. 2016 Oct 23;32(1):169–175. doi: 10.1080/14756366.2016.1243536
© 2016 The Author(s). Published by Informa UK Limited, trading as Taylor & Francis Group
This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/Licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Scheme 1.
Synthesis of compounds 1–9.