A Convenient Route to 1-Alkyl-5-trifluoromethyl-1,2,3-triazole-4-carboxylic Acids Employing a Diazo Transfer Reaction
作者:Rustam T. Iminov、Alexander V. Mashkov、Bohdan A. Chalyk、Pavel K. Mykhailiuk、Anton V. Tverdokhlebov、Andrey A. Tolmachev、Yulian M. Volovenko、Oleg V. Shishkin、Svetlana V. Shishkina
DOI:10.1002/ejoc.201300030
日期:2013.5
The reaction of ethyl 3-(alkylamino)-4,4,4-trifluoro-but-2-enoates with mesyl azide in the presence of 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU) gave ethyl 1-alkyl-5-trifluoromethyl-1,2,3-triazole-4-carboxylates in good yields. Further hydrolysis of the ester group afforded the title compounds on a multigram scale.
3-(烷基氨基)-4,4,4-三氟丁-2-烯酸乙酯在1,8-二氮杂双环[5.4.0]十一碳-7-烯(DBU)存在下与甲磺酰叠氮化物反应得到乙基1-烷基-5-三氟甲基-1,2,3-三唑-4-羧酸盐产率良好。酯基的进一步水解得到多克规模的标题化合物。