Asymmetric Syntheses of Fused Bicyclic Compounds by Conjugate Additions of Allylic Organolithium Species to Activated Olefins and Subsequent Cyclizations
作者:Sung H. Lim、Michael D. Curtis、Peter Beak
DOI:10.1021/ol007012+
日期:2001.3.1
[reaction: see text]. Addition of the configurationally stable organolithium species produced by enantioselective deprotonation of N-Boc-N-(p-methoxyphenyl) allylamines to alpha,beta-unsaturated carbonyl compounds affords 1,4-addition products in good yields with high diastereomeric and enantiomeric ratios. Further transformations of these compounds provide [3.3.0]-, [4.3.0]-, [5.3.0]-, and [5.4.0]-carbocycles
[反应:请参见文字]。通过将N-Boc-N-(对甲氧基苯基)烯丙胺的对映选择性去质子化反应生成的构型稳定的有机锂物质与α,β-不饱和羰基化合物加成后,可以以高收率和高非对映体和对映体比率得到1,4-加成产物。这些化合物的进一步转化提供了具有高立体选择性的[3.3.0]-,[4.3.0]-,[5.3.0]-和[5.4.0]-碳环和杂环。