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. 2018 Aug 12;7(10):754–763. doi: 10.1002/open.201800036

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© 2018 The Authors. Published by Wiley-VCH Verlag GmbH & Co. KGaA.

This is an open access article under the terms of the http://creativecommons.org/licenses/by-nc-nd/4.0/ License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non‐commercial and no modifications or adaptations are made.

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Scheme 3 — Preparation of compounds 5,9 6,10 and 7.11 Adapted from Ref. 9. Copyright 2001 American Chemical Society.