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. 2011 May 3;12(5):2853–2890. doi: 10.3390/ijms12052853

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© 2011 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/3.0/).

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Scheme 26. — Preparation of the β³-homo-histidine derivative 102 by Arndt-Eistert homologation of Boc-His(Ts)-OH, followed by Tr-protection and saponification of the methyl ester group in 101 [80].