Acetyl chloride → 3-amino-N-[2,6-dichloro-4-[[[(3-hydroxyphenyi)methyl]amino]carbonyl]benzoyl]-L-alanine, methyl ester hydrochloride

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Reaction Steps

A solution of acidic methanol was prepared by adding acetyl chloride (25 mL, 351.6 mmol) to cooled (˜0° C.) methanol (200 mL) and stirring for 10 min. This solution was added to N-[2,6-dichloro-4-[[[(3-hydroxyphenyl)methyl]amino]carbonyl]benzoyl]-3-[[(1,1-dimethylethoxy) carbonyl]amino]-L-alanine, methyl ester (8.64 g, 16.0 mmol) and the resulting solution was stirred at room temperature for 16 h. The solvent was evaporated to give 3-amino-N-[2,6-dichloro-4-[[[(3-hydroxyphenyi)methyl]amino]carbonyl]benzoyl]-L-alanine, methyl ester hydrochloride (7.40 g, 97%) as a cream-colored foam.

Provenance & Evidence