作者:Georg Kneer、Jochen Mattay
DOI:10.1016/s0040-4039(00)74714-9
日期:1992.12
selectivities are observed in additions of alkyl radicals to the chiral (c,d) olefin (2S)-2-tert-butyl-5-ethoxycarbonylmethylene-1,3-dioxolane-4-one1. The following hydrogen abstraction from tributylstannane proceeds with excellent asymmetric stereocontrol, leading to two of four possible diastereoisomers with high diastereomeric excesses. Additions of chiral radicals obtained from (2R,5R)-5-alkyl-5-bromo-1
在手性(c,d)烯烃(2 S)-2-叔丁基-5-乙氧基羰基亚甲基-1,3-二氧戊环-4-酮1上添加烷基后,观察到适度的面部选择性。随后从三丁基锡烷提取氢的过程具有出色的不对称立体控制,从而导致四种可能的非对映异构体中的两个具有高非对映异构体过量度。由(2 R,5 R)-5-烷基-5-溴-1,3-二氧戊环-4-酮获得的手性基团向丙烯酸乙酯的加成表现出高度的不对称1,3-诱导作用。