BF 3 ·CH 3 NO 2介导的多烯级联环化反应。通过非功能化3°烯烃的阳离子引发直接立体定向合成多环中间体的非常规高效方法。在(±)-紫杉二酮的全合成中的应用。
摘要:
BF 3气体在硝基甲烷中的便捷储备溶液已显示出可促进“ H +催化”多烯环化反应,并以极佳的区域和立体控制水平进行。甲直接这种新方法的用于实现阳离子polyannulations若干现代以及经典程序相比,已经结论性地确定的BF的制备优点3 ·CH 3 NO 2平台。描述了这些新条件用于阳离子多环化的简明全合成抗肿瘤药(±)-紫杉二酮。
Total Synthesis and Biological Evaluation of an Antifungal Tricyclic <i>o</i>-Hydroxy-<i>p</i>-Quinone Methide Diterpenoid
作者:Jinhua Huang、Dylan Foyle、Xiaorong Lin、Jiong Yang
DOI:10.1021/jo4013964
日期:2013.9.20
A convergent route has been developed to synthesize an antifungal tricyclic o-hydroxy-p-quinone methide diterpenoid and ana- logues. A Li/naphthalene-mediated reductive alkylation was employed for coupling beta-cyclocitral and the corresponding benzyl chloride, while a BBr3- mediated one-pot bis-demethylation and intramolecular Friedel Crafts alkylation was used to assemble the tricyclic molecular skeleton. The structure activity relationship of the diterpenoid was assessed on the basis of antiproliferation assays of the natural product and analogues against strains of pathogenic yeasts and filamentous fungi.