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Conditions: (i) aq. AcOH, Nafion NR50, 100 °C, 24 h, 70%; (ii) aq. Ga(F3CSO3)3, 100 °C, 24 h, 59%; (iii) aq. F3CCH2OH, F3CSO3H, MW, 90 °C, 1 h, 90%; (iv) TsN3, DBU, MeCN, 0 °C, 1 h, rt, 3–18 h, 53%; (v) MeCN, aq. HEPES buffer, pH 6.5, air; (vi) MeCN, aq. HCOONH4 buffer, pH 7.3–7.4, air.
