申请人:CHIRAL QUEST (SUZHOU) CO., LTD.
公开号:US10183909B2
公开(公告)日:2019-01-22
A process is provided for preparation of (R)-N-Boc biphenyl alaninol. It provides a preparation process for a compound outlined as compound 4, which includes these operations: in one of the alcohol solvents, asymmetric hydrogenation of 5 in the presence of [Rh(Duanphos)(X)]Y and hydrogen to provide compound 4. Here “Duanphos” is (Rc,Sp)-Duanphos or (Sc,Rp)-Duanphos; X is NBD or/and COD; Y is one or more of BF4, PF6, SbF6. This process has a lot of advantages, such as low cost, safe operation, less pollution and high yield. The product was obtained in >99% purity and ee which is suitable to scale up in industrial scale.
本发明提供了一种制备(R)-N-叔丁氧羰基联苯丙氨醇的工艺。本发明提供了一种化合物 4 的制备工艺,包括以下操作:在醇溶剂之一中,在[Rh(Duanphos)(X)]Y 和氢的存在下,不对称氢化 5,得到化合物 4。这里的 "Duanphos "是指 (Rc,Sp)-Duanphos 或 (Sc,Rp)-Duanphos;X 是指 NBD 或/和 COD;Y 是指 BF4、PF6、SbF6 中的一种或多种。该工艺具有成本低、操作安全、污染少、收率高等优点。产品的纯度和ee均大于 99%,适合工业化生产。