1: 81 percent / 1,8-diazabicyclo<5.4.0>undec-7-ene (DBU), N-bromosuccinimide (NBS) / dimethylformamide / 0.75 h / Ambient temperature 2: 97 percent / NaOMe / methanol / 0.25 h / Ambient temperature 3: 8 percent / 4-methoxyphenol / tetrahydrofuran / 5 h / Ambient temperature; Irradiation View Scheme

1: 81 percent / 1,8-diazabicyclo<5.4.0>undec-7-ene (DBU), N-bromosuccinimide (NBS) / dimethylformamide / 0.75 h / Ambient temperature 2: 97 percent / NaOMe / methanol / 0.25 h / Ambient temperature 3: 8 percent / 4-methoxyphenol / tetrahydrofuran / 5 h / Ambient temperature; Irradiation View Scheme

1: 81 percent / 1,8-diazabicyclo<5.4.0>undec-7-ene (DBU), N-bromosuccinimide (NBS) / dimethylformamide / 0.75 h / Ambient temperature 2: NaH / tetrahydrofuran / 3.5 h / Ambient temperature; Irradiation View Scheme