作者:Ismail Ibrahem、Weibiao Zou、Jesús Casas、Henrik Sundén、Armando Córdova
DOI:10.1016/j.tet.2005.08.113
日期:2006.1
The scope and limitations of the direct organocatalytic asymmetric α-aminomethylation of ketones are disclosed. The proline-catalyzed classical Mannich reactions between unmodified ketones, aqueous formaldehyde and aromatic amines furnished the desired Mannich bases in high yield with up to >99% ee. Moreover, methyl alkyl ketones were regioselectively α-aminomethylated at the methylene carbon affording
公开了酮的直接有机催化不对称α-氨基甲基化的范围和限制。未经修饰的酮,甲醛水溶液和芳族胺之间脯氨酸催化的经典曼尼希反应以高收率提供了所需的曼尼希碱,ee高达99%以上。此外,甲基烷基酮在亚甲基碳上被区域选择性地α-氨基甲基化,从而提供了具有高达> 99%ee的相应曼尼希产品。此外,脯氨酸催化的对苯甲醚,甲醛水溶液和4,4-二甲基-2-环二烯-1-酮之间的一锅三组分反应为相应的双环氮杂-Diels-Alder加合物提供了> 99%ee 。