Asymmetric Nitroaldol Reactions of Nitroalkanes with Isatins Catalyzed by Bifunctional Cinchona Alkaloid Derivatives
作者:Mei-Qiu Li、Jin-Xin Zhang、Xiao-Fei Huang、Bin Wu、Zhao-Min Liu、Jian Chen、Xiang-Dong Li、Xing-Wang Wang
DOI:10.1002/ejoc.201100824
日期:2011.9
The enantioselective nitroaldol reactions of isatins with nitroalkanes were smoothly carried out by organocatalysis. A C6′-OH cinchona alkaloid derivative bearing a C9-OBn group exhibited outstanding catalytic efficiency as an acid–base bifunctional catalyst for the nitroaldol reaction of isatins with nitromethane, providing 3-hydroxy-3-(nitromethyl)indolin-2-ones in good yields (90–98 %) and with
靛红与硝基烷烃的对映选择性硝基醛醇反应通过有机催化顺利进行。带有 C9-OBn 基团的 C6'-OH 金鸡纳生物碱衍生物作为酸碱双功能催化剂表现出优异的催化效率,用于靛红与硝基甲烷的硝基醛醇反应,提供 3-羟基-3-(硝基甲基)吲哚-2-酮良好的产率 (90–98%) 和良好到高的对映体过量值 (72–95%)。所得羟吲哚衍生物对于合成相关天然产物和药物活性化合物非常重要。