1: K2CO3 / methanol / 4.5 h / Ambient temperature 2: NaH / dimethylformamide / 8 h / Ambient temperature 3: NBS / acetonitrile; H2O / Ambient temperature View Scheme

1: K2CO3 / methanol / 4.5 h / Ambient temperature 2: NaH / dimethylformamide / 8 h / Ambient temperature 3: NBS / acetonitrile; H2O / Ambient temperature View Scheme

1: K2CO3 / methanol / 4.5 h 2: NaH / dimethylformamide / Ambient temperature View Scheme