Efficient organocatalytic asymmetric synthesis of 2-amino-4H-chromene-3-carbonitrile derivatives
作者:Yu Gao、Wen Yang、Da-Ming Du
DOI:10.1016/j.tetasy.2012.02.019
日期:2012.3
enantioselective tandem Michael addition–cyclization of malononitrile to nitroalkenes for the direct synthesis of chiral 2-amino-4H-chromene-3-carbonitrile derivatives was investigated. Good yields and enantioselectivities (up to 91% ee) were achieved. This organocatalytic asymmetric tandem Michael addition–cyclization provides an efficient routetoward the synthesis of optically active functionalized chromenes
Enantioselective synthesis of 2-amino-4-(nitromethyl)-4<i>H</i>-chromene-3-carbonitriles from 2-iminochromenes
作者:Gamze Koz、Omer Koz、Necdet Coskun
DOI:10.1080/00397911.2016.1177728
日期:2016.5.18
ABSTRACT A series of medicinally important 2-amino-4-(nitromethyl)-4H-chromene-3-carbonitriles were synthesized using enantioselective conjugateaddition of nitromethane to 2-iminochromenes. The reactions were performed using L8-Cu (II) catalytic system and moderate to good enantioselectivities (62–88%) and yields (66–96%) were obtained. GRAPHICAL ABSTRACT
摘要 利用硝基甲烷与 2-亚氨基色烯的对映选择性共轭加成,合成了一系列具有药用价值的 2-氨基-4-(硝基甲基)-4H-色烯-3-腈。使用 L8-Cu (II) 催化体系进行反应,获得了中等至良好的对映选择性 (62-88%) 和产率 (66-96%)。图形概要