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. 2015 Jan 19;13(1):655–665. doi: 10.3390/md13010655

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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 2 — Synthesis of the aminopyridiniminoquinone 3. (a): Bromoacetylbromide, THF, Et₃N, reflux, 2 days, 65%; (b): dimethylacryloylchloride, pyridine, 2h, 78%; (c): (i) AlCl₃, DCM, 24 h, 83%; (d): (i) HNO₃, DCM/DMF, 24 h, 42%; (ii) H₂, Pd/C, DMF/DMSO, 18 h, 70%; (e): BH₃/THF, THF, 2 h, reflux, 81%.