Mild and Regioselective Synthesis of 3-CF<sub>3</sub>
-Pyrazoles by the AgOTf-Catalysed Reaction of CF<sub>3</sub>
-Ynones with Hydrazines
作者:Maxim A. Topchiy、Daria A. Zharkova、Andrey F. Asachenko、Vasiliy M. Muzalevskiy、Vyacheslav A. Chertkov、Valentine G. Nenajdenko、Mikhail S. Nechaev
DOI:10.1002/ejoc.201800208
日期:2018.8.1
heterocyclization reactions to selectively give 3‐CF3‐pyrazoles. AgOTf was found to be the catalyst of choice, and various 3‐CF3‐pyrazoles were formed in up to 99 % isolated yield with high regioselectivity. The reaction has a broad scope: 3‐CF3‐pyrazoles with alkyl and aryl substituents as well as different functional groups can be prepared by this approach. The known pyrazole drugs Celebrex® and SC‐560 were efficiently