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Communication | Special issue | Vol 8, No. 1, 1977, pp.193-197
Published online, 1st January, 1970
DOI: 10.3987/S(S)-1977-01-0193
Synthesis of 6-(2-Phenylethenyl)-2H-pyran-2-one

Yoshinori Tominaga, Atsuyuki Ushirogochi, Yoshiro Matsuda, and Goro Kobayashi*

*Faculty of Pharmaceutical Sciences, Nagasaki University, 1-14, Bunkyo-machi, Nagasaki 852-8521, Japan


3-Cyano-4-methylthio-6-(2-phenylethenyl)-2H-pyran-2-ones (IIIa, b, c) were synthesized by the reaction of benzalacetone derivatives with methyl 2-cyano-3,3-bis(methylthio)acrylate in the presence of powdered potassium carbonate. Compounds III easily reacted with alkoxy anions and amines to give the corresponding 4-substituted 2H-pyran-2-one derivatives (dehydrokawain and yangonin derivatives).