Base-catalyzed three-component direct Mannich reaction of enolizable ketones with high syn-selectivities
作者:Qunsheng Guo、John Cong-Gui Zhao、Hadi Arman
DOI:10.1016/j.tetlet.2012.06.140
日期:2012.9
The three-component direct Mannich reaction between aldehydes, p-toluenesulfonamide, and enolizable ketones was achieved for the first time with organic bases as the catalysts. The corresponding N-tosylated β-aminoketones were obtained in high yields and good to excellent diastereoselectivities using TMG as the catalyst. Through reduction of the ketone group, the reaction product may be converted into
醛,对甲苯磺酰胺和可烯醇化的酮之间的三组分直接曼尼希反应是首次使用有机碱作为催化剂实现的。使用TMG作为催化剂,以高收率和良好至优异的非对映选择性获得了相应的N-甲苯磺酸化的β-氨基酮。通过还原酮基,可以将反应产物以优异的非对映选择性转化为β-氨基。