Asymmetric conjugate addition reaction by the use of ()-γ-trityloxymethyl-γ-butyrolactam as a chiral auxiliary
作者:Kiyoshi Tomioka、Toshiro Suenaga、Kenji Koga
DOI:10.1016/s0040-4039(00)84021-6
日期:1986.1
(S)-γ-Trityloxymethyl-γ-butyrolactam (2) serves as a chiral auxiliary in the conjugate addition reaction of the corresponding imide (3) of α,β-unsaturated carboxylic acids with Grignard reagents in the presence of CuBrSMe2 in THF to give, after hydrolysis, the β,β-disubstituted carboxylic acids (5) with predictable absolute configuration and high enantiomeric excess.
(S)-γ三苯甲氧基甲基γ丁内酰胺(2)用作手性助剂在相应的酰亚胺(的共轭加成反应3 α的),β不饱和羧酸在CuBrSMe的存在下羧酸与格氏试剂2在THF中水解后,得到具有可预测的绝对构型和高对映体过量的β,β-二取代的羧酸(5)。