Copper-Catalysed Conjugate Addition of Grignard Reagents to 2-Methylcyclopentenone and Sequential Enolate Alkylation
作者:Beatriz C. Calvo、Ashoka V. R. Madduri、Syuzanna R. Harutyunyan、Adriaan J. Minnaard
DOI:10.1002/adsc.201400085
日期:2014.6.16
The copper/Rev‐JosiPhos‐catalysed asymmetric conjugate addition of Grignard reagents to 2‐methylcyclopentenone (1) provides 2,3‐disubstituted cyclopentanones in high yields and enantioselectivities, and good diastereoselectivities. Reaction of the in situ formed enolate with various alkylating reagents in the presence of 1,3‐dimethyltetrahydropyrimidine‐2(1H)‐one (DMPU) affords the corresponding products
铜/ Rev-JosiPhos催化的格氏试剂到2-甲基环戊烯酮(1)的不对称共轭加成反应可高产率,对映选择性和良好的非对映选择性提供2,3-二取代的环戊酮。所述的反应在原位在1,3- dimethyltetrahydropyrimidine-2的存在下与各种烷基化试剂形成烯醇化物(1 ħ) -酮(DMPU),得到相应的产品中的一锅反应。此过程将创建两个邻近的立体中心,其中之一是四元的。