摘要:
3-Methyl-1-(6-methyl-2-methylsulfanylpyrimidin-4-yl)-1H-pyrazol-5-ol available via cyclocondensation of 6-methyl-2-methylsulfanylpyrimidin-4-ylhydrazine with ethyl acetoacetate reacted with aromatic aldehydes to give two kinds of products, 4-arylmethylidene-5-oxo-4,5-dihydropyrazole and arylbis(5-hydroxypyrazol-4-yl)methane derivatives, depending on the substituent in the aromatic aldehyde.