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. Author manuscript; available in PMC: 2019 Apr 1.
Published in final edited form as: Bioorg Med Chem Lett. 2018 Feb 16;28(6):1011–1019. doi: 10.1016/j.bmcl.2018.02.031

Scheme 3.

Scheme 3

Synthesis of radiolabeling precursors. Reagents and conditions: (a) MOMBr, Et3N, CH2Cl2; (b) 2-methoxyisonicotinaldehyde, TsNH2, toluene, 130 °C; (c) CF3COOH, CH2Cl2.