Hydrochloric Acid → methyl (2S)-2-amino-3-{4-[(2,6-dichlorobenzoyl)amino]phenyl}propionate hydrochloride

Participants

Reaction Steps

4-[[(2,6-Dichlorophenyl)carbonyl]amino]-N-[(1,1-dimethylethoxy)carbonyl]-L-phenylalanine methyl ester (1.86 g, 4.0 mmol) was treated with 10 mL of 4 N hydrochloric acid in dioxane at room temperature. After 5 minutes, the solid went into solution and the mixture was stirred for 1 hr and 25 mL of ethyl ether was added to precipitate the product. The solids were collected by filtration and were washed with hexane. The resulting hydroscopic and gummy solids were dissolved in 50 mL of methanol and concentrated. After drying under high vacuum, 4-[[(2,6-dichlorophenyl)carbonyl]amino]-L-phenylalanine methyl ester hydrochloride salt (1.64 g, 97%) was obtained as a light yellow solid, mp 158-161° C.

Provenance & Evidence