Enantioselective Organocatalytic Construction of Hexahydropyrroloindole by Means of α‐Alkylation of Aldehydes Leading to the Total Synthesis of (+)‐Gliocladin C
作者:Jin Song、Chang Guo、Arafate Adele、Hao Yin、Liu‐Zhu Gong
DOI:10.1002/chem.201204522
日期:2013.3.4
12‐Step program: The combined use of cinchona alkaloid based amine and chiral phosphoric acid enabled the asymmetric alkylation reaction of 3‐hydroxyoxindoles with aldehydes to give 3,3′‐disubstituted oxindoles in excellent enantioselectivities, which allows for the enantioselective total synthesis of (+)‐gliocladin C in 12 steps from 3‐hydroxyoxindole with 19 % overall yield (see scheme; PMB=para‐methoxybenzyl)
12步程序:金鸡纳生物碱基胺和手性磷酸的组合使用可使3-羟基羟吲哚与醛的不对称烷基化反应产生极佳的对映选择性的3,3'-二取代的羟吲哚,从而可以实现( +)-神经胶蛋白C从3-羟基羟吲哚起12步,总收率19%(参见方案; PMB =对-甲氧基苄基)。