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. 2017 Jun 2;22(6):924. doi: 10.3390/molecules22060924

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© 2017 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 12 — Synthesis of ring E modified GA derivatives 131–155. Reagents and conditions: (a) (i) amino acid methyl ester EDCI/HOBt/Et₃N, DMF; (ii) 4N NaOH THF/MeOH; (b) EDCI/HOBt/Et₃N DMF, r.t., overnight; (c) EDCI/HOBt/Et₃N DMF, r.t., overnight.