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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 24. — Diastereoselective aldol reaction of (R)-92 with 1,3,5-trioxane. Further transformation towards the formation of β²-homo-histidine derivatives led to the formation of compound 95 [80].