作者:Enzo Mai、Christoph Schneider
DOI:10.1002/chem.200601307
日期:2007.3.16
The scandium-bipyridine-catalyzed enantioselective addition of anilines and O-alkyl hydroxylamines to meso-epoxides has been optimized and extended to a broad range of epoxides and amines. Whereas aromatic meso-epoxides generally furnished the corresponding 1,2-amino alcohols in excellent enantioselectivities, aliphatic meso-epoxides only gave rise to moderate enantioselectivities in the aminolysis
optimized联吡啶催化苯胺和O-烷基羟胺对映体环氧化物的对映选择性加成已得到优化,并扩展到广泛的环氧化物和胺中。芳族内消旋环氧化物通常以优异的对映选择性提供相应的1,2-氨基醇,而脂族内消旋环氧化物仅在氨解反应中产生中等对映选择性。催化剂的加入量可以降低到仅5mol%,而对收率和对映选择性只有很小的影响。已经观察到强烈的正非线性效应,指出了催化剂的聚集现象。