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Reaction conditions: 1 (0.1 mmol) and 2a (1.8 equiv.) were added, then 3a (1.8 equiv.) was added slowly, and stirred at room temperature for the corresponding time (detected by TLC or solidification).
Reaction conditions: 1 (0.1 mmol) and AgTFA (2 mol%) in MeCN (3 mL) was added to 2a (1.8 equiv.) and 3a (1.8 equiv.), then stirred at 60 °C for the corresponding time (detected by TLC).
