Anchoring substitution in acyclic 1,3-amino alcohols. Asymmetric reductions with chiral modifications of lithium aluminum hydride and borane.
作者:Ivan Steels、Pierre J. De Clercq、J.P. Declercq
DOI:10.1016/s0957-4166(00)82290-9
日期:1992.5
Chiral modifications of LAH and amino alcohols1b and2 give erratic results in the asymmetric reduction of acetophenone. In the presence of chiral tetrahydro-1,3,2-oxazaborines, derived from1a, however, the borane reduction of acetophenone consistently leads to the (R)-carbinol in excess. The absolute configuration of the chiral ligands is determined via X-ray analysis of the ammonium (S)-(+)-10-camphorsulfonate
LAH和氨基醇1b和2的手性修饰导致苯乙酮不对称还原的不稳定结果。但是,在存在衍生自1a的手性四氢-1,3,2-恶唑硼酮的情况下,苯乙酮的硼烷还原反应始终导致过量的(R)-甲醇。手性配体的绝对构型是通过X射线分析衍生自2的(S)-(+)-10-樟脑磺酸铵盐8来确定的。