Asymmetric Synthesis of (α<i>R</i>)-Polyfluoroalkylated Prolinols Based on the Perfluoroalkyl-Induced Highly Stereoselective Reduction of Perfluoroalkyl <i>N</i>-Boc-pyrrolidyl Ketones
作者:Kazumasa Funabiki、Akitsugu Shibata、Hiroki Iwata、Keisuke Hatano、Yasuhiro Kubota、Kenichi Komura、Masahiro Ebihara、Masaki Matsui
DOI:10.1021/jo8004952
日期:2008.6.1
Reduction of the obtained chiral (S)-tert-butyl 2-(perfluoroalkanoyl)pyrrolidine-1-carboxylate with sodium borohydride or lithium aluminum hydride proceeded smoothly to give the corresponding (S)-tert-butyl 2-((R)-perfluoro-1-hydroxyalkyl)pyrrolidine-1-carboxylate in yields of 73−97% with excellent diastereoselectivities (up to >98% de), compared with the reduction of nonfluorinated (S)-tert-butyl
用硼氢化钠或氢化锂铝将所得的手性(S)-叔丁基2-(全氟烷酰基)吡咯烷-1-羧酸还原反应顺利进行,得到相应的(S)-叔丁基2-((R)-全氟化合物-1-羟基烷基)吡咯烷-1-羧酸盐的收率为73-97%,非对映选择性极好(高达> 98%de),与未氟化的(S)-叔丁基-2-戊酰基吡咯烷-1-羧酸盐的减少相比。