Substituted Diarylmethylamines by Stereospecific Intramolecular Electrophilic Arylation of Lithiated Ureas
作者:Jonathan Clayden、Jérémy Dufour、Damian M. Grainger、Madeleine Helliwell
DOI:10.1021/ja071523a
日期:2007.6.1
On lithiation, N-benzyl ureas varying N‘-aryl substituents undergo a migration of the aryl ring to the α carbon of the N-benzyl group. With chiral, enantiomerically pure N-α-methylbenzyl ureas, the rearrangement is stereospecific and creates a new, fully substituted stereogenic center α to N. Removal of the urea function by N-nitrosation and hydrolysis allows the synthesis of chiral tertiary carbinamines
在锂化时,N-苄基脲随着 N'-芳基取代基发生变化,芳环迁移到 N-苄基的 α 碳上。使用手性、对映体纯的 N-α-甲基苄基脲,重排是立体定向的,并产生一个新的、完全取代的立体中心 α 到 N。通过 N-亚硝化和水解去除脲功能允许在高对映体中合成手性叔卡宾胺纯度。