The coupling of esters (III) with diazonium salts (IV) affords substituted oxofuranones (V) in moderate to good yields.Oxazolone and imidazolone analogues are obtained via similar methodologies. -(MELNICKY, R.; KVAPIL, L.; SLEZAR, P.; GREPL, M.; HLAVAC, J.; LYCKA, A.; HRADIL*, P.; J.

Coupling of various substituted phenacyl acetates 1 and diazonium salts 3 was studied. If the phenacyl acetates were substituted by an electronaceptor group such as CN or COOEt 3-substituted phenyl-5-(phenyl-hydrazono)-5H-furan-2-ones 4 were formed. Also synthesis of aza and diaza analogs is described. The compounds were characterized using MS and NMR spectroscopy.