Cyclocondesation of 3-aryl(heteryl)pyrazole-4-carbaldehydes with ethyl acetoacetate and urea (thiourea) in the presence of FeCl3 · 6H2O afforded 3-aryl(heteryl)-4-(4-pyrazolyl)-1,2,3,4-tetrahydropyrimidin-2-ones(thiones).
3-芳基(杂基)
吡唑-4-
甲醛与
乙酰乙酸乙酯和
脲(
硫脲)在FeCl3·6H2O存在下环缩合得到3-芳基(杂基)-4-(4-
吡唑基)-1,2,3, 4-四氢
嘧啶-2-酮(
硫酮)。