Stereoselective 1,4-addition of Grignard reagents to chiral γ-alkoxy-α,β-unsaturated ketones
作者:Jerzy Raczko
DOI:10.1016/s0957-4166(97)00520-x
日期:1997.11
Copper-catalyzed conjugate addition reactions of Grignard reagents to γ-alkoxy-α,β-unsaturated ketones, derived from mandelic acid, have been studied. Diastereoselectivity is strongly dependent on the nature of the γ-alkoxy protection group. Bulky silyl protection gives poor stereoselectivities, whereas the ketone bearing benzyloxymethylene (BOM) protection reacts with excellent yields and stereoselectivities
研究了格氏试剂对扁桃酸衍生的γ-烷氧基-α,β-不饱和酮的铜催化共轭加成反应。非对映选择性在很大程度上取决于γ-烷氧基保护基团的性质。庞大的甲硅烷基保护基团的立体选择性差,而带有苄氧基亚甲基(BOM)的酮类化合物的反应则具有优异的收率和立体选择性。