Enantioselective Catalytic Domino Aza-Michael-Henry Reactions: One-Pot Asymmetric Synthesis of 3-Nitro-1,2-dihydroquinolines via Iminium Activation
作者:Hao Luo、Xilong Yan、Ligong Chen、Yang Li、Na Liu、Guohui Yin
DOI:10.1002/ejoc.201501618
日期:2016.3
Asymmetric transformations arising from iminium activation of aromatic aldehydes are uncommon. In this work, an enantioselective organocatalytic domino aza-Michael–Henry reaction between N-(2-formylphenyl)sulfonamides and trans-β-nitro olefins through iminium activation has been presented. This reaction proceeded smoothly to give chiral 3-nitro-1,2-dihydroquinolines in high yields with up to 88 % ee
由亚胺活化芳香醛引起的不对称转化并不常见。在这项工作中,提出了 N-(2-甲酰基苯基)磺酰胺和反式-β-硝基烯烃通过亚胺活化的对映选择性有机催化多米诺氮杂-迈克尔-亨利反应。该反应顺利进行,在温和条件下以高产率得到手性 3-硝基-1,2-二氢喹啉,ee 高达 88%。此外,一项初步研究表明,2-巯基苯甲醛衍生物可以与反式-β-硝基烯烃参与硫杂-迈克尔-亨利反应,生成手性 3-硝基-2H-硫色素烯。