2-(3,5-dimethylphenyl)-5-methyl-2,4-dihydropyrazole-3-one 、
二甲基亚砜 在
lithium bromide monohydrate 、
sodium acetate 作用下,
反应 7.5h,
以73%的产率得到(4Z)-2,4-dihydro-4-[[5-hydroxy-3-methyl-1-(3,5-dimethylphenyl)-1H-pyrazol-4-yl]methylene]-5-methyl-2-(3,5-dimethylphenyl)-3H-pyrazol-3-one