作者:Michael R. Hollerbach、Jacob C. Hayes、Timothy J. Barker
DOI:10.1002/ejoc.201801804
日期:2019.2.21
Benzylation reactions of N-tosyl imines and N-tert-butanesulfinyl imines using benzylboronic acid pinacol ester are reported. s-Butyllithium was used to activate the boronic ester, rendering it nucleophilic. The reaction was compatible with electronically diverse substituents on the imine in both substrate classes. Good diastereoselectivity was observed in additions to N-tert-butylsulfinylaldimines
报道了使用苄基硼酸频哪醇酯的 N-甲苯磺酰基亚胺和 N-叔丁烷亚磺酰基亚胺的苄基化反应。仲丁基锂用于活化硼酸酯,使其具有亲核性。该反应与两种底物类别中亚胺上的电子不同取代基相容。除了 N-叔丁基亚磺酰基醛亚胺之外,还观察到了良好的非对映选择性。在这些反应中观察到的非对映选择性与加成的开放过渡态一致。还包括仲烷基硼酸酯亲核试剂和N-叔丁烷亚磺酰基三氟甲基酮亚胺亲电试剂的实例。