Nickel-Catalysed Conjugate Addition of Trimethylaluminum to Sterically Hindered α,β-Unsaturated Ketones
作者:Steffen Flemming、Jazid Kabbara、Klaus Nickisch、Harribert Neh、Jürgen Westermann
DOI:10.1055/s-1995-3901
日期:1995.3
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。