作者:Dieter Enders、Dirk Iffland、Gerhard Raabe
DOI:10.1055/s-0029-1216643
日期:2009.5
An efficient asymmetric synthesis of anti-1,2-disubstituted taurine derivatives through nucleophilic addition of phenylmethanesulfonate to various N-acylimines in the presence of 1,2:5,6-di-O-isopropylidene-α-d-allofuranose as a chiral auxiliary is described. The taurine derivatives were obtained in three steps with good overall yields (36-61%) and excellent enantiomeric excesses (83-98%). The diastereomeric
在1,2:5,6-二-O-异亚丙基-α - d-呋喃糖为手性存在下,通过将苯甲磺酸盐亲核加成到各种N-酰基亚胺中,有效地不对称合成抗-1,2-二取代的牛磺酸衍生物描述辅助。通过三个步骤获得了牛磺酸衍生物,其总收率良好(36-61%),对映体过量极佳(83-98%)。通过柱色谱法或重结晶可以将非对映体过量的15-91%提高到90-98%。通过X射线晶体结构分析确定产物的相对和绝对构型。 牛磺酸-不对称合成-糖助剂-N-嘧啶-α-酰胺基砜-手性助剂