Regioselective Synthesis of Ethyl Pyrazolecarboxylates from Ethyl 3-[(Dimethylamino)methylidene]pyruvate and Diethyl 3-[(Dimethylamino)methylidene]-2-oxosuccinate. Isolation of Ethyl 4,5-Dihydro-1-heteroaryl-5-hydroxy-1H-pyrazole-5-carboxylates as Stable Intermediates in the Pyrazole Ring Formation.

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