Nickel acetylacetonate is an efficient catalyst for the 1,4-addition of trimethylaluminum to α,β-unsaturated ketones. The reaction is strongly solvent dependent and gives best results in tetrahydrofuran or ethyl acetate. The reaction is especially useful for the nucleophilic 1,4-methyl transfer to sterically hindered enones. A β-cuparenone synthesis via conjugate methyl group addition to an enone precursor is described.
醋酸镍是一种高效的
催化剂,能够促进
三甲基铝对α,β-不饱和
酮的1,4-加成。该反应对溶剂有很强的依赖性,在
四氢呋喃或
乙酸乙酯中能取得最佳效果。该反应尤其适用于对空间位阻较大的
酮进行亲核性的1,4-
甲基转移。文中描述了一种通过对
酮前体进行共轭
甲基团加成合成β-
氟喹啉的方法。