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Ringschlußreaktionen von 2-Acyl-1-chlor-enaminen mit thioamidfunktionellen Verbindungen: Wahlweiser Zugang in die 1,3-Thiazin- und 1,3-Oxazin-Reihe

Cyclization reactions of 2-acyl-1-chloro-enamines with thioamide functional compounds: Alternative access to the 1,3-thiazine and 1,3-oxazine series

  • Organische Chemie Und Biochemie
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Monatshefte für Chemie / Chemical Monthly Aims and scope Submit manuscript

Abstract

2-Acyl-1-chloro-enamines2 react with thioureas to 2,6-diamino-1,3-thiazinium salts3, following the usual transformation mode of 1-heterosubstituted acylvinylchloridesA. On the other hand the reaction of2 with thiobenzamide preferably leads to 4-amino-1,3-oxazinium salts7. The last course is discussed in terms of imidoyl-migration in the primary productE formingF, which finally undergoes ring condensation. This assumption corresponds in the best way with all experimental findings, moreover with special model reactions (e.g.213).

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Herrn Prof. Dr.Klaus Hafner zum 60. Geburtstag gewidmet.

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Spitzner, R., Freitag, S. & Schroth, W. Ringschlußreaktionen von 2-Acyl-1-chlor-enaminen mit thioamidfunktionellen Verbindungen: Wahlweiser Zugang in die 1,3-Thiazin- und 1,3-Oxazin-Reihe. Monatsh Chem 118, 1383–1394 (1987). https://doi.org/10.1007/BF00810643

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  • DOI: https://doi.org/10.1007/BF00810643

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