|Title:|| CERTAIN 1-HYDROXY-2-PYRIDONES|
|Abstract:||New 1-hydroxy-2-pyridones of the general formula ##SPC1## In which R.sub.1 is alkyl of 1 to 17 carbon atoms, cycloalkyl of 5 to 8 carbon atoms, cyclohexylalkyl or phenalkyl both having 1 to 3 carbon atoms in the alkylene chain or .alpha.-furyl, all of which may be substituted by halogen and R.sub.2 to R.sub.4 are hydrogen or lower alkyl or 2 adjacent substituents together form a trimethylene or tetramethylene chain, and in which R.sub.1 to R.sub.4 together contain at least 2 carbon atoms, are prepared by contacting unsaturated .delta.-keto esters or mixtures thereof with hydroxylamine and subjecting the products to cyclization. The compounds exhibit antimycotic properties.|
|Inventor(s):|| Lohaus; Gerhard (Kelkheim/Taunus, DT), Dittmar; Walter (Hofheim/Taunus, DT) |
|Assignee:|| Hoechst Aktiengesellschaft (Frankfurt am Main, DT) |
1. A 1-hydroxy-2-pyridone of the formula ##SPC5##
wherein R.sub.1 is alkyl of 7 to 11 carbon atoms, cycloalkyl of 5 to 8 carbon atoms, cyclohexylalkyl or phenylalkyl both having 1 to 3 carbon atoms in the alkylene chain and wherein phenylalkyl may be substituted in the phenyl ring by one
chlorine or fluorine atom, or .alpha.-furyl, and R.sub.3 and R.sub.4 are hydrogen or lower alkyl.
2. A compound of the formula II ##SPC6##
in which R.sub.1 is alkyl containing 7 to 11 carbon atoms and R.sub.3 is lower alkyl.