2-(Benzo[1,2,5]thiadiazole-4-sulfonylamino)-4,5-dichlorobenzoic acid → (S)-2-[2-(Benzo[1,2,5]thiadiazole-4-sulfonylamino)-4,5-dichloro-benzoylamino]-3-(3-bromo-4-fluoro-phenyl)-propionic acid methyl ester

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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)-4,5-dichloro-benzoic acid as in Example 1, Part C. HPLC: RT=10.74 min. MS (ESI−): mass calcd. for C23H16BrCl2FN4O5S2, 662.34; m/z found, 659/661 [M−H]−. 1H NMR (500 MHz, CDCl3): 11.16 (s, 1H), 8.36 (dd, J=7.1, 0.8, 1H), 8.24 (dd, J=8.8, 0.8, 1H), 7.86 (s, 1H), 7.74 (dd, J=8.8, 7.1, 1H), 7.33 (s, 1H), 7.30-7.27 (m, 1H), 7.06 (t, J=8.3, 1H), 7.03-6.98 (m, 1H), 6.53 (d, J=7.1, 1H), 4.93 (q, J=5.8, 1H), 3.22 (s, 3H), 3.24-3.11 (m, 2H).

Provenance & Evidence