A catalyst-driven one-pot reaction sequence is developed for the enantio- and diastereoselective synthesis of tetrasubstituted cyclohexenes from simple unsaturated ketones or thioesters. The method involves a tertiary amine/squaramide-catalyzed α-selective addition of transiently generated trienolates to nitroolefins, subsequent base-catalyzed double bond isomerization, and an intramolecular (vinylogous)
开发了一种催化剂驱动的一锅反应序列,用于从简单的不饱和酮或
硫代酯的对映和非对映选择性合成四取代的
环己烯。该方法涉及将叔胺/方酰胺催化的瞬时生成的
三烯酸酯的α-选择性加成到硝基烯烃中,随后进行碱催化的双键异构化,以及分子内(
乙烯基)的1,6-加成反应,这种稀有的碳环化关键步骤是本质上是完美的立体声控制。