REACTION OF PYRAZOLE ADDITION TO QUINONES

被引:32
作者
BALLESTEROS, P [1 ]
CLARAMUNT, RM [1 ]
ESCOLASTICO, C [1 ]
MARIA, MDS [1 ]
ELGUERO, J [1 ]
机构
[1] CSIC,INST QUIM MED,E-28006 MADRID,SPAIN
关键词
D O I
10.1021/jo00032a048
中图分类号
O62 [有机化学];
学科分类号
070303 ; 081704 ;
摘要
The reactions of pyrazole, 4-nitropyrazole, 3,5-dimethylpyrazole, and 4-chloro-3,5-dimethylpyrazole with 1,4-benzoquinone in dioxane have been analyzed. Mono- and 2,3-bis-adducts were obtained and only in the case of pyrazole was a 2,5-bis(pyrazol-1-yl)-1,4-dihydroxybenzene formed. Further oxidation of the mono- and bis-adducts with 2,3-dichloro-5,6-dicyano-1,4-benzoquinone (DDQ) afforded the quinones, which in turn added 1 mol of azole (pyrazole and imidazole) to yield tetrapyrazolylquinols. Nitration of the 2,3-bis(pyrazol-1-yl)- and 2,3-bis(3,5-dimethylpyrazol-1-yl)-1,4-dihydroxybenzenes has been performed to prepare the corresponding 4-nitropyrazolyl derivatives.
引用
收藏
页码:1873 / 1876
页数:4
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