反应详情

To a solution in 1:3 DMF-dichloromethane (100 mL) of 4-hydroxymethyl-2-phenylbenzoic acid (5.2 g, 23 mmol), prepared as in Example 158D, at 5-10° C. was added 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride (4.8 g, 25 mmol), 3-hydroxy-1,2,3-benzotriazin-4(3H)-one (4.1 g, 25 mmol), methionine methyl ester hydrochloride (5.0 g, 25 mmol) and 4-methylmorpholine (2.8 mL, 25 mmol). The reaction was warmed slowly to ambient temperature and stirred overnight. The reaction mixture was diluted with ethyl acetate and washed with aqueous 1M H3PO4. The organic phase was washed with brine, dried over Na2SO4, filtered, and concentrated in vacuo. Chromatography on silica gel (65% ethyl acetate-hexanes) gave [4-hydroxymethyl-2-phenylbenzoyl]methionine methyl ester (5.15 g, 60%).

1. washwashed with aqueous 1M H3PO4
2. washThe organic phase was washed with brine
3. dry with materialdried over Na2SO4
4. filtrationfiltered
5. concentrationconcentrated in vacuo