Acetone → Hydrochloric Acid

Participants

Reaction Conditions

Reaction Steps

Et3N (7.0 μL, 50 μmol) was added to a solution of [(2R,4R)-5-(3′-chlorobiphenyl-4-yl)-2-hydroxy-4-[(3-hydroxy-3H-benzotriazole-5-carbonyl)amino]pentanoic acid (20.0 mg, 42 μmol) and (S)-2-t-butoxycarbonylamino-3-methylbutyric acid chloromethyl ester (17.7 mg, 67 μmol) in acetone (1.3 mL, 17.2 mmol), and the resulting mixture was stirred in a sealed vial at 65° C. for 5 hours. 1:1 TFA/DCM (0.50 mL, 3.1 mmol) was added, and the mixture was stirred at room temperature for 30 minutes and concentrated to yield a clear yellow liquid. The crude liquid was purified by preparative HPLC (C18 column chromatography, small column, using 30-90% MeCN in water with 0.05% TFA) to yield the title compound as a white solid HCl salt (6.2 mg, purity 96%). MS m/z [M+H]+ calc'd for C30H32ClN5O7, 610.20. found 610.1.

Provenance & Evidence