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- [48] Synthesis of methyl 4-aryl-6-methyl-4,7-dihydro-1H-pyrazolo[3,4-b]pyridine-5-carboxylates from methyl 4-aryl-6-methyl-2-oxo-1,2,3,4-tetrahydropyridine-5-carboxylates JOURNAL OF THE CHEMICAL SOCIETY-PERKIN TRANSACTIONS 1, 1996, (09): : 947 - 951