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. 2015 Aug 21;20(8):15287–15303. doi: 10.3390/molecules200815287

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© 2015 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/4.0/).

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Scheme 1 — Synthesis of 2,7,9-trisubstituted-3-(aryldiazenyl)-3H-imidazo[1′,2′:1,5] pyrazolo[3,4-b]pyridine (5a–l).

graphic file with name molecules-20-15287-i001.jpg — Synthesis of 2,7,9-trisubstituted-3-(aryldiazenyl)-3H-imidazo[1′,2′:1,5] pyrazolo[3,4-b]pyridine (5a–l).