Lewis Base Catalyzed Mannich-Type Reactions between Trimethylsilyl Enol Ethers and Aldimines
作者:Hidehiko Fujisawa、Eiki Takahashi、Teruaki Mukaiyama
DOI:10.1002/chem.200500821
日期:2006.6.23
effective in dry DMF. The above-mentioned lithium acetate-catalyzed Mannich-type reaction between aldimines and various trimethylsilyl (TMS) enol ethers such as silyl ketene acetal proceeded smoothly even in water-containing DMF. Then, Lewis base catalyzed three-component Mannich-type reactions of TMS enol ether, tosylamide, and aromatic aldehyde having electron-withdrawing group such as p-nitrobenzaldehyde
描述了三甲基甲硅烷基烯醇醚和N-甲苯磺酰基亚胺之间的路易斯碱催化的曼尼希型反应。发现在室温下,由酰胺或酰亚胺(如苯甲酰胺锂或邻苯二甲酰亚胺钾)生成的氮阴离子是有效的路易斯碱催化剂,可在DMF中以高收率或高收率提供相应的β-氨基羰基化合物。还发现由羧酸(如乙酸锂)生成的氧阴离子在干燥DMF中有效。即使在含水DMF中,醛亚胺与各种三甲基甲硅烷基(TMS)烯醇醚如甲硅烷基乙烯酮缩醛之间的上述乙酸锂催化的曼尼希型反应也能顺利进行。然后,路易斯碱催化TMS烯醇醚,甲苯磺酰胺,研究了具有吸电子基团的芳醛,例如对硝基苯甲醛。反应平稳进行,以高收率得到相应的β-氨基酯。此外,发现羧酸铵例如乙酸四丁铵或苯甲酸四丁铵是在上述曼尼希型反应中更有效的路易斯碱催化剂。在较低的温度下,在各种溶剂中进行合成。由硫酯和各种酮(如苯乙酮或环己酮)生成的Aldimines与TMS烯醇醚之间的反应也顺利进行,以高收率提供了具有