作者:Seiichi Nakamura、Hiroki Sato、Yuuki Hirata、Nobuhide Watanabe、Shunichi Hashimoto
DOI:10.1016/j.tet.2005.09.030
日期:2005.11
quaternary stereogenic centers by a Sn(OTf)2-promoted aldol coupling reaction between an α-keto ester and a silyl ketene thioacetal derived from l- and d-tartaric acids, respectively, (2) the direct introduction of lithium acetylide as the C1 side chain equivalent onto the fully functionalized aldehyde, and (3) construction of the bicyclic core structure by acid-catalyzed internal ketalization under kinetically
描述了一种通过收敛策略合成泽拉果酸C的主要特征,其中包括(1)通过Sn(OTf)2促进的α-酮之间的醛醇偶合反应同时生成C4和C5季生立体中心。分别衍生自l-和d-酒石酸的酯和甲硅烷基烯酮硫缩醛,(2)将作为C1侧链等价基团的乙炔锂直接引入到完全官能化的醛中,以及(3)通过动力学控制条件下酸催化的内部缩酮化反应。