Trifluoroacetic acid → HCID 11540489, compound

Participants

Reaction Steps

A solution of 3(R,S)-[2(S)-(3-benzoylamino-2-oxo-2H-pyridin-1-yl)-3-phenyl-propionylamino]-5-fluoro-4-oxo-pentanoic acid tert-butyl ester (776 mg, 1.41 mmol) in dichloromethane (6 mL) was cooled to 0° C. Trifluoroacetic acid (2 ml) was added and the resulting mixture allowed to warm to room temperature and stir for 3 hours. The mixture was then concentrated under reduced pressure and the residue redissolved in dichloromethane. This process was repeated several times in order to remove excess trifluoroacetic acid. The solid was then dried to constant weight under vacuum. This gave the title product as a pink solid (627 mg, 90%); 1H NMR (400 MHz, d6-DMSO) δ 2.59-2.95 (2H, m), 3.34-3.47 (2H, m), 4.30-4.81 (2H, m), 5.15-5.33 (2H, m), 5.87-6.09 (1H, m), 6.38 (1H, t), 7.15-7.32 (5H, m), 7.60-7.78 (4H, m), 7.92 (2H, d), 8.17-8.21 (1H, m), 9.01-9.11 (1H, m), 9.28 (1H, m), 12.51 (1H, br s); 19F NMR (376 MHz, d6-DMSO, proton-decoupled) δ−226.8, 232.6; M+H 494.4, M−H 492.4.

Provenance & Evidence