to the active pharmaceutical ingredient AMG 232. Central to this work was the identification of the ruthenabicyclic complex RuCl[(S)-daipena][(S)-xylBINAP] ((S)-RUCY-xylBINAP), which afforded the product with >98:2 enantiomeric ratio at a substrate to catalyst loading (S/C) of 2000:1. By transesterification to a more sterically hindered isopropyl ester prior to the hydrogenation, we were able to curb
我们在本文中描述了可扩展的Noyori还原动态动力学分辨率的发展,以制造D
LAC,这是活性药物成分
AMG 232的Δ-内酯前体。这项工作的中心是鉴定
钌双环复合物RuCl [(S)-daipena] [ (S)-xylBINAP]((S)-RUCY-xylBINAP),其在底物与催化剂的负载量(S / C)为2000:1时提供具有> 98:2对映体比率的产物。通过在氢化之前进行酯交换反应生成位阻更大的异
丙酯,我们能够抑制酯的意外还原。在最终烷基化步骤中形成D
LAC的碱当量的优化防止产品降解。经过优化的工艺可扩展到> 200 kg,从而以5%的总收率提供147 kg D
LAC,光学纯度为99.9%。