Studies on the Total Synthesis of Lactonamycin: Synthesis of the Fused Pentacyclic B-F Ring Unit
作者:Sylvain A. Jacques、Simon Michaelis、Björn Gebhardt、Andreas Blum、Nathalie Lebrasseur、Igor Larrosa、Andrew J. P. White、Anthony G. M. Barrett
DOI:10.1002/ejoc.201101317
日期:2012.1
towards the total synthesis of lactonamycin with the elaboration of a key pentacyclic unit. Key steps include the synthesis of benzyl bromide 8 in eight steps and 23 % overall yield starting from 4-methoxyphenol; a high-yielding Suzuki coupling between boronic ester 9 and benzyl bromide 8; and a Lewis acid mediated, intramolecular Friedel–Crafts acylation to obtain the fused BCDEF ring core.
本文描述了一种通过精心设计关键五环单元来全合成内酰胺霉素的方法。关键步骤包括从 4-甲氧基苯酚开始分八步合成苄基溴 8,总产率为 23%;硼酸酯 9 和溴化苄 8 之间的高产 Suzuki 偶联;和路易斯酸介导的分子内 Friedel-Crafts 酰化,以获得融合的 BCDEF 环核心。