作者:Robert Glaser、Shimona Geresh
DOI:10.1016/s0040-4020(01)93754-8
日期:1979.1
derivatives. In the series of N-acylphenylalanine free acids (resulting from hydrogenation of Z-α-acylaminocinnamic acids) the optical purity decreased from 82% ee-(R) [Me]; 57% ee-(R) [i-Pr]; 52% ee-(R) [t-Bu]; to 46% ee-(R) [1-adamantyl]. Theα-benzamido, α-formamido and α-trifluoroacetamido substrates gave hydrogenation products having 68% ee-(R) [Ph]; 60% ee-(R) [H]; and 16% ee-(R)[CF3]. In the
Z-α-酰基氨基肉桂酸和酯用含(4R,5R)-反式-4,5-双(二苯基膦基甲基)-2,2-二甲基-1,3-二氧戊环(DIOP)的铑(I)配合物氢化。增加酰基官能团的空间体积(NHCOR,其中R是烷基部分)导致si-re手性表面的减少降低,从而产生减少的过量(R)-氨基酸衍生物。在一系列N-酰基苯基丙氨酸游离酸(由于Z-α-酰基氨基肉桂酸的氢化作用)中,光学纯度从82%ee-(Me)降低。57%ee-(R)[i-Pr];52%ee-(R)[t-Bu];达到46%ee-(1-金刚烷基)。α-苯甲酰胺基,α-甲酰胺基和α-三氟乙酰胺基底物得到具有68%ee-(Ph)的加氢产物。60%ee-(R)[H]; 和16%ee-(R)[CF 3]。在相应的甲酯中,增加酰基官能团(NHCOR)的空间体积会导致对映体分化明显降低。在一系列N-酰基苯基丙氨酸甲酯产物(由于Z-甲基α-酰基氨基肉桂酸酯的氢化作用)