报道了第一个立体选择性全合成 β-d-甘露糖基磷酸酯。为了在链中引入立体中心,使用两种不同的不对称催化共轭添加方案制备了三个线性手性构件。使用 Julia-Kocienski 序列影响各种线性片段的偶联。这种方法构成了构建任何长度和立体化学的饱和低聚异戊二烯链的通用和收敛方法。此外,形成困难的 β-甘露糖基磷酸酯键的另一种方法已被证明是成功的。全 S 化合物的生物学评估表明,其对 T 细胞的抗原效力与天然产物相同。
An Iterative Catalytic Route to Enantiopure Deoxypropionate Subunits: Asymmetric Conjugate Addition of Grignard Reagents to α,β-Unsaturated Thioesters
作者:Renaud Des Mazery、Maddalena Pullez、Fernando López、Syuzanna R. Harutyunyan、Adriaan J. Minnaard、Ben L. Feringa
DOI:10.1021/ja053020f
日期:2005.7.1
A highly enantioselective (up to 96% ee) conjugate addition of Grignard reagents, in particular, MeMgBr, to alpha,beta-unsaturated thioesters is provided as well as its application to a diastereo- and enantioselective iterative route to syn- and anti-1,3-dimethyl arrays and deoxypropionate subunits. The versatility of the method is illustrated in the synthesis of (-)-lardolure, a multimethyl-branched