A Simple Efficient Procedure for the Stereoselective Synthesis of trans-2,3,3a,4-Tetrahydro-3-aryl-2- (4-carboxyphenyl)[1]benzopyrano[4,3-c]pyrazoles and their [1]Benzothiopyrano Analogues

Hitherto unknown group of tricyclic fused pyrazolines have been synthesized by the reaction of 3-arylidenechromanones and 3-arylidene-1-thiochromanones with (4-carboxyphenyl)hydrazine in hot anhydrous pyridine solution. Structures of all new compounds have been elucidated by microanalyses, IR, 1H, 13C NMR and mass spectrometric measurements.