Sodium Carbonate → N-benzyloxycarbonylphenylalanine methyl ester

Participants

Reaction Steps

20.0 g (92.73 mmol) of (L)-phenylalanine methyl ester hydrochloride was suspended in 93 ml of toluene, and 15.82 g (92.73 mmols) of benzyl chloroformate was added thereto. 130 ml of an aqueous solution of 1 M sodium carbonate was dropwise added thereto, while keeping it at 7° C. or lower, and stirred for 3 hours. After this was subjected to phase separation, the resulting organic layer was washed with 60 ml of 0.1 N hydrochloric acid and 60 ml of a saturated aqueous solution of sodium hydrogen carbonate, and then dried with anhydrous sodium sulfate. This was filtered and concentrated to obtain 28.75 g (96.8 wt. %, 88.81 mmol) of the above-entitled compound. The yield was 95.8%.

Provenance & Evidence