Thermal and Photochemical Investigation of the Reaction of Indole-2,3-dione with Pyrazolone

Abstract

Some novel reactions of indole-2,3-dione with pyrazolone under thermal and photochemical conditions have been studied. Under thermal conditions, a variety of novel compounds viz. 1,3-dihydro-3-[(3'-methyl-5'-oxo-1'-phenylpyrazolidene)]-2H-indol-2-one, 3,5-dimethyl-1,7-diphenylspiro[dipyrazolo(3,4-b ; 4,3-e)pyran-4(4H),3'(3H)indol]-2'[1'H]-one, and 5-fluoro-3,3-bis(3'-methyl-5'-oxo-1'-phenylpyrazol-4'-yl)indol-2[1H]-one were obtained