Mannich-type Friedel-Crafts reaction between indoles and ethyl glyoxylate imines proceeded spontaneously in the absence of an acid catalyst. Ethyl alpha-(3-indolyl)glycinates were obtained in moderate to high yields. Reaction with (R)-alpha-methylbenzylamine derived imine afforded chiral alpha-(3-indolyl)glycinates with good diastereoselectivities (up to 96:4).
吲哚和
乙醛酸乙酯亚胺之间的曼尼希型傅克反应在没有酸催化剂的情况下自发进行。以中等至高产率获得 α-(3-
吲哚基) 甘
氨酸
乙酯。与 (R)-α-甲基
苄胺衍生的
亚胺反应得到具有良好非对映选择性(高达 96:4)的手性 α-(3-
吲哚基)甘
氨酸盐。