Readily available chiral phosphine–aminophosphine ligands derived from 1-phenylethylamine for Rh-catalyzed enantioselective hydrogenations
作者:Xiao-Mao Zhou、Jia-Di Huang、Li-Bin Luo、Cheng-Lu Zhang、Zhuo Zheng、Xiang-Ping Hu
DOI:10.1016/j.tetasy.2010.03.008
日期:2010.3
hydrogenation of various enamides, β-dehydroamino acid esters, and dimethyl itaconate. The results show that the ligand structure plays an important influence on both the reactivity and enantioselectivity. Ligand 2d bearing a N–H proton and two F-atoms on the 3,5-positions of the phenyl ring of the aminophosphino moiety was most effective for the hydrogenation of enamides and (Z)-β-aryl-β-(acylamino)acrylates
通过两步或三步转化,从市售廉价的(S)-1-苯基乙胺中制备了一系列新的手性膦-氨基膦配体,并成功用于铑催化的各种酰胺的不对称加氢,β-脱氢氨基酸酯和衣康酸二甲酯。结果表明,配体结构对反应性和对映选择性均起重要作用。配体2d在氨基膦基部分的苯环的3,5-位带有一个N– H质子和两个F原子,对酰胺和(Z)-β-芳基-β-(酰氨基)的氢化最有效丙烯酸酯,而配体1b在(Z)-β-烷基-β-(酰基氨基)丙烯酸酯和衣康酸二甲酯的氢化中显示最高的对映选择性。