Chiral Phosphoric Acid Catalyzed Atroposelective C−H Amination of Arenes. Issue 17 (3rd March 2020)

• Record Type: Journal Article
• Authors: Xia, Wang; An, Qian‐Jin; Xiang, Shao‐Hua; Li, Shaoyu; Wang, Yong‐Bin; Tan, Bin
• Is Part Of: Angewandte Chemie international edition. Volume 59:Issue 17(2020)
• Page Start: 6775
• Page End: 6779
• Publication Date: 2020-03-03
• Subjects: amination -- atropisomerism -- chiral phosphoric acid -- heterocycles -- organocatalysis; Chemistry -- Periodicals; 540
• DOI: 10.1002/anie.202000585
• Languages: English
• ISSNs: 1433-7851

Abstract

Abstract: N‐arylcarbazole structures are important because of their prevalence in natural products and functional OLED materials. C−H amination of arenes has been widely recognized as the most efficient approach to access these structures. Conventional strategies involving transition‐metal catalysts suffer from confined substrate generality and the requirement of exogenous oxidants. Organocatalytic enantioselective C–N chiral axis construction remains elusive. Presented here is the first organocatalytic strategy for the synthesis of novel axially chiral N‐arylcarbazole frameworks by the assembly of azonaphthalenes and carbazoles. This reaction accommodates broad substrate scope and gives atropisomeric N‐arylcarbazoles in good yields with excellent enantiocontrol. This approach not only offers an alternative to metal‐catalyzed C–N cross‐coupling, but also brings about opportunities for the exploitation of structurally diverse N‐aryl atropisomers and OLED materials. Abstract : In the frame : Presented here is the first organocatalytic strategy for the synthesis of novel axially chiral N‐arylcarbazole frameworks by the assembly of azonaphthalenes and carbazoles. This reaction accommodates broad substrate scope and gives atropisomeric N‐arylcarbazoles in good yields with excellent enantiocontrol. This approach offers opportunities for the exploitation of structurally diverse N‐aryl atropisomers and OLED materials. CPA=chiral phosphoric acid.