Asymmetric Mannich reaction: highly enantioselective synthesis of 3-amino-oxindoles <i>via</i> chiral squaramide based H-bond donor catalysis
作者:Kadiyala Srinivasa Rao、Pambala Ramesh、L. Raju Chowhan、Rajiv Trivedi
DOI:10.1039/c6ra16877a
日期:——
catalyzed by chiral Cinchona alkaloid based squaramide containing H-bond donor catalysts, wherein, the reaction of 1,3-diketones with isatin (N-Boc) ketimines led to the formation of 3-aminooxindole derivatives. These derivatives were obtained in high yields with excellent enantioselectivities under mild conditions using 3 mol% of the catalyst. This protocol provides valuable and easy access to chiral 3-substituted
我们在这里描述了一种简单且容易的不对称曼尼希反应,该反应是由手性基于金鸡纳生物碱的方胺类含H键供体催化剂催化的,其中1,3-二酮与Isatin(N -Boc)酮亚胺的反应导致3-氨基氧吲哚的形成衍生品。使用3摩尔%的催化剂,在温和条件下以高收率获得优异的对映选择性,获得了这些衍生物。该协议为手性3-取代的3-氨基羟吲哚衍生物提供了有价值且容易获得的途径。