作者:Robert S. Coleman、Srinivas Reddy Gurrala、Soumya Mitra、Amresh Raao
DOI:10.1021/jo051525i
日期:2005.10.1
Full details of the asymmetric total syntheses of the dibenzocyclooctadiene lignans interiotherin A, angeloylgomisin R, gomisin O, and gomisin E (epigomisin O) are presented. The syntheses were based on a unified synthetic strategy involving a novel crotylation using the Leighton auxiliary that occurred with excellent asymmetric induction (>98:2 enantiomeric ratio), a diastereoselective hydroboration/Suzuki−Miyaura
介绍了二苯并环辛二烯木脂素interotherotherin A,当归基gomisin R,gomisin O和gomisin E(epigomisin O)的不对称总合成的全部细节。合成基于统一的合成策略,该策略涉及使用Leighton助剂进行新的丁酰化,并具有出色的不对称诱导(> 98:2对映体比率),非对映选择性硼氢化/ Suzuki-Miyaura偶联反应序列以及对映非对映选择性联芳基铜酸酯偶联,其中发生了全部(> 20:1)立体声控制。从简单的芳香族前体分六步到八步完成了合成。