作者:Alok K. Awasthi、Mark L. Boys、Kimberly J. Cain-Janicki、Pierre-Jean Colson、Wendel W. Doubleday、Joseph E. Duran、Payman N. Farid
DOI:10.1021/jo050177h
日期:2005.7.1
A practical, large-scale synthesis of a β-amino ester 1 was developed. A chiral imine derived from (S)-phenylglycinol and 3-trimethylsilylpropanal was coupled with the Reformatsky reagent 3 with high diastereoselectivity (de > 98%) to give (SS)-4a as the major isomer. The amino alcohol residue of the coupling product 4 was oxidatively cleaved with sodium periodate in the presence of methylamine. An
开发了实用,大规模的β-氨基酯1的合成方法。将衍生自(S)-苯基甘醇和3-三甲基甲硅烷基丙醛的手性亚胺与具有高非对映选择性(de> 98%)的Reformatsky试剂3偶联,得到(SS)-4a作为主要异构体。在甲胺存在下,用高碘酸钠氧化裂解偶联产物4的氨基醇残基。观察到(SS)-异构体的不寻常的选择性氧化裂解,并且获得了ee> 99%的亚胺6,而没有裂解(RS)-4b异构体。与p-反应甲苯磺酸一水合物可以水解亚胺,并分离出胺盐。然后通过一锅法通过酯交换,甲硅烷基化和形成盐酸盐获得标题化合物1。该方法已成功应用于多种β-氨基酯的合成。