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The reactive intermediate produced in the reaction between alkyl isocyanides and dialkyl acetylenedicarboxylates was trapped by benzoic acid N′-(2-oxo-2-phenyl-ethyl)hydrazide to yield highly functionalized 2,3-dihydro-1H-pyrazoles in good yields.The reaction is characterized by mild conditions and tolerance to various functional groups.

polycyclic aromatic compounds

Reaction between Benzoic Acid N′-(2-Oxo-2-Phenyl-Ethyl)Hydrazide and Acetylenic Esters in the Presence of Alkyl Isocyanides: One-Pot Synthesis of Highly Functionalized 2,3-Dihydro-1H-Pyrazoles