Asymmetric Heck Reaction−Carbanion Capture Process. Catalytic Asymmetric Total Synthesis of (−)-Δ<sup>9(12)</sup>-Capnellene
作者:Takashi Ohshima、Katsuji Kagechika、Midori Adachi、Mikiko Sodeoka、Masakatsu Shibasaki
DOI:10.1021/ja9609359
日期:1996.1.1
An asymmetric Heck reaction−carbanion capture process was realized for the first time, making possible the catalytic asymmetric synthesis of various functionalized bicyclo[3.3.0]octane derivatives 6 in up to 94% ee. Sodium bromide had interesting effects on this asymmetric Heck reaction−carbanion capture process, and these effects were useful for improving the enantiomeric excess. Furthermore, the
首次实现了不对称 Heck 反应-碳负离子捕获过程,使催化不对称合成各种官能化双环 [3.3.0] 辛烷衍生物 6 成为可能,最高 94% ee。溴化钠对这种不对称 Heck 反应 - 碳负离子捕获过程具有有趣的影响,这些影响有助于改善对映体过量。此外,首次实现了(-)-Δ9(12)-capnellene (7)的催化不对称合成,以6b为关键中间体,自由基环化为关键步骤。