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Communication | Regular issue | Vol 22, No. 11, 1984, pp.2509-2512
Published online, 1st January, 1970
DOI: 10.3987/R-1984-11-2509
Novel Ring-contraction of 5-Anilidene-6-(N-methylanilino)pyrimidine-2,4(3H,5H)-dione

Magoichi Sako, Yutaka Kojima, Kosaku Hirota, and Yoshifumi Maki*

*Gifu Pharmaceutical University, 6-1 Mitahora-higashi 5-chome, Gifu 502-8585, Japan


Treatment of 5-anilidene-6-(N-methylanilino)pyrimidine-2,4(3H,5H)-dione (1) with primary alcohcls without any catalyst causes smooth ring-contraction leading to 4-alkoxycarbonyl-4-anilino-5-(N-methylanilino)imidazol-2(3H,4H)-ones (2) in high yields.