A Convenient Method to Obtain 4,5-Dihydro-<i>1H</i>-Methylpyrazoles by A Ring Transformation Reaction
作者:Helio Gauze Bonacorso、Arci Dirceu Wastowski、Nilo Zanatta、Marcos Antonio Pinto Martins
DOI:10.1080/00397910008087174
日期:2000.4
Abstract A convenient method for the synthesis of alkyl[aryl]-substituted 5-hydroxy-5-trifluoromethyl-4,5-dihydro-1H-1-methylpyrazole (2) from a new ring transformation reaction of alkyl[aryl]-substituted-5-hydroxy-5-trifluoromethyl-4,5-dihydro-1H-1-pyrazolethiocarboxyamide (1) with methylhydrazine in THF, and the thermal dehydration of 2, are reported.
摘要 一种由烷基[芳基]-取代-的新环转化反应合成烷基[芳基]-取代的5-羟基-5-三氟甲基-4,5-二氢-1H-1-甲基吡唑(2)的简便方法报道了 5-羟基-5-三氟甲基-4,5-二氢-1H-1-吡唑硫代羧酰胺 (1) 与甲基肼在 THF 中的反应,以及 2 的热脱水。