Abstract
Reaction of N-(1-pyrrolidinyl)-, N-(1-piperidinyl)-, N-(4-morpholinyl)-, and N-(1-hexahydroazepinyl)-thioureas with propiolic acid gives hetero-N-spiro-4′-(2′-amino-Δ2-1′,3′,4′-thiadizolin-4′-io-5′-acetates), which rearrange in acetic anhydride to 2-(N-heteryl)imino-2,3-dihydro-4H-1,3-thiazin-4-ones.
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V. Ya. Kauss, A. F. Mishnev, and I. Ya. Kalvin'sh, Khim. Geterotsikl. Soedin., No. 12, 1674 (1992).
K. A. Jensen, U. Anthoni, B. Kagi, Ch. Larsen, and C. Pedersen, Acta Chem. Scand., 22, No. 1, 1 (1968).
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Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 2, pp. 263–265, February, 1993.
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Kauss, V.Y., Kalvin'sh, I.Y. Spirocyclic betaines or 2-amino-Δ2-1,3,4-thiadiazoline-5-acetic acid and their rearrangement in acetic anhydride. Chem Heterocycl Compd 29, 231–233 (1993). https://doi.org/10.1007/BF00531673
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DOI: https://doi.org/10.1007/BF00531673