Enantioselective organocatalytic oxyamination of unprotected 3-substituted oxindoles
作者:Xavier Companyó、Guillem Valero、Oriol Pineda、Teresa Calvet、Mercè Font-Bardía、Albert Moyano、Ramon Rios
DOI:10.1039/c1ob06503c
日期:——
An enantioselective α-oxyamination of unprotected 3-substituted oxindoles with nitrosobenzene catalyzed by tertiary amine–thiourea bifunctional organocatalysts has been developed and affords the corresponding 3-amino-2-oxindole derivatives in good yields and with moderate to excellent enantioselectivities (up to > 99.9 : 0.1 er when the product is isolated by direct filtration from the reaction mixture)
未保护的3-取代的羟吲哚的对映体选择性α-氧化胺与 亚硝基苯已开发出由叔胺-硫脲催化的双功能有机催化剂,并以良好的收率和中等至极好的对映选择性提供了相应的3-氨基-2-氧吲哚衍生物(当通过直接过滤从中分离出产物时,最高可达> 99.9:0.1 er)。反应混合物)。产品的主要对映体的绝对构型已通过化学相关性以及理论计算值和实验ECD值之间的比较建立。