Diazirines as Potent Electrophilic Nitrogen Sources: Application to the Synthesis of Pyrazoles
作者:Yoann Schneider、Julie Prévost、Maëlle Gobin、Claude Y. Legault
DOI:10.1021/ol403495e
日期:2014.1.17
Even after more than 50 years since its discovery, the electrophilic potential of diazirines was never truly exploited. This longstanding limitation has been resolved. N-Monosubstituted diaziridines and hydrazones are obtained by nucleophilic additions. They release, under hydrolysis conditions, the corresponding monosubstituted hydrazines. The latter were converted to pyrazoles in high yields. The
TBAX/Oxone‐Mediated Halogenation of Pyrazoles and Other Heterocycles: An Entry to Important Cross‐Coupling Reactions
作者:Jaspreet Kour、Pratiksha Khajuria、Alpa Sharma、Sanghapal D. Sawant
DOI:10.1002/asia.202200778
日期:2022.11.16
A facile green approach has been established for halogenation of pyrazoles and different heterocycles via a microwave-mediated protocol using TBAX/Oxone in EtOH. Applications and extension of the method have been demonstrated by presenting various coupling reactions of halogenated pyrazoles.