4-Methylbenzoyl Chloride → 2-(4-(2-(4-methoxy-2-(trifluoromethyl)phenyl)acetamido)-N-(4-(5-(p-tolyl)-1,2,4-oxadiazol-3-yl)benzyl)benzamido)acetic acid

Participants

Reaction Steps

Prepared using General Procedures 20 and 8: To a stirring solution of tert-butyl 2-(N-(4-(N-hydroxycarbamimidoyl)benzyl)-4-(2-(4-methoxy-2-(trifluoromethyl)phenyl)acetamido)benzamido)acetate INT-33 (128 mg, 0.21 mmol) and DIEA (0.058 mL, 0.31 mmol) in dioxane (4 mL) was added a solution of 4-methylbenzoyl chloride (0.028 mL, 0.21 mmol) in dioxane (1 mL). After stirring at room temperature for 1 h, the reaction mixture was heated to 120° C. for 2 h. The reaction mixture was allowed to cool to room temperature, diluted with DCM (4 mL), shaken with NaHCO3 (10 mL), split through a hydrophobic frit and evaporated. The crude material was purified by column chromatography (EA/isohexanes). The isolated material was dissolved in DCM (2 mL) and TFA (2 mL) was added. The reaction mixture was stirred at room temperature for 2 h then evaporated and re-slurried from acetonitrile (6 mL) to afford 77 mg (56%) of 2-(4-(2-(4-methoxy-2-(trifluoromethyl)phenyl)acetamido)-N-(4-(5-(p-tolyl)-1,2,4-oxadiazol-3-yl)benzyl)benzamido)acetic acid 355 as a white solid. LCMS-ESI (m/z) calculated for C35H29F3N4O6: 658; found 659 [M+H]+, tR=7.97 min (Method 9). 1H NMR (400 MHz, DMSO) δ 12.81 (s, 1H), 10.34 (s, 1H), 8.10 (d, J=6.1 Hz, 2H), 8.09-8.05 (m, 2H), 7.70-7.56 (m, 3H), 7.53-7.41 (m, 4H), 7.38 (d, J=8.0 Hz, 2H), 7.26-7.14 (m, 2H), 4.76 (s, 1H), 4.68 (s, 1H), 4.04 (s, 1H), 3.97 (s, 1H), 3.91-3.79 (m, 5H), 2.45 (s, 3H).

Provenance & Evidence