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Abstract
Dehydroascorbic acid (DHA) and glycylglycine (30 mmol each) were heated in 100ml of water at 90°C for 3 hr. The resulting brown solution was shaken with chloroform, and the aqueous layer was extracted with ethyl acetate. Yellow crystals were isolated from the ethyl acetate extract in 1-2% yields. The crystals were identified as N-(2-pyron-3-yl) glycylglycine by elemental analysis, UV, IR, MS, PMR and CMR spectroscopy. DHA also produced pyrone derivatives with glycylalanine, glycylleucine, alanylglycine, leucylglycine and β-alanylglycine.
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