Asymmetric Trasformation of Symmetrical Epoxides to Allylic Alcohols by Lithium (<i>S</i>)-2-(<i>N</i>,<i>N</i>-Disubstituted aminomethyl)pyrrolidide
作者:Masatoshi Asami
DOI:10.1246/bcsj.63.721
日期:1990.3
Enantioselective deprotonation of symmetrical epoxides was studied by using chiral lithium amide, prepared from (S)-2-(N,N-disubstituted aminomethyl)pyrrolidine and butyllithium. Chiral allylic alcohols were obtained with moderate to high enantiomeric excesses (ee’s) (41–92% ee) from several cyclic and acyclic epoxides employing lithium (S)-2-(1-pyrrolidinylmethyl)pyrrolidide in tetrahydrofuran (THF) in the presence of 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU).
使用由(S)-2-(N,N-二取代氨基甲基)吡咯烷和丁基锂制备的手性锂胺,研究了对称环氧化物的对映选择性去质子化反应。通过在四氢呋喃(THF)中采用锂(S)-2-(1-吡咯啉甲基)吡咯化锂并加入1,8-二氮杂双环[5.4.0]十一碳-7-烯(DBU)的条件,从若干环状和非环状环氧化物中获得了具有中等至高度对映体过剩(ee's)(41-92% ee)的手性烯丙醇。