1H-imidazole in N,N-dimethyl-formamide T=20°C;

1: tert-butyl(5-ethyl-2-fluorophenoxy)dimethylsilane With N,N,N',N,-tetramethylethylenediamine; sec.-butyllithium in tetrahydrofuran; cyclohexane T=-75°C; 2 h; 2: N,N-dimethyl-formamide in tetrahydrofuran; cyclohexane T=-75°C; 1 h; 3: With water; ammonium chloride in tetrahydrofuran; diethyl ether; cyclohexane T=20°C;