反应详情

The N-Boc p-hydroxy phenyl glycine methyl ester from step (300a) (123.0 g, 440 mmol) was combined with benzyl bromide (90.3 g, 528 mmol), potassium carbonate (182 g, 1.3 mol) and acetone (800 mL) under a nitrogen atmosphere. The reaction was heated to reflux for 5 h, allowed to cool to rt, diluted with ethyl acetate (800 mL) filtered to remove the solids and concentrated in vacuo to give a semisolid residue. The product was crystallized from ethyl ether to give the N-Boc p-benzyloxy phenyl glycine methyl ester (106.7 g, 65%) as a white powder. MS (M+H)+ =372, (M+NH4)+ =389.

1. temperatureThe reaction was heated
2. temperatureto reflux for 5 h
3. filtrationfiltered
4. customto remove the solids
5. concentrationconcentrated in vacuo
6. customto give a semisolid residue
7. customThe product was crystallized from ethyl ether