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. 2021 Feb 18;26(4):1055. doi: 10.3390/molecules26041055

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© 2020 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 (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Scheme 15 — Synthetic pathways to prepare methyl-2-[3-(3-phenylquinoxalin-2-ylsulfanyl)propanamidoalkanoates (50) and N-alkyl-3-((phenylquinoxalin-2-yl sulfanyl)propanamides (51) with reagents and conditions: (a) NH₂NH₂/C₂H₅OH/78 °C/reflux/4 h, (b) NaNO₂/HCl/H₂O/reflux/15 min, (c) NH₂(CH₂)nCHRCOOCH₃.HCl/triethylamine/ethyl acetate/25 °C/24 h, (d)NHR1R2/ethyl acetate/25 °C/24 h.