1: 2percent aq. NaOH 2: CsF / dimethylformamide 3: H2 / Pd/C / tetrahydrofuran 4: 1.) (COCl)2 6: 96 percent / tris(2-methylphenyl)phosphine, Pd(OAc)2, Ag2CO3 / dimethylformamide / 3 h / Heating View Scheme

sodium hydroxide in water 1.5 h; Heating;