiospecific synthesis of 6-trifluoromethyl-1H-pyrazolo[3,4-b]pyridines has been achieved in excellent yields via a three-component reaction between 2-hydrazinobenzothiazoles, α-cyanoacetophenones and trifluoromethyl-β-diketones under solvent-free conditions. This method was found to be more convenient than the classical stepwise solvent mediated process, which furnished not...
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