Amines Bearing Tertiary Substituents by Tandem Enantioselective Carbolithiation–Rearrangement of Vinylureas
作者:Michael Tait、Morgan Donnard、Alberto Minassi、Julien Lefranc、Beatrice Bechi、Giorgio Carbone、Peter O’Brien、Jonathan Clayden
DOI:10.1021/ol3029324
日期:2013.1.4
organolithiums undergo rearrangement with migration of the N′-aryl ring from N to C, leading to the urea derivatives of enantiomerically enriched amines bearing tertiary substituents. Basic hydrolysis returns the functionalized amine, providing a new synthetic route to compounds with quaternary stereogenic centers bearing nitrogen.
在(-)-天冬氨酸或(+)-天冬氨酸替代物的存在下,有机锂加到N-烯基-N'-芳基脲上,以对映选择性的方式得到苄基有机锂。在DMPU的影响下,这些有机锂经历了N'-芳基环从N向C的迁移的重排,从而导致带有叔取代基的对映体富集的胺的脲衍生物。碱性水解会返回官能化的胺,从而为具有带氮季铵立体中心的化合物提供了一条新的合成途径。