Methyl chloroacetate → N-tert-butoxycarbonyl-O-methoxycarbonylmethyl-L-tyrosine

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Reaction Steps

A mixture of diphenylmethyl ester of N-tert-butoxycarbonyl-L-tyrosine (5.00 g), methyl chloroacetate (1.45 g) and potassium carbonate (1.85 g) in N,N-dimethylformamide (75 ml) was stirred for 20 hours at room temperature. The mixture was diluted with water (100 ml) and extracted with ethyl acetate. The extract was washed with diluted hydrochloric acid, aqueous sodium bicarbonate, and then brine. After dried over magnesium sulfate, the extract was evaporated to dryness to give diphenylmethyl ester of N-tert-butoxycarbonyl-O-methoxycarbonylmethyl-L-tyrosine (6.40 g), mp. 69°-73° C.

Provenance & Evidence