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. 2017 Sep 13;45(18):10380–10392. doi: 10.1093/nar/gkx803

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© The Author(s) 2017. Published by Oxford University Press on behalf of Nucleic Acids Research.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by-nc/4.0/), which permits non-commercial re-use, distribution, and reproduction in any medium, provided the original work is properly cited. For commercial re-use, please contact journals.permissions@oup.com

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Scheme 1. — (A) Structures of a RFP (upper) and a DNA mimic of RFP composed of a DNA G-quadruplex and a synthetic RFP chromophore analogue (bottom). Chromophores are emphasized in red. (B) Chemical structures of the chromophores in RFPs. (C) Structures of the RFP chromophore analogues synthesized in this study. (D) Synthetic route of the RFP chromophore analogues using the following reagents and conditions: a) hexamethylenetetramine, TFA, 120°C, 12 h; b) N-Acetylglycine, anhydrous sodium acetate, acetic anhydride, 120°C, 4 h; c) 40% aq. CH₃NH₂, K₂CO₃, EtOH, 80°C, 4 h; and d) ZnCl₂, THF, RCHO, 80°C.