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. 2019 Jul 19;34(1):1347–1367. doi: 10.1080/14756366.2019.1642883

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© 2019 The Author(s). Published by Informa UK Limited, trading as Taylor & Francis Group.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Scheme 1. — (a) Reagents and conditions: (i) dioxane, rt, 1 h. (b) Reagents and conditions: (i) NH₂NH₂ 99%, propanol, 2 h (ii) POCl₃, reflux 70 °C, 2 h (iii) p-phenylenediamine, butanol, 110 °C, 1 h, (iv) benzoyl chlorides, acetonitile, triethylamine, 6 h (v) arylisocyanates, DMF, reflux, 8 h, (vi) 1a–c, Cs₂CO₃, acetonitrile, reflux, 6 h, (vii) piperazines, K₂CO₃, KI, ethanol, reflux, 3 h.