. 2015 Dec 23;21(1):19. doi: 10.3390/molecules21010019
© 2015 by the authors.
Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons by Attribution (CC-BY) license (http://creativecommons.org/licenses/by/4.0/).
Scheme 8.
Mechanism of the Ugi 4-component reaction.