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. 2017 Jul 13;7(3):31. doi: 10.3390/life7030031

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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 4 — Ligation of glycine (Gly), alanine (Ala), and aspartic acid (Asp) to afford their corresponding dipeptides under aqueous conditions promoted by cyclotrimetaphosphate (cTMP). Serine (Ser) affords the O-phosphorylated product 12.