作者:Ilya A. P. Jourjine、Franz Bracher
DOI:10.1002/ejoc.202300399
日期:2023.7.21
Previous approaches to 4-azafluorenone alkaloid syntheses featuring 2-arylnicotinates are supplemented with tert-butyl hydroperoxide-mediated radical cyclization and/or bromine substituents as latent hydroxy groups which allows for flexible synthesis of highly oxygenated 4-azafluorenone alkaloids, including 5-oxygenated derivatives inaccessible via conventional Friedel-Crafts-type cyclization of 2-arylnicotinates
先前以2-芳基烟酸酯为特征的4-氮杂芴酮生物碱合成方法补充了叔丁基过氧化氢介导的自由基环化和/或溴取代基作为潜在羟基,这使得能够灵活合成高度氧化的4-氮杂芴酮生物碱,包括通过2-芳基烟酸酯的常规Friedel-Crafts型环化无法获得的5-氧化衍生物。给出了 11 个实例,其中 5 个是首次全合成。