First Enantiocontrolled Formal Synthesis of (+)-Neovibsanin B, A Neurotrophic Diterpenoid
作者:Tomoyuki Esumi、Takehiro Mori、Ming Zhao、Masao Toyota、Yoshiyasu Fukuyama
DOI:10.1021/ol902960n
日期:2010.2.19
formal synthesis of (+)-neovibsanin B has been achieved by a sequence that applies an asymmetric 1,4-addition of (H2C═CH)2Cu(CN)Li2 to trisubstituted α,β-carboxylic acid derivative 1 to induce the chirality at the C-11 all-carbon quaternary center. Together with a modified Negishi cyclic carbopalladation-carbonylative esterification tandem reaction for constructing the A-ring, the synthesis was completed
通过将(H 2 C + CH)2 Cu(CN)Li 2不对称地1,4-加成到三取代的α,β-羧酸衍生物上的序列,实现了对(+)-新诺布沙宁B的对映体控制形式合成。1在C-11全碳四元中心诱导手性。与用于构建A环的改良的Negishi环状碳环羰基化-羰基化酯化串联反应一起,完成了合成。