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. 2020 Sep 23;25(19):4365. doi: 10.3390/molecules25194365

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© 2020 by the author.

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 5 — Preparation of protected 6-l-[¹⁸F]FDOPA via mesytil(aryl)iodonium salt precursor (X = Tos, BF₄); conditions: 18-crown-6/K₂CO₃, azeotropic drying; [Mes-IDOPA]BF₄ (12 μmol), (CH₃CN)₄CuOTf (12 μmol), DMF (0.7 mL) [70].