Sam. Metwally et al., REACTIVITY OF 3-METHYL-1-PHENYL-2-PYRAZOLINE-4,5-DIONE WITH AMINES, Indian journal of chemistry. Sect. B: organic chemistry, including medical chemistry, 34(3), 1995, pp. 248-250
Reaction of 3-methyl-1-phenyl-2-pyrazoline-4, 5-dione (1) with amine o
r diamine derivatives has been investigated. Primary aliphatic amines
or diamines with alpha-hydrogens react with 1 to give rubazonic acid (
7), while 1 with amines substituted in alpha-position addition product
s are formed which yield Schiff bases on heating. Aromatic o-diamines
react with 1 to give different heterocyclic derivatives.