Asymmetric synthesis of chiral Roche ester and its derivatives via Rh-catalyzed enantioselective hydrogenation with chiral phosphine-phosphoramidite ligands
作者:Min Qiu、Dao-Yong Wang、Xiang-Ping Hu、Jia-Di Huang、Sai-Bo Yu、Jun Deng、Zheng-Chao Duan、Zhuo Zheng
DOI:10.1016/j.tetasy.2008.12.026
日期:2009.2
, known as the Roche ester, was prepared with high enantioselectivity (up to 96.7% ee) via the Rh-catalyzed asymmetric hydrogenation of methyl 2-hydroxymethylacrylate with a chiral 1,2,3,4-tetrahydro-1-naphthylamine-derived phosphine-phosphoramidite ligand (THNAPhos 5a) even at a low catalyst loading (0.1 mol %). An investigation on the substrate scope revealed that the ester group present in the substrate
3-羟基-2-甲基丙酸甲酯(称为罗氏酯)是通过Rh催化2-羟基甲基丙烯酸甲酯与手性1,2,3,4-甲基丙烯酸的不对称加氢反应而制得的,具有高对映选择性(至96.7%ee)。即使在低催化剂负载量(0.1mol%)下,四氢-1-萘胺衍生的膦-亚磷酰胺配体(THNAPhos 5a)。对底物范围的研究表明,底物中存在的酯基对对映选择性有显着影响,而具有较大酯基的底物倾向于给出较低的对映选择性。