The asymmetric domino oxa-Michael–Henry reaction of salicylaldehyde derivatives with trans-β-nitro olefins catalyzed by a readily available trans-4-hydroxy-L-prolinamide with 4-nitrophenol as an effective cocatalyst is presented. The corresponding 3-nitro-2H-chromenes were obtained in moderate to excellent yields (up to 99 %) and with up to 90 % ee under mild conditions. In addition, a preliminary
介绍了
水杨醛衍
生物与反式-β-硝基烯烃的不对称多米诺 oxa-Michael-Henry 反应,该反应由易于获得的
反式-4-羟基-L-脯
氨酰胺和 4-
硝基苯酚作为有效的助催化剂催化。相应的
3-硝基-
2H-色烯在温和条件下以中等至极好的收率(高达 99%)和高达 90% 的 ee 获得。此外,初步研究表明,这种有机催化系统能够促进 2-甲酰基
吡咯衍
生物与反式-β-硝基烯烃的多米诺氮杂-迈克尔-亨利反应,得到手性 2-硝基-
3H-吡咯烷。