Synthesis of β-hydroxypiperidine alkaloids by anodic oxidation of carbamates and hydroboration
作者:Mark Plehiers、Claude Hootelé
DOI:10.1139/v96-273
日期:1996.12.1
(±)-pseudoconhydrine, (±)-N-methylpseudoconhydrine, (−)-5-hydroxysedamine, and (+)-sedacryptine were synthesized. Successive functionalization of the piperidine ring via anodic methoxylation allowed the regio- and stereoselective introduction of the substituents. The α and α′ substituents were introduced by application of the sequence elimination–nucleophilic addition from 2- or 2,5-substituted 6-methoxycarbamates
合成了 β-羟基哌啶生物碱 (±)-pseudoconhydrine、(±)-N-methylpseudoconhydrine、(-)-5-hydroxysedamine 和 (+)-sedacryptine。通过阳极甲氧基化对哌啶环进行连续功能化,可以区域选择性和立体选择性地引入取代基。α 和 α' 取代基是通过应用 2- 或 2,5- 取代的 6-甲氧基氨基甲酸酯的序列消除 - 亲核加成引入的。硼氢化 - 烯氨基甲酸酯的氧化,通过从 α-甲氧基氨基甲酸酯中消除甲醇获得,允许引入 β-羟基官能团。关键词:生物碱,景天,N-acyliminium,烯氨基甲酸酯。