作者:Rustam T. Iminov、Alexander V. Mashkov、Ivan I. Vyzir、Bohdan A. Chalyk、Anton V. Tverdokhlebov、Pavel K. Mykhailiuk、Ludmila N. Babichenko、Andrey A. Tolmachev、Yulian M. Volovenko、Angelina Biitseva、Oleg V. Shishkin、Svetlana V. Shishkina
DOI:10.1002/ejoc.201403295
日期:2015.2
3-(methylamino)but-2-enoate with fluorinated acetic acid anhydrides occurred at the enamine carbon atom. The reaction of the resulting tert-butyl 3-(methylamino)-2-(RFCO)but-2-enoates with alkyl hydrazines resulted in mixtures of isomeric pyrazoles that were easily separated by column chromatography. The target fluorinated pyrazole-4-carboxylic acids were obtained on a multigram scale.
3-(甲基氨基)丁-2-烯酸叔丁酯与氟化乙酸酐的酰化发生在烯胺碳原子上。所得的 3-(甲基氨基)-2-(RFCO)but-2-enoates 叔丁酯与烷基肼的反应产生了异构吡唑的混合物,这些混合物很容易通过柱色谱分离。以多克规模获得目标氟化吡唑-4-羧酸。