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Efficient Synthesis of Coumarin-Fused Pyrazolo[3,4- b]pyridine Derivatives Catalyzed by Niobic Acid Modified with Phosphoric Acid under Microwave Irradiation
Lin Wei, Zhuang Cangwei, Hu Xiuxiu, Yang Fengli
Chinese Journal of Organic Chemistry . 2020, (2): 408 -416 .  DOI: 10.6023/cjoc201907026