1: With lithium hexamethyldisilazane in tetrahydrofuran T=-78°C; 0.75 h; Inert atmosphere; 2: With trifluoromethylsulfonic anhydride in tetrahydrofuran T=-78 - 20°C; Inert atmosphere; 3: With ammonium chloride in tetrahydrofuran; water T=20°C;
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