Renaissance of 1,2,5-Oxadiazolyl Diazonium Salts: Synthesis and Reactivity
A new approach for the synthesis and reactivity of the 1,2,5-oxadiazolyl diazonium salts is represented. A simple and direct protocol to previously inaccessible furoxanyl and furazanyl diazonium salts was developed for the first time. Azo coupling reactions of thus obtained diazonium salts with a series of structurally diverse CH-acids have been also successfully performed. Therefore, this study reveals new horizons for the use of furoxanyl and furazanyl diazonium salts in organic chemistry.