Regioselective α-alkylation of ketones with alkyl chlorides and fluorides via highly nucleophilic magnesium enamides
作者:Takuji Hatakeyama、Shingo Ito、Hiroaki Yamane、Masaharu Nakamura、Eiichi Nakamura
DOI:10.1016/j.tet.2007.05.087
日期:2007.8
A magnesium enamide derived from N-2-(N′,N′-dimethylamino)ethyl imine reacts with primary and secondary alkyl chlorides and fluorides to give an α-alkylated ketone in good to excellent yields upon hydrolysis of the imine moiety. Reactions of the highly nucleophilic magnesium enamide derived from an unsymmetrical ketone take place regioselectively. In addition, the C–C bond formation is stereospecific:
衍生自N -2-(N ',N'-二甲基氨基)乙基亚胺的镁酰胺与伯和仲烷基氯化物和氟化物反应,生成亚烷基化的酮,亚胺部分水解后,收率高至优异。衍生自不对称酮的高度亲核性镁烯酰胺的反应是区域选择性地发生的。另外,CC键的形成是立体定向的:亲电碳中心的立体化学发生了实质性的反转(Walden反转),证明了其在生产旋光化合物方面的潜在用途。