<i>p</i>-Nitrophenyl Ethylthioester in Enantioselective Organocatalytic Michael Additions: Different Behaviour of β-Aryl and β-Alkyl Enals
作者:Sara Duce、María Jorge、Inés Alonso、José Luis García Ruano、M. Belén Cid
DOI:10.1002/ejoc.201300934
日期:2013.11
Although several nucleophiles derived from arylacetic acids have been described in catalysis via iminium activation, none have presented good enantioselectivity and reactivity with both β-alkyl and β-aryl enals. This study on the Michael addition of p-nitrophenylacetic thioesters suggests that this behavior is due to the different reactivity and distinct tendency to reversibility exhibited by these
虽然已经描述了几种衍生自芳基乙酸的亲核试剂通过亚胺活化催化,但没有一种表现出良好的对映选择性和与 β-烷基和 β-芳基烯醛的反应性。这项关于对硝基苯乙酸硫酯的迈克尔加成的研究表明,这种行为是由于这些类型的烯醛表现出不同的反应性和不同的可逆性趋势。β-烷基和 β-芳基烯醛的条件的独立优化为两种底物提供了良好的产率和对映选择性,提供了迈克尔加合物,这是用于制备各种有趣的芳基乙酸衍生物的通用结构单元。