Nucleophilic addition of 3,3,3-trifluoropropynyllithium to d-glyceraldimine: Concise synthesis of both enantiomers of 5,5,5-trifluoronorvaline
作者:Qi Chen、Xiao-Long Qiu、Feng-Ling Qing
DOI:10.1016/j.jfluchem.2007.02.010
日期:2007.10
d-glyceraldimine 2 to give trifluoromethylated propargylic amine 4 in 55% yield. Starting from the key intermediate 4, Boc-protected (R)-5,5,5-trifluoronorvaline and (S)-5,5,5-trifluoronorvaline were concisely synthesized over three steps in 62% and 63% yield, respectively.
3,3,3- Trifluoropropynyllithium,原位进行处理2-溴-3,3,3-三氟-1-丙烯的生成1与2.0当量。在-78℃下用LDA-丙二胺2捕集30μlLDA ,以55%的收率得到三氟甲基化的炔丙基胺4。从关键中间体4开始,通过三个步骤简明地合成了Boc保护的(R)-5,5,5-三氟正缬氨酸和(S)-5,5,5-三氟正缬氨酸,产率分别为62%和63%。