Enantioselective Copper-Catalyzed Conjugate Addition of Trimethylaluminum to β,γ-Unsaturated α-Ketoamides: Efficient Access to γ-Methyl-Substituted Carbonyl Compounds
作者:Sylvie Goncalves-Contal、Ludovic Gremaud、Alexandre Alexakis
DOI:10.1002/anie.201306541
日期:2013.11.25
4‐adducts were obtained with perfect 1,4‐regioselectivity and good to excellent yields and ee values. The potential synthetic utility of the methodology was highlighted by preparation of γ‐methyl‐substituted carbonyls, key synthons to many natural products. binap=2,2′‐bis(diphenylphosphino)‐1,1′‐binaphthyl, TC=thiophene carboxylate.
完美图片:通过使用三甲基铝试剂和β,γ-不饱和α-酮酰胺,可获得1,4-加合物,具有完美的1,4-区域选择性,并具有极佳的收率和ee 值。通过制备γ-甲基取代的羰基化合物(许多天然产物的关键合成子),突出了该方法的潜在合成效用。binap = 2,2'-双(二苯基膦基)-1,1'-联萘基,TC =噻吩羧酸盐。