Copper-Catalyzed Enantioselective Conjugate Addition to α,β-Unsaturated Aldehydes with Various Organometallic Reagents
作者:Sylvie Goncalves-Contal、Ludovic Gremaud、Laëtitia Palais、Lucille Babel、Alexandre Alexakis
DOI:10.1055/s-0035-1562487
日期:2016.10
Reactivity and regio- and enantioselectivities were strongly dependent on reaction conditions and substrates. Good to excellent regio- and enantioselectivities were obtained with zinc reagents R2Zn and aluminum reagents R3Al. However, the asymmetric conjugate addition of Grignard reagents afforded only moderate to good regio- and enantioselectivities. β-Substituted aldehydes constitute a very important
致力于纪念Jean F. Normant教授(1936–2016) 抽象的 β取代的醛构成自然界中非常重要的一类化合物。该基序的合成可以通过在烯醛上形成C–C键来实现。为此,我们在本文中报道了以(R)-H 8 BINAP,(R)-TolBINAP和(R)-SEGPHOS为手性的各种有机金属试剂向α,β-不饱和醛的对映选择性铜催化共轭加成反应的发展。配体。成功开发了三套条件,并使用了几种Enals。反应性以及区域和对映体选择性强烈取决于反应条件和底物。用锌试剂R 2获得良好至优异的区域和对映选择性,锌和铝试剂R 3铝 然而,格氏试剂的不对称共轭添加仅提供中等至良好的区域选择性和对映选择性。 β取代的醛构成自然界中非常重要的一类化合物。该基序的合成可以通过在烯醛上形成C–C键来实现。为此,我们在本文中报道了以(R)-H 8 BINAP,(R)-TolBINAP和(R)-SEGPHOS为手性的各