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2Nucleophilic substitution reactions in 2-chloropyridines and 2,5-dioxo-1,2,5,7-tetrahydro-1H-furo[3,4-b]pyridines, Chemistry of Heterocyclic Compounds Ethyl 5-amino-3-oxo-1,2-dihydro-1H-pyrazole-1-carboxylate in the selective synthesis of partially hydrogenated pyrazolo[3,4-b]pyridin-3-ones, Chemistry of Heterocyclic Compounds