反应详情

A mixture of N-methoxycarbonyl-L-tyrosine benzyl ester (22.0 g), methyl iodide (10.8 ml), potassium carbonate (24.0 g), and N,N-dimethylformamide (87 ml) was stirred at ambient temperature for 5 hours. The mixture was diluted with dichloromethane (87 ml) and filtered. The filtrate was concentrated in vacuo and the residue was dissolved in ethyl acetate, washed with water and brine, dried over anhydrous magnesium sulfate, and concentrated in vacuo. The crude product was purified by pulverization with petroleum ether to give N-methoxycarbonyl-O-methyl-L-tyrosine benzyl ester (16.0 g).

1. filtrationfiltered
2. concentrationThe filtrate was concentrated in vacuo
3. dissolutionthe residue was dissolved in ethyl acetate
4. washwashed with water and brine
5. dry with materialdried over anhydrous magnesium sulfate
6. concentrationconcentrated in vacuo
7. customThe crude product was purified by pulverization with petroleum ether