Synthesis of pyrazoles with fluorinated side-chain by cyclization of fluoroalkylated triketides
作者:Willi Desens、Marleen Winterberg、Stefan Büttner、Dirk Michalik、Ashot S. Saghyan、Alexander Villinger、Christine Fischer、Peter Langer
DOI:10.1016/j.tet.2013.02.059
日期:2013.4
The cyclization of fluoroalkylated 3,5-dioxoesters with hydrazines, carried out in glacial acetic acid, afforded pyrazines with fluoroalkylated side-chain. The cyclization of 3,5-dioxoesters with hydroxylamine afforded hydroxylated fluoroalkylated dihydroisoxazoles. All reactions proceeded with good to very good regioselectivity.