ChemInform Abstract: Facile Access to 3,5-Dihalogenated Pyrazoles by Sydnone Cycloaddition and Their Versatile Functionalization by Pd-Catalyzed Cross-Coupling Processes.

✍ Scribed by Thierry Delaunay; Mazen Es-Sayed; Jean-Pierre Vors; Nuno Monteiro; Genevieve Balme

• Publisher: John Wiley and Sons
• Year: 2011
• Weight: 43 KB
• Volume: 42
• Category: Article
• ISSN: 0931-7597
• DOI: 10.1002/chin.201150099

✦ Synopsis

Abstract

The 1,3‐dipolar cycloaddition of 4‐halosydnones (I) with 1‐halopropiolates produces easily separable mixtures of dihalogenated pyrazolylcarboxylic esters (III).