Highly Enantioselective Diethylzinc Addition to Imines Employing Readily Available <i>N</i>-Monosubstituted Amino Alcohols
作者:Hai-Le Zhang、Xiao-Mei Zhang、Liu-Zhu Gong、Ai-Qiao Mi、Xin Cui、Yao-Zhong Jiang、Michael C. K. Choi、Albert S. C. Chan
DOI:10.1021/ol025728u
日期:2002.4.1
easily accessible chiral ligand 3c, which promoted diethylzinc addition to imines with 96-98% ee, has been found by finely screening N,N-disubstituted and N-monosubstituted amino alcohols. N-monosubstituted amino alcohols, on average, gave slightly higher enantioselectivities than their N,N-disubstituted analogues. These results imply that the restricted and rigid structure of amino alcohol is not the absolute
通过精细筛选N,N-二取代和N-单取代的氨基醇,发现了一种容易获得的手性配体3c,它促进了二乙基锌添加到具有96-98%ee的亚胺中。平均而言,N-单取代的氨基醇比其N,N-二取代的类似物具有更高的对映选择性。这些结果表明,氨基醇的受限和刚性结构不是对二苯基膦基嘧啶的高对映选择性二烷基锌的绝对要求。[结构:见文字]