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Reactions of Acylpyruvic Acids and 2,3-Dihydrofuran-2,3-diones with 2,3-Diaminopyridine. -Acylpyruvic acids (I) and diones (IV) react with 2,3-diaminopyridine (II) to give (Z)-3-acylmethylenepyridopyrazinones (III) and their regioisomers (V), respectively. The structure of the obtained azines, which exhibit bacteriostatic activity, and reaction chemoselectivity are discussed. -(SOF'INA, O. A.; IGIDOV, N. M.; KOZ'MINYKH, E. N.; TRAPEZNIKOVA, N. N.; KASATKINA, YU. S.; KOZ'MINYKH, V. O.; Russ.

Chemistry of 2-Methylene-2,3-dihydrofuran-3-ones. Part 18. Reaction of Oxalyl Chloride with Acetophenone and Dibenzoylmethane. -Reaction of the title carbonyl compounds (I) and (IV) with excess amounts of oxalyl chloride is shown to furnish heterocyclization products (III) and (V)/(VI), respectively. -(KOZ'MINYKH, E. N.; TRAPEZNIKOVA, N. N.; CHUPILOVA, E. A.; IGIDOV, N. M.; KOZ'MINYKH, V. O.; Russ. J. Org.

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