configuration in 81% yield and 96.7% ee, to the best of our knowledge, leading to the most efficient enzymatic desymmetric synthesis of the chiral chroman skeleton of vitamin E members reported to date. Coupled with the modified preparation of the phytol-derived side chain, the chemoenzymatic total synthesis of 1 was completed in 15 longest linear steps with 3.1% overall yield.
手性二醇 ( S ) -14是 (+)-(2 R ,4' R ,8' R )-α-生育酚 ( 1 ) 的常见合成中间体,一种新的高度立体选择性合成方法分七个步骤完成总产率为 13.8%。该开发路线的特点是脂肪酶催化的前手性二酯39a的不对称水解,其通过具有挑战性的 Heck 偶联制备成手性含季碳单酯 ( R ) -37a据我们所知,在 81% 的产率和 96.7% 的正确配置下,导致迄今为止报道的维生素 E 成员的手性色满骨架的最有效的酶促不对称合成。再加上对植醇衍生侧链的修饰制备,1的化学酶促全合成在 15 个最长的线性步骤中完成,总产率为 3.1%。