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Use of dodecanoyl isothiocyanate as building block in synthesis of target benzothiazine, quinazoline, benzothiazole and thiourea derivatives

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Abstract

Dodecanoyl isothiocyanate (I) reacts additively with anthranilic acid to afford derivatives of thiourea II and benzothiazine IIIin a one-pot reaction. The cyclisation of thiourea II was achieved using acetic anhydride to form quinazoline derivative IV. The heating of quinazoline IV in acetic anhydride or butan-1-ol gave quinazoline derivatives V or VI, respectively. Benzothiazine III underwent trans-acylation to benzothiazine VII in boiling acetic anhydride. The treatment of IV with hydrazine hydrate, anthranilic acid or ethyl carbazate afforded derivatives of triazoloquinazoline VIII, quinazolinoquinazoline XI or thiosemicarbazide X, respectively. The reaction of I with 2-aminophenol or 2-aminothiophenol afforded thiourea derivative XIII or benzothiazole derivative XIV, respectively. Most of the synthesised compounds bear a lauroyl (dodecanoyl) group (a hydrocarbon moiety). The structures of the synthesised compounds were confirmed by microanalytical and spectral data.

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Hemdan, M.M., El-Bordany, E.A. Use of dodecanoyl isothiocyanate as building block in synthesis of target benzothiazine, quinazoline, benzothiazole and thiourea derivatives. Chem. Pap. 70, 1117–1125 (2016). https://doi.org/10.1515/chempap-2016-0042

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