反应详情

Magnesium perchlorate (0.46 g, 2.08 mmol) was added to an acetonitrile (18 mL) solution containing the intermediate from Step A (1.04 g, 6.30 mmol). After stirring for 5 minutes N-bromosuccinimide (1.35 g, 7.55 mmol) was added and the reaction solution was stirred overnight. The solution was then partitioned between EtOAc and 1N NaHCO3 aq. The organic layer was washed with brine, dried over MgSO4, filtered and concentrated. The residue was purified by silica gel chromatography using a hexanes/EtOAc gradient to give the indicated product. 1H NMR (400 MHz, CH3CN-d3): δ 8.48 (d, J=4.8 Hz, 1H); 7.85-736 (m, 2H); 7.32-7.26 (m, 1H); 3.72 (s, 3H); 2.24 (s, 3H). m/z=244.4 (M+H).

1. additionwas added
2. customThe solution was then partitioned between EtOAc and 1N NaHCO3 aq. The organic layer
3. washwas washed with brine
4. dry with materialdried over MgSO4
5. filtrationfiltered
6. concentrationconcentrated
7. customThe residue was purified by silica gel chromatography
8. customto give the indicated product