First enantioselective synthesis of (−)-talaumidin, a neurotrophic diaryltetrahydrofuran-type lignan
作者:Tomoyuki Esumi、Daisuke Hojyo、Haifeng Zhai、Yoshiyasu Fukuyama
DOI:10.1016/j.tetlet.2006.04.006
日期:2006.6
first enantioselective total synthesis of a neurotrophic (−)-talaumidin (1) is described in 16 steps from 4-benzyloxy-3-methoxybenzaldehyde in ca. 10.7% overall yield, and thus has established the absolute configurations of the four stereogenic centers C-2 ∼ C-5 of 1. The synthesis features the construction of the two successive chiral centers C-2 and C-3 by Evans asymmetric anti-aldol protocol as
神经营养性(-)-talaumidin(1)的第一个对映选择性全合成是在16步中从4-苄氧基-3-甲氧基苯甲醛在约16步中描述的。10.7%的总收率,并且因此已建立的四个手性中心C-2〜C-5的的绝对构型1。合成的特征是通过Evans不对称反醛醇缩合方法构建两个连续的手性中心C-2和C-3,以及通过硼氢化/氧化和高立体控制方式构建两个手性中心C-4和C-5。差向异构化,然后进行Friedel-Crafts芳基化。