Pyridine → (S)-3-[(S)-2-(4-Acetoxy-phenyl)-2,3-dihydro-benzo[1,4]dioxin-6-yl]-2-tert-butoxycarbonylamino-propionic acid methyl ester

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Reaction Steps

To a solution of (S)-2-tert-Butoxycarbonylamino-3-[(S)-2-(4-hydroxy-phenyl)-2,3-dihydro-benzo[1,4]dioxin-6-yl]-propionic acid methyl ester (240 mg) in DCM (10 mL) was added pyridine at 0° C. To this mixture was added acetic anhydride. The mixture was stirred for 2-3 h. After completion of the reaction, the mixture was diluted with DCM (50 mL) and was washed with water, 1N HCl and brine solution. The organic layer was dried and concentrated to get the desired product as a white solid (208 mg). LCMS (m/z): 473

Provenance & Evidence