Synthesis of 3-Phenylbenzo[g][1]Benzopyrano[4,3-e]Indazol-8(3H)-Ones and Benzo[b]Phenanthro[9,10-d]Pyran-9-Ones by Photooxidation of 3-Aryl-4-(1-Phenyl-1H-Pyrazol-4-YL)Coumarins and 3,4-Diarylcoumarins

Abstract

Abstract 3-Aryl-4-(1-phenyl-1H-pyrazol-4-yl) coumarins (4) and 3,4-diarylcoumarins (5) were synthesised by reaction of 1-phenyl-4-(2′-hydroxybenzoyl) pyrazoles (1) and 2-hydroxybenzophenone (2) respectively with arylacetyl chlorides (3) under Phase Transfer Catalysis conditions. These Coumarins 4 & 5 were further subjected to photooxidation to give title compounds 6 & 7.