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. 2018 Dec 30;24(1):118. doi: 10.3390/molecules24010118

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© 2018 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/).

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Scheme 7 — Radical mediated cascade alkyne benzannulations to arrive at (a) NG 32 [40], (b) helical NGs 34/35 [42], and (c) olympicene 37 [44].