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

Albert Lévai1,* and József Jekő2

1 Department of Organic Chemistry, University of Debrecen, P.O. Box 20, H 4010 Debrecen, Hungary
2 Department of Chemistry, College of Nyíregyháza, Sóstói u. 31/b, H 4400 Nyíregyháza, Hungary

* Corresponding author: E-mail: alevai@puma.unideb.hu

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.

Keywords: 3-Arylidenechromanones, 3-Arylidene-1-thiochromanones, (4-Carboxyphenyl)hydrazine, pyrazolines