A chiral bidentate phosphoramidite (Me-BIPAM) for Rh-catalyzed asymmetric hydrogenation of α-dehydroamino esters, enamides, and dimethyl itaconate
作者:Kazunori Kurihara、Yasunori Yamamoto、Norio Miyaura
DOI:10.1016/j.tetlet.2008.12.086
日期:2009.7
High performance of Me-BIPAM for enantioselective hydrogenation of α-dehydroamino esters, enamides, and dimethyl itaconate was demonstrated. [Rh(Me-BIPAM)(diene)]X (diene = cod, nbd; X = BF4, PF6, SbF6) gave optically active β-aryl α-amino esters up to 99% ee, 1-arylethylamines up to 97% ee, methyl 2-acetylaminobutanoate with 90% ee, and dimethyl 2-methylsuccinate with 97% ee under 0.3−0.8 MPa dihydrogen
证明了Me-BIPAM对α-脱氢氨基酯,酰胺和衣康酸二甲酯的对映选择性氢化的高性能。[Rh(Me-BIPAM)(二烯)] X(二烯= cod,nbd; X = BF 4,PF 6,SbF 6)得到的旋光性β-芳基α-氨基酯含量高达ee的99%,1-芳基乙基胺含量高达在0.3-0.8 MPa的二氢和0.1-1 mol%的催化剂载量下,达到97%ee,具有90%ee的2-乙酰氨基丁酸甲酯和具有97%ee的2-甲基琥珀酸二甲酯。