What question did this study set out to answer?

To explore a method for synthesizing arylurazoles with both central and C-N axial chirality using asymmetric desymmetrization.

April 10, 2026

Access to arylurazoles bearing both central and C-N axial chirality via asymmetric desymmetrization catalyzed by chiral phosphoric acid

WWWenhui WuDalian University of Technology WLWenkai LiDalian University of Technology YXYongqiang XuDalian University of Technology

Key Points

To explore a method for synthesizing arylurazoles with both central and C-N axial chirality using asymmetric desymmetrization.
Conducted asymmetric desymmetrization of 4-aryl-1,2,4-triazole-3,5-diones (ATADs)
Utilized conjugate addition of pyrazolones
Catalyzed reaction with chiral phosphoric acid
Successfully constructed central and C-N axial chirality in products
Yielded atropisomeric arylurazoles
Demonstrated the effectiveness of chiral phosphoric acid in driving the reaction

Abstract

We report an asymmetric desymmetrization of 4-aryl-1,2,4triazole-3,5-diones (ATADs) through conjugate addition of pyrazolones catalyzed by chiral phosphoric acid. This reaction simultaneously constructs central and C-N axial chirality, affording atropisomeric arylurazoles...

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