A Green Synthesis of Highly Functionalized 3‐amino‐2‐phenylsulfonyl‐1‐alkyl/aryl‐1<i>H</i>‐pyrazolo[1,2‐<i>b</i>]phthalazine‐5,10‐diones and Their Reduction and Photophysical Studies

Abstract

3‐Amino‐2‐benzenesulfonyl‐1‐alkyl/aryl‐1H‐pyrazolo[1,2‐b]phthalazine‐5,10‐dione derivatives were synthesized by the one‐pot, three‐component condensation of phthalhydrazide, aldehydes, and (phenylsulfonyl)acetonitrile in EtOH using 2‐hydroxyethylammonium acetate as catalyst. The advantages of this method include environmental friendliness, easy work‐up, and excellent yields. The reduction of some products and photophysical properties were also investigated.