Nouvelle voie d'acces aux β-nitroenones premiere preparation de β-nitroenones acycliques
摘要:
We describe here a new and mild method of synthesis of acyclic beta-nitroenones. Nitroepoxydes IVunderbar, prepared by epoxydation of the allylic nitroolefins IIIunderbar, react with silicagel or aluminium isopropoxide according to the substrate, to give the nitroethylenic alcohols Vunderbar. Their oxydation by PCC under sonication leads to the beta-nitroenones VIunderbar.
Nouvelle voie d'acces aux β-nitroenones premiere preparation de β-nitroenones acycliques
摘要:
We describe here a new and mild method of synthesis of acyclic beta-nitroenones. Nitroepoxydes IVunderbar, prepared by epoxydation of the allylic nitroolefins IIIunderbar, react with silicagel or aluminium isopropoxide according to the substrate, to give the nitroethylenic alcohols Vunderbar. Their oxydation by PCC under sonication leads to the beta-nitroenones VIunderbar.
A new synthesis of 2-isoxazoline2-oxides starting from unsaturated nitro compounds is described. A facile and convenient preparation of β-alkyl substituted β-nitroenones and their conversion to β-nitrosulfides are recorded. Treatment of these compounds with potassium tert-butoxide at −78°C followed by immediate quenching with acetic acid provides access to 5-hydroxy-4-(phenylthio)-2-isoxazoline 2-oxides