A dual catalytic system has been developed following the screening of a series of chiral primary amine catalysts and chiral phosphoric acid catalysts for the Michael addition of cyclic ketones to nitroolefins bearing only one α‐substituent. The resulting γ‐nitro ketones, which contain a substituent on the carbon connected to the nitro group, were formed in excellent yields (>80%) with high levels of
在筛选了一系列手性
伯胺催化剂和手性
磷酸催化剂后,开发了一种双催化体系,用于将环酮迈克尔加成到仅带有一个α取代基的硝基烯烃上。生成的γ-硝基酮在反应时以极好的收率(> 80%)和高
水平的立体选择性(高达94:6 dr和98%ee)形成,其在与硝基相连的碳上包含一个取代基。在0°C的苯中,以10 mol%的最佳胺/
磷酸组合(1:1)作为催化剂进行反应。随后还原硝基,然后进行分子内还原胺化可提供旋光性顺式在其2位带有一个非功能性取代基的八氢
吲哚类似物。