反应详情

A solution of (2-bromo-5-methoxy-3-methyl-phenyl)-methanol ((Example 192: step c) 0.800 g, 3.46 mmol) in DMF (10 mL) was cooled to 0° C. and treated with NaH (0.100 g of 95% dispersion, 4.15 mmol) and allowed to warm to room temperature 30 min. The mixture was then treated with tert-butyl bromoacetate (0.614 mL, 4.15 mmol) and stirred at room temperature 1 h. The reaction was diluted with water and extracted with EtOAc (2×125 mL). The combined organic layers were washed well with water (3×300 mL), dried over MgSO4, and concentrated in vacuo to afford the product (2-bromo-5-methoxy-3-methyl-benzyloxy)-acetic acid tert-butyl ester (1.19 g, 98%) as a yellow oil. 1H NMR (CDCl3): δ 6.967 (d, 1H, J=2.8 Hz), 6.745 (d, 1H, J=3.2 Hz), 4.683 (s, 2H), 4.086 (s, 2H), 3.794 (s, 3H), 2.380 (s, 3H), 1.496 (s, 9H).

1. extractionextracted with EtOAc (2×125 mL)
2. washThe combined organic layers were washed well with water (3×300 mL)
3. dry with materialdried over MgSO4
4. concentrationconcentrated in vacuo