The first example of photoredox strategy for synthesis of phenanthrene skeletons through C(sp3)–H functionalization under external oxidant-free conditions is achieved. This transformation relies on the keto–enol tautomerism of 1,3 dicarbonyl moiety, i.e., the enol form of 1,3-dicarbonyl derivatives with relatively lower oxidation potential can be activated by the excited acridinium photocatalyst. The
A novel tetracyclic compound useful as an immuno-suppressant, represented by general formula (I), or a pharmacologically acceptable salt thereof wherein X¹ and X² may be the same or different from each other and each represents hydrogen or lower alkyl, and n represents an integer of 1 to 4.
<i>N</i>-Bromosuccinimide-Induced C–H Bond Functionalization: An Intramolecular Cycloaromatization of Electron Withdrawing Group Substituted 1-Biphenyl-2-ylethanone for the Synthesis of 10-Phenanthrenol
作者:Ya-Ting Jiang、Zhen-Zhen Yu、Ya-Kai Zhang、Bin Wang
DOI:10.1021/acs.orglett.8b01160
日期:2018.7.6
intramolecular cycloaromatization for the synthesis of 10-phenanthrenols from electron-withdrawing groupsubstituted 1-biphenyl-2-ylethanones is described. The in situ generated bromide was designed to act as an initiator for the radical C–H bond activation. An oxidative cross-dehydrogenative coupling reaction of a highly active C–H bond with an inert C–H bond readily occurs under mild conditions without