Kh. Reddy et al., SYNTHESIS OF ALKYL ARYL SUBSTITUTED PYRAZOLO[1,5-A]PYRIMIDINES, Indian journal of chemistry. Sect. B: organic chemistry, including medical chemistry, 32(5), 1993, pp. 586-589
The reaction of 5-amino-1H-pyrazole-4-carboxamide (1) with acyclic and
cyclic ketones furnishes the alkyl and aryl substituted pyrazolo[1,5-
a]pyrimidines either in polyphosphoric acid (PPA) or under thermal con
dition.