作者:Raghavender Boda、Gregory D. Cuny
DOI:10.1016/j.tet.2022.133146
日期:2022.12
Pallimamine (1) is a structurally unique quaternary carbon-containing pentacyclic tetrahydroberberine. Synthesis of key C13-disubstituted tetrahydroberberine intermediates, as separable diastereomeric isomers, was achieved using a formal [4 + 2] cycloaddition of 4-methylhomophthalic anhydrides with 6,7-dimethoxy-3,4-dihydroisoquinolin-8-ol. Intramolecular Mitsunobu reactions provided installation of
Pallimamine ( 1 ) 是一种结构独特的含季碳的五环四氢小檗碱。使用 4-methylhomophthalic 酸酐与 6,7-dimethoxy-3,4-dihydroisoquinolin-8-ol 的正式 [4 + 2] 环加成反应,合成了关键的 C13-二取代四氢小檗碱中间体,作为可分离的非对映异构体。分子内 Mitsunobu 反应提供了生成二氢吡喃的 pallimamine ( 1 ) 及其非天然非对映异构体epi -pallimamine ( 33 ) 的安装。