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. 2018 Apr 30;33(1):867–878. doi: 10.1080/14756366.2018.1462802

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© 2018 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. — Synthesis of the hydrazonoindolin-2-ones 3a-e, 5a-e, and 7a-c. Reagents and conditions: (i) Methanol, glacial acetic acid (cat.), reflux, 4 h.