Highly stereoselective titanium-mediated aldol reactions from chiral α-silyloxy ketones. A reliable tool for the synthesis of natural products
作者:Judit Esteve、Carme Jiménez、Joaquim Nebot、Javier Velasco、Pedro Romea、Fèlix Urpí
DOI:10.1016/j.tet.2011.06.019
日期:2011.8
Chiral α-silyloxy ketones participate in highly stereoselective TiCl4-mediated aldol reactions that afford diastereomerically pure syn–syn adducts in high yield irrespective of the R1 and R2 substituents flanking the carbonyl or the silicon protecting group. Further manipulation of the resulting aldol adducts provide in a straightforward manner highly functionalized fragments that facilitate the synthesis
手性α-甲硅烷氧基酮参与高度立体选择性的TiCl 4介导的醛醇缩合反应,无论羰基或硅保护基旁的R 1和R 2取代基如何,都能以高收率获得非对映体纯的syn - syn加合物。所得醛醇加合物的进一步处理以直接的方式提供了高度官能化的片段,其促进了天然产物的合成。