. 2016 Jul 21;21(7):951. doi: 10.3390/molecules21070951
© 2016 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/).
Scheme 5.
Cu-catalyzed arylation of cyclo-(Trp-Phe) 23.