4-Amino-2,3,5,6-tetrafluorobenzoic acid → 1-[2-(4-Amino-2,3,5,6-tetrafluoro-benzoylamino)-propionyl]-pyrrolidine-2-carboxylic acid (2-benzyloxy-5-oxo-tetrahydro-furan-3-yl)-amide

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Reaction Steps

Prepared from {2-[2-(2-benzyloxy-5-oxo-tetrahydro-furan-3-ylcarbmoyl)-pyrrolidin-1-yl]-1-methyl-2-oxo-ethyl}-carbamic acid tert-butyl ester and 4-amino-2,3,5,6-tetrafluoro-benzoic acid according to the procedure used to prepare 98a to afford 58 mg of title compound (73% yield). 1H-NMR (500 MHz, 1:1 CDCl3:CD3OD) δ 1.30-1.50 (m, 3H), 1.62-2.35 (m, 4H), 2.45-3.12 (m, 2H), 3.50-3.90 (m, 2H), 4.20-4.95 (m, 5H), 5.42 (s, 0.4H), 5.52 (s, 0.1H), 5.64 (d, 0.4H), 5.82 (d, 0.1H), 7.25-7.65 (m, 5H). Analytical HPLC: 16.56, 16.90 min. LC-MS (ES+): m/e=567.2 (M+H+).

Provenance & Evidence