Lithium hydroxide, monohydrate → 4-amino-N-[[1-[(4-methoxyphenyl)methyl]cyclopentyl]carbonyl]-L-phenylalanine

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Reaction Steps

4-Amino-N-[[1[(4-methoxyphenyl)methyl]cyclopentyl]carbonyl]-L-phenylalanine methyl ester (280 mg, 0.68 mmol) in THF (12 mL) was treated with a solution of lithium hydroxide hydrate (100 mg, 2.4 mmol) in water (2 mL) and the mixture was stirred for 3 hr. The mixture was concentrated and the residue was acidified with 6 H HCl to give a white sticky solid. Trituration with water and drying under high vacuum afforded crude 4-amino-N-[[1-[(4-methoxyphenyl)methyl]cyclopentyl]carbonyl]-L-phenylalanine (200 mg) suitable for use in the next step.

Provenance & Evidence