Rhodium(III)‐Catalyzed ortho‐Heteroarylation of Phenols through Internal Oxidative CH Activation: Rapid Screening of Single‐Molecular White‐Light‐Emitting Materials. (25th September 2015)

• Record Type: Journal Article
• Authors: Li, Bijin; Lan, Jingbo; Wu, Di; You, Jingsong
• Is Part Of: Angewandte Chemie. Volume 127:Number 47(2015)
• Page Start: 14214
• Page End: 14218
• Publication Date: 2015-09-25
• Subjects: Heterocyclen -- Kreuzkupplungen -- Organische Materialien -- Oxidationen -- Rhodium; Chemistry -- Periodicals; 540
• DOI: 10.1002/ange.201507272
• Languages: English
• ISSNs: 0044-8249

Abstract

Abstract: Reported herein is the first example of a transition‐metal‐catalyzed internal oxidative CH/CH cross‐coupling between two (hetero)arenes through a traceless oxidation directing strategy. Without the requirement of an external metal oxidant, a wide range of phenols, including phenol‐containing natural products, can undergo the coupling with azoles to assemble a large library of highly functionalized 2‐(2‐hydroxyphenyl)azoles. The route provides an opportunity to rapidly screen white‐light‐emitting materials. As illustrative examples, two bis(triphenylamine)‐bearing 2‐(2‐hydroxyphenyl)oxazoles, which are difficult to access otherwise, exhibit bright white‐light emission, high quantum yield, and thermal stability. Also presented is the first example of the white‐light emission, in a single excited‐state intramolecular proton transfer system, of 2‐(2‐hydroxyphenyl)azoles, thus highlighting the charm of CH activation in the discovery of new organic optoelectronic materials. Abstract : Strahlendes Weiß : Durch eine Rh III ‐katalysierte C‐H/C‐H‐Kreuzkupplung zwischen Phenolen und Azolen werden hoch funktionalisierte 2‐(2‐Hydroxyphenyl)azole aufgebaut. Die Methode nutzt eine spurlose dirigierende Gruppe, die zudem als Oxidationsmittel fungiert, und sie bietet sich für ein schnelles Screening von weiß leuchtenden Molekülen an. TPA=Triphenylamin‐Substituent.