2-(Benzo[1,2,5]thiadiazole-4-sulfonylamino)-4-chlorobenzoic acid → (S)-2-[2-(Benzo[1,2,5]thiadiazole-4-sulfonylamino)-4-chloro-benzoylamino]-3-(3-bromo-4-fluoro-phenyl)-propionic acid

Participants

Reaction Steps

The title compound was prepared from 3-bromo-4-fluoro-L-phenylalanine methyl ester hydrochloride and 2-(benzo[1,2,5]thiadiazole-4-sulfonylamino)-4-chloro-benzoic acid as in EXAMPLE 1, Part C, followed by hydrolysis of the resulting methyl ester as in EXAMPLE 2, Part E. HPLC: RT=9.72 min. MS (ESI−): mass calcd. for C22H15BrClFN4O5S2, 613.87; m/z found, 611/613 [M−H]−. 1H NMR (400 MHz, CDCl3): 11.36 (s, 1H), 8.34 (d, J=6.9, 1H), 8.16(d, J=8.7, 1H), 7.74-7.67 (m, 1H), 7.66-7.63 (m, 1H), 7.38-7.32 (m, 1H), 7.20-7.15 (m, 1H), 7.12-7.05 (m, 1H), 7.05-6.98 (m, 1H), 6.91-6.84 (m, 1H), 6.68 (d, J=6.7, 1H), 6.09 (s, 2H), 5.04-4.94 (m, 1H), 3.35-3.15 (m, 2H).

Provenance & Evidence