Kinetic Resolution of Racemic Lactones by Conjugate Additions of Allylic Organolithium Species: Direct Formation of Three Contiguous Centers with High Diastereo- and Enantioselectivities
作者:Sung H. Lim、Peter Beak
DOI:10.1021/ol0263898
日期:2002.8.1
[reaction: see text] Kinetic resolution of racemic alpha,beta-unsaturated lactones by the organolithium species produced from asymmetric lithiation of N-Boc-N-(p-methoxyphenyl)cinnamylamine provides conjugate addition products with three contiguous stereogenic centers in yields of 62-77% with diastereomeric ratios from 75:25 to >99:1 and enantiomeric ratios for the major diastereomers from 94:6 to 98:2
[反应:请参阅文本] N-Boc-N-(对甲氧基苯基)肉桂胺的不对称锂化所产生的有机锂物种可动态消解外消旋的α,β-不饱和内酯,可提供具有三个连续立体中心的共轭加成产物,产率为62 -77%的非对映体比例为75:25至> 99:1,主要非对映体的对映体比例为94:6至98:2。