. 2018 Jan 25;14:203–242. doi: 10.3762/bjoc.14.15
Copyright © 2018, Aggarwal and Kumar
This is an Open Access article under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
The license is subject to the Beilstein Journal of Organic Chemistry terms and conditions: (https://www.beilstein-journals.org/bjoc/terms)
Scheme 4.
Synthesis of coumarin-based isomeric tetracyclic pyrazolo[3,4-b]pyridines.