Condensation of 5-hydroxy-2-methyl-4H-pyran-4-one with arylglyoxals. Synthesis and properties of 2-aryl-1-(3-hydroxy-6-methyl-4-oxo-4H-pyran-2-yl)ethane-1,2-diones

A convenient method was developed for the synthesis of previously unknown 1,2-diketones, based on the condensation of 5-hydroxy-2-methyl-4H-pyran-4-one with arylglyoxals. The study demonstrated the possibility of using these compounds to synthesize nitrogen-containing hetero cyclic systems bearing the 3-hydroxypyran-4-one moiety.