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30μl
LDA ,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%。