反应详情

To a mixture of Tyrosine ethyl ester (40 g) and Triethylamine (40 ml) in Ethyl acetate (600 ml) at 0° C. temperature was added Chloro carbonyl methoxy-acetic acid benzyl ester (46.5 g) drop wise. The reaction mixture was further stirred at room temperature for 10 hours. The solids were filtered off and the organic phase was washed with 5% sodium bicarbonate solution (600 ml) and water (600 ml). It was dried over sodium sulphate and organic solvent was distilled. The crude was purified by column chromatography on silica gel using Hexane:Ethyl acetate (8:2) to get pure 2-(2-Benzyloxy carbonyl methoxy-acetyl amino)-3-(4-hydroxy-phenyl)-propionic acid ethyl ester (30 g) as a light yellow syrup. The product was characterized by 1H NMR (CDCl3) δ 1.20 (t, 3H, CH3), 2.90 to 3.10 (m, 2H, CH2), 4.10 to 4.30 (m, 6H, 3X CH2), 4.85 (q, 1H, CH), 5.20 (s, 2H, CH2), 5.80 (bs, 1H, NH), 6.70 (d, 2H, Ar), 7.00 (d, 2H, Ar), 7.40 (m, 5H, Ar).

1. filtrationThe solids were filtered off
2. washthe organic phase was washed with 5% sodium bicarbonate solution (600 ml) and water (600 ml)
3. dry with materialIt was dried over sodium sulphate and organic solvent
4. distillationwas distilled
5. customThe crude was purified by column chromatography on silica gel