Scheme 1.
Reaction conditions: (i),27 (ii) 2 or 3 (0.05 mmol), AgOTf (0.075 mmol), AgF (0.025 mmol), MeOH (1 mL), rt in the dark 12 h; (iii) 2 (0.05 mmol), AgOTf (0.125 mmol), AgF (0.025 mmol), MeOH (1 mL), rt in the dark 12 h.
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