Synthesis of 3-Alkenyl-4-oxo-6,7-dihydro-1H-pyranopyrazole Derivatives
A series of 1-substituted 3-alkenyl-4-oxo-6,7-dihydro-1H-pyranopyrazoles was prepared by reaction of arylhydrazines or benzylhydrazine with 4,5-dioxo-2,3,7,8-tetrahydro-4H,5H-pyranopyran derivatives.