A New General Method for the Asymmetric Synthesis of 4-Alkyl-3-aryl-1,2,3,4-tetrahydroisoquinolines
作者:Jose L. Vicario、Dolores Badía、Esther Domínguez、Luisa Carrillo
DOI:10.1021/jo982008l
日期:1999.6.1
A highly enantioselective method for the synthesis of 4-alkyl substituted 1,2,3,4-tetrahydroisoquinolines is reported. The key step relies on the asymmetric synthesis of alpha-alkylarylacetic acids by alkylation of their corresponding amides employing (S,S)-(+)-pseudoephedrine as chiral inductor. Subsequent Friedel-Crafts acylation, stereocontrolled reductive amination and Pictet-Spengler cyclization
报道了合成4-烷基取代的1,2,3,4-四氢异喹啉的高度对映选择性的方法。关键步骤依赖于通过使用(S,S)-(+)-伪麻黄碱作为手性诱导剂对相应的酰胺进行烷基化来α-烷基芳基丙烯酸的不对称合成。随后的Friedel-Crafts酰化反应,立体控制的还原胺化反应和Pictet-Spengler环化反应可提供优异收率和对映选择性的标题化合物。