Enantioselective Synthesis of γ-Lactams by Lewis Base Catalyzed Sulfenoamidation of Alkenes
作者:Jesse L. Panger、Scott E. Denmark
DOI:10.1021/acs.orglett.9b04347
日期:2020.4.3
A method for the catalytic, enantioselective, intramolecular 1,2-sulfenoamidation of alkenes is described. Lewis base activation of a suitable sulfur electrophile generates an enantioenriched, thiiranium ion intermediate from a β,γ-unsaturated sulfonyl carboxamide. This intermediate is subsequently intercepted by the sulfonamide nitrogen resulting in cyclization to form γ-lactams. Electron-poor alkenes
描述了用于烯烃的催化,对映选择性,分子内1,2-亚磺酰胺化的方法。合适的硫亲电试剂的路易斯碱活化作用是从β,γ-不饱和磺酰基羧酰胺中生成对映体富集的噻吩鎓离子中间体。该中间体随后被磺酰胺氮拦截,导致环化形成γ-内酰胺。贫电子烯烃需要使用新型硒代氨基磷酸酯路易斯碱催化剂。产物的后续处理利用了酰胺和硫醚官能团的潜在反应性。