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. 2019 Jul 25;15:81. doi: 10.1186/s13007-019-0467-z

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© The Author(s) 2019

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 2 — Preparation scheme of karrikins. a TEMPO, NCS, TBAB; b (EtO)₂POCH₂CO₂Et, NaH; c CF₃COOH; d ClCOOEt, pyridine; e Et₃N, CH₂Cl₂; f Pd(PPh₃)₄, THF; g NBS, CHCl₃; h CH₃B(OH)₂, Pd(OAc)₂, S-Phos, tBuOK, toluene