The reaction of α-angelica lactone with alkylamines under aqueous conditions afforded 5- hydroxy-5-methylpyrrolidinones in high yield. When the reaction was carried out under anhydrous conditions, the only products obtained were the corresponding 4-oxopentanoic acid amides. Treatment of either class of compound with triflic anhydride (Tf2O) in pyridine resulted in the formation of various substituted sulfonamidofurans. The suggested ...
