Photochemical Synthesis of 1,4-Dicarbonyl Bifluorene Compounds via Oxidative Radical Coupling Using TEMPO as the Oxygen Atom Donor
作者:Jincheng Xu、Aishun Ding、Yanbin Zhang、Hao Guo
DOI:10.1021/acs.joc.0c02781
日期:2021.2.19
visible-light-induced metal-free synthesis of 1,4-dicarbonyl compounds from alkyne-containing aryl iodides via photochemical C–I bond cleavage, intramolecular cyclization, oxidation, and intermolecular radical coupling sequence is reported. TEMPO was employed as the oxygen atom donor in this transformation. This protocol provided a new strategy for the synthesis of 1,4-dicarbonyl bifluorene compounds.
Light-Induced Intramolecular Iodine-Atom Transfer Radical Addition of Alkyne: An Approach from Aryl Iodide to Alkenyl Iodide
作者:Yanbin Zhang、Jincheng Xu、Hao Guo
DOI:10.1021/acs.orglett.9b03519
日期:2019.11.15
reported toward iodine-substituted fluorene derivatives. A thioxanthone derivative was employed as a visible light sensitizer for this 5-exo-dig exclusive radical addition, and the newly formed vinyl iodide compounds were further proved to be effective partners for several cross-coupling reactions.
A range of phenanthrene derivatives were efficiently synthesized by the palladium-catalyzed annulation of 2,2′-diiodobiphenyls with alkynes. The scope, limitations and regioselectivity of the reaction were investigated. The described method was adopted to synthesize 9,10-dialkylphenanthrenes, sterically overcrowded 4,5-disubstituted phenanthrenes and phenanthrene-based alkaloids. Reactions of highly
申请人:The United States of America as represented by the Secretary of the Air
公开号:US04683340A1
公开(公告)日:1987-07-28
Bis(benzilyloxy) compounds having the general formula ##STR1## wherein Ph is --C.sub.6 H.sub.5 and Ar is Ph, --C.sub.6 H.sub.4 Br, --C.sub.6 H.sub.4 CH.sub.3 or --C.sub.6 H.sub.4 C.sub.2 H.sub.5. These compounds can be reacted with bis(o-diamines) to form polyquinoxalines which can be converted to thermally stable compositions by non-volatile, intramolecular cyclization.