Controlling Stereoselectivity in the Aminocatalytic Enantioselective Mannich Reaction of Aldehydes with In Situ Generated N-Carbamoyl Imines
作者:Patrizia Galzerano、Dario Agostino、Giorgio Bencivenni、Letizia Sambri、Giuseppe Bartoli、Paolo Melchiorre
DOI:10.1002/chem.200903217
日期:2010.5.25
A simple and convenient method for the direct, aminocatalytic, and highly enantioselective Mannich reactions of aldehydes with in situ generated N‐carbamoyl imines has been developed. Both α‐imino esters and aromatic imines serve as suitable electrophilic components. Moreover, the judicious selection of commercially available secondary amine catalysts allows selective access to the desired stereoisomer
已开发出一种简便,简便的方法,用于醛与原位生成的N-氨基甲酰基亚胺的直接,氨基催化和高度对映选择性的曼尼希反应。α-亚氨基酯和芳族亚胺都可以用作合适的亲电子组分。此外,市售的仲胺催化剂的明智选择允许所述的所需的立体异构选择性接入ñ -叔丁氧羰基(BOC)或ñ在-苄酯基(Cbz)曼尼希加成物,具有很高的控制顺式或反相对构型和几乎完美的对映选择性。除了可以完全控制曼尼希反应的立体化学的可能性外,这种方法的主要优点还在于操作简便。高反应性的氨基甲酸酯保护的亚胺是由稳定且易于处理的α-酰胺基砜原位生成的。