pyridine in dichloro difluoro methane T=20°C; 18 h;

1: Methyltriphenylphosphonium bromide With potassium hexamethylsilazane in tetrahydrofuran; tolulene T=20°C; 3 h; 2: benzyl 3,5-difluoro-4-formylphenylcarbamate in tetrahydrofuran; tolulene T=20°C; 16 h;