反应详情

To a solution of 1.8 g (6.23 mmol) of 4-(2′,6′-dimethoxyphenyl)-2-nitrobenzyl alcohol and 2.3 g (8.72 mmol) of Ph3P in CH2Cl2 (20 mL) at 0° C. was added 1.32 g (7.5 mmol) of NBS. The reaction mixture was stirred at 0° C. for 30 min at which time TLC analysis (eluted with 25% Et2O in hexanes) indicated that the starting material had been consumed. The reaction mixture was concentrated and the crude residue was purified by flash column chromatography on silica gel eluted with 50% Et2O in hexanes to give 4-(2′,6′-dimethoxyphenyl)-2-nitrobenzyl bromide as a pale yellow solid. Trituration with hexanes gave the product as a white solid.

1. customhad been consumed
2. concentrationThe reaction mixture was concentrated
3. customthe crude residue was purified by flash column chromatography on silica gel
4. washeluted with 50% Et2O in hexanes