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 Mannichreaction 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
Highly Enantioselective Three-Component Direct Mannich Reactions of Unfunctionalized Ketones Catalyzed by Bifunctional Organocatalysts
作者:Qunsheng Guo、John Cong-Gui Zhao
DOI:10.1021/ol303315c
日期:2013.2.1
stereoselective three-component direct Mannich reaction between aromatic aldehydes, p-toluenesulfonamide, and unfunctionalized ketones was achieved through an enolate mechanism for the first time with a bifunctional quinidine thiourea catalyst. The corresponding N-tosylated β-aminoketones were obtained in high yields and excellent diastereo- and enantioselectivities (up to >99:1 dr and >99% ee).
芳香醛、对甲苯磺酰胺和未官能化酮之间的高度立体选择性三组分直接曼尼希反应首次通过烯醇机制与双官能奎尼丁硫脲催化剂实现。以高产率和出色的非对映选择性和对映选择性(高达 >99:1 dr 和 >99% ee)获得了相应的N-甲苯磺酰化 β-氨基酮。