The synthesis of chiral amino diol tridentate ligands and their enantioselective induction during the addition of diethylzinc to aldehydes
作者:An-lin Zhang、Li-wen Yang、Nian-fa Yang、Yan-ling Liu
DOI:10.1016/j.tetasy.2013.11.007
日期:2014.2
A series of C2-symmetric chiral amino diol tridentate ligands 3a–g were prepared from achiral bulky organolithiums, achiral bulky primary amines, and optically active epichlorohydrin (ECH). The prepared C2-symmetric chiral amino diol tridentate ligands were capable of inducing enantioselectivity in the model reaction of aromatic and aliphatic aldehydes with diethylzinc with an ee of up to 96%. The
由非手性庞大的有机锂,非手性庞大的伯胺和旋光表氯醇(ECH)制备了一系列C 2对称的手性氨基二醇三齿氨基配体3a – g。准备好的C 2芳族和脂族醛与二乙基锌的模型反应中,对称对称的手性氨基二醇三齿配体能够诱导对映选择性,ee最高可达96%。可以通过调节在手性配体的合成中使用的非手性试剂的空间位阻来调节对映选择性。加成产物的构型取决于氨基二醇配体的构型,可以通过在配体的制备过程中使用具有所需构型的ECH来根据需要简单地控制。