effective in dry DMF. The above-mentioned lithium acetate-catalyzed Mannich-type reaction between aldimines and various trimethylsilyl (TMS) enolethers such as silyl ketene acetal proceeded smoothly even in water-containing DMF. Then, Lewis base catalyzed three-component Mannich-type reactions of TMS enolether, tosylamide, and aromatic aldehyde having electron-withdrawing group such as p-nitrobenzaldehyde
Potassium or ammonium carboxylates catalyzed Mannich-type reaction between trimethylsilyl enolates and aldimines proceeded smoothly to afford the corresponding β-amino carbonyl compounds in good to high yields with high anti selectivity.
Chiral Copper Complexes of Phosphino Sulfenyl Ferrocenes as Efficient Catalysts for Enantioselective Formal Aza Diels−Alder Reactions of <i>N</i>-Sulfonyl Imines
作者:Olga García Mancheño、Ramón Gómez Arrayás、Juan C. Carretero
DOI:10.1021/ja038494y
日期:2004.1.1
catalytic amount of silver perchlorate, copper(I) bromide complexes of planar chiral 1-phosphino-2-sulfenylferrocenes behave as very efficient chiral Lewis acids catalysts in the formal Aza Diels-Alder reaction of N-arylsulfonyl aldimines with electron-rich dienes (Danishefsky's and related dienes). Mixing of equimolar amounts of the readily available enantiopure ferrocenyl P,S-bidentate ligand and CuBr quantitatively
Lithium benzamide- or potassium phthalimide-catalyzed Mannich-type reactionbetweentrimethylsilylenolates and aldimines proceeded smoothly in a DMF solvent to afford the corresponding β-amino esters in good to high yields.
Lewis base-catalyzed Strecker-type reaction between trimethylsilyl cyanide and N-tosylimines proceeded smoothly in dry DMF or water-containing DMF and the corresponding α-amino compounds were obtained in good to high yields.