1-ACYL-3-HYDROXY-1H-PYRAZOLES AND RELATED DERIVATIVES AS USEFUL ACYLATING AGENTS
Vladimir Kepe, Slovenko Polanc, and Marijan Koèevar
Faculty of Chemistry and Chemical Technology, University of Ljubljana, Aškerèeva 5, 1000 Ljubljana, Slovenia
A general application of 1-acyl-3-hydroxy-1H-pyrazoles 5 as useful acylating agents for alcohols or phenols, amines and hydrazines is described. The use of a hydrazide for a direct acylation of an alcohol in the presence of 4-ethoxymethylene-2-phenyl-5(4H)-oxazolone (1) is also discussed.