cycloaddition of β-substituted ene- and thioenecarbamates as well as cyclic enamides with quinone diimides catalyzed by a BINOL- and SPINOL-derived phosphoric acid is reported. A wide variety of 2,3-disubstituted 2-aminoindolines, including polycyclic ones, were prepared in generally high yields (up to 98%) with moderate to complete diastereoselectivities and in most cases excellent enantioselectivities
据报道,由BINOL和
SPINOL衍生的
磷酸催化β-取代的烯和
硫代
氨基甲酸酯以及对环二酰胺与醌二
酰亚胺的高度对映和区域选择性(3 + 2)形式环加成反应。通常以高收率(高达98%),中等至完全非对映选择性以及大多数情况下极好的对映选择性(高达99%ee)制备各种2,3-二取代的2-
氨基二氢
吲哚,包括多环
吲哚。