The first catalytic asymmetric synthesis of both (R)-(+)- and (S)-(-)-4-methyl-2-cyclohexen-1-one and a new and improved synthesis of both enantiomers of (1S,4S)-(-) and (1R,4R)-(+)-4-methyl-2-cyclohexen-1-ol was developed on a multigram scale. The key step of this approach is the asymmetric catalyzed addition of Me2Zn (SN2'-pathway) to racemic 1,3-cyclohexadiene monoepoxide. This step has been optimized
(R)-(+)- 和 (S)-(-)-4-methyl-2-cyclohexen-1-one 的首次催化不对称合成以及 (1S,4S) 的两种对映体的新的和改进的合成-(-) 和 (1R,4R)-(+)-4-methyl-2-cyclohexen-1-ol 以多克规模开发。该方法的关键步骤是将 Me2Zn(SN2'-途径)不对称催化加成到外消旋的
1,3-环己二烯单
环氧化物中。该步骤已针对对映选择性和区域选择性以及后处理程序进行了优化。本文报道的 2,2'-联
萘基亚
磷酰胺的手性
铜络合物所表现出的引人注目的
配体加速催化作用允许非常低的催化剂负载量 (0.6 mol%)。