A practical synthesis of optically active arylglycines via catalytic asymmetric Strecker reaction
作者:Vorawit Banphavichit、Woraluk Mansawat、Worawan Bhanthumnavin、Tirayut Vilaivan
DOI:10.1016/j.tet.2009.04.098
日期:2009.7
A practical procedure for catalytic asymmetric synthesis of optically active arylglycine derivatives via optically active α-aminonitriles has been developed. The N-benzhydryl α-arylaminonitrile intermediates were prepared in excellent yield (89–99%) and enantiomeric purity (96 to >98% ee) by enantioselective cyanation of aldimines with TMSCN/iPrOH in the presence of 2.5 mol % of an easily prepared
已经开发了通过光学活性α-氨基腈催化不对称合成光学活性芳基甘氨酸衍生物的实用方法。所述Ñ在良好的产率(89-99%)和对映体纯度(96至> 98%ee)的通过与TMSCN /醛亚胺对映选择性氰化制备-二苯甲基α-arylaminonitrile中间体我PrOH中在2.5%(摩尔)的存在下很容易地在0°C下制备Ti /手性氨基醇络合物,而无需缓慢添加氰化剂。易消旋的α-氨基腈中间体被HCl / TFA水溶液有效水解,得到芳基甘氨酸衍生物,收率高(60-92%),对映体纯度中等至极好(ee 85-98%)。