. 2017 Aug 22;22(8):1389. doi: 10.3390/molecules22081389
© 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/).
Scheme 4.
Gram-scale synthesis of 2f (a) and 2i (b).