Cyclocondensation reactions of the pyrazol-5-amine 1 and the 1-aryl-3-phenyl-2-propen-1-ones 2a-d yield the 6,7-dihydropyrazolo[1,5-a]pyrimidines 7a-d. Whereas 7a-c can be isolated in pure state, 7d is subjected to a spontaneous oxidation.
吡唑-5-胺1和1-芳基-3-苯基-2-丙烯-1-酮2a-d的环缩合反应产生6,7-二氢吡唑并[1,5- a ]嘧啶7a-d。而7A-C可以以纯的状态被分离,7D经受自发氧化。