Solid-Phase Synthesis of Chiral <i>N</i>-Acylethylenediamines and Their Use as Ligands for the Asymmetric Addition of Alkylzinc and Alkenylzinc Reagents to Aldehydes
作者:Christopher M. Sprout、Meaghan L. Richmond、Christopher T. Seto
DOI:10.1021/jo049160+
日期:2004.10.1
synthesis of chiral N-acylethylenediamine ligands. The ligands are obtained in good yield and purity, without the need for chromatography or other purification methods. Several new and previously reported ligands were prepared using this procedure. These compounds were examined as catalysts for the enantioselective addition of alkylzinc reagents to aldehydes. In all cases, the crude ligands from the solid-phase
已经开发了用于合成手性N-酰基乙二胺配体的固相方法。以良好的产率和纯度获得配体,而不需要色谱法或其他纯化方法。使用该程序制备了几种新的和先前报道的配体。检查了这些化合物作为将烷基锌试剂对映异构体加成到醛中的催化剂。在所有情况下,与使用已通过标准方法纯化的配体进行的反应相比,固相合成的粗配体以相似的收率和立体选择性催化反应。还对配体3a和3f进行了初步研究用作将烯基锌试剂加到醛中以得到手性烯丙基醇的催化剂。发现配体3f以高达76%的ee催化该加成反应。