Oxalyl chloride → 2-(4-(2-(4-methoxyphenyl)acetamido)-N-(4-((4-octylbenzoyl)oxy)benzyl)benzamido)acetic acid

Participants

Reaction Steps

Prepared using General Procedures 2 then 8: To a stirring solution of 4′-methyl-[1,1′-biphenyl]-4-carboxylic acid (334 mg, 1.57 mmol) in DCM (10 mL) were added DMF (5 drops) and oxalyl chloride (0.14 mL, 1.68 mmol). The reaction mixture was stirred at room temperature for 1 h. To this mixture was added a solution of tert-butyl 2-(N-(4-hydroxybenzyl)-4-(2-(4-methoxyphenyl)acetamido)benzamido)acetate INT-9 (750 mg, 1.31 mmol) and TEA (0.37 mL, 2.62 mmol) in DCM (10 mL). The reaction mixture was stirred at room temperature for 1 h then DMAP (30 mg, 0.33 mmol) was added. After a further 2 h at room temperature, the reaction was diluted with DCM (50 mL) and washed with NaHCO3 (50 mL). The organics were pre-absorbed onto silica gel and purified by chromatography (EA/isohexanes). The isolated material was taken up into DCM (10 mL) and TFA (5 mL) was added. After 2 h the solvent was removed under vacuum and solid was evaporated from diethyl ether (5 mL) and isohexanes (20 mL) to give a fine powdery solid. Trituration from DCM/isohexanes and isolation by filtration gave a fine powder that was slurried in water (20 mL) and isolated by filtration. The solid was washed with DCM and isohexanes (9:1, 50 mL) followed by isohexanes (50 mL) to afford 15.3 mg (19%) of 2-(4-(2-(4-methoxyphenyl)acetamido)-N-(4-((4-octylbenzoyl)oxy)benzyl)benzamido)acetic acid 192. LCMS-ESI (m/z) calculated for C40H33F3N2O7: 710; found 711 [M+H]+, tR=8.81 min (Method 9). 1H NMR (400 MHz, DMSO) δ 12.96-12.60 (br s, 1H), 10.36 (s, 1H), 8.25-8.16 (m, 2H), 7.94-7.84 (m, 2H), 7.75-7.62 (m, 4H), 7.55-7.27 (m, 9H), 7.25-7.15 (m, 2H), 4.70 (s, 1H), 4.61 (s, 1H), 4.03 (s, 1H), 3.95 (s, 1H), 3.8-3.78 (m, 5H), 2.37 (s, 3H).

Provenance & Evidence