Asymmetric Palladium(II)-Catalyzed Cascade Reaction Giving Quaternary Amino Succinimides by 1,4-Addition and a Nef-Type Reaction
作者:Manuel Weber、Wolfgang Frey、René Peters
DOI:10.1002/anie.201307334
日期:2013.12.9
transforms mixtures of racemic N‐benzoyl α‐amino acids, nitroolefins, acetic anhydride, and manganese acetate into biologically interesting quaternary aminosuccinimides. The products are obtained as single diastereomers in enantioenriched form. Key steps of the cascade mechanism are a 1,4‐addition of in situ generated azlactones to nitroolefins and a Nef‐type reaction.
简单的起始原料,高价值的产品:一种基于二核二茂铁的Pd II复合物,将外消旋的N-苯甲酰基α-氨基酸,硝基烯烃,乙酸酐和乙酸锰的混合物转变成生物学上有意义的季氨基琥珀酰亚胺。产物以对映体富集的形式作为单一非对映体获得。级联机理的关键步骤是在硝基烯烃中原位生成的内酯1,4加成和Nef型反应。