Formal Total Syntheses of the (−)-Salicylihalamides A and B From <scp>d</scp>-Glucose and <scp>l</scp>-Rhamnose
作者:Torsten Haack、KyoungLang Haack、Wibke E. Diederich、Burchelle Blackman、Subho Roy、Srinivas Pusuluri、Gunda I. Georg
DOI:10.1021/jo050750x
日期:2005.9.1
Two formal total syntheses of the (−)-salicylihalamides, based on chiral pool approaches, are reported. d-Glucose and l-rhamnose were used to prepare advanced intermediates 23 and 54, which can be converted in three or four steps, respectively, to the target compounds. The synthesis of 23 from a known d-glucose-derivative was accomplished in 12 steps and 17% overall yield, and the synthesis of 54 from
据报道,基于手性池方法,(-)-水杨酰卤酰胺有两种形式的正式合成方法。d-葡萄糖和1- r-鼠李糖用于制备高级中间体23和54,其可以分别通过三步或四步转化为目标化合物。合成23从已知的d葡萄糖衍生物在12步和17%总产率完成,合成54从已知的升-鼠李糖衍生物以九步法进行,总产率为6%。合成中的关键步骤是开环易位反应,以制备大环系统。已证明酚保护基对于诱导优先形成所需的E异构体是至关重要的。此外,还显示其在C13羟基的保护基团对无显著影响Ë:Ž的闭环复分解反应过程中的比例。