Abstract
A new strategy for the synthesis of (E)-4-benzylidene-4,5-dihydro-1H-pyrazoles through tandem intermolecular addition–intramolecular cyclization of N-propargylic sulfonylhydrazones has been developed. In this study, we firstly report that N-propargylic sulfonylhydrazones react with electrophilic reagents to afford 4-substituted pyrazole derivatives.
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