2,5-Dimethoxyphenylacetic acid → tert-butyl 2-(4-(2-(2,5-dimethoxyphenyl)acetamido)-N-(4-(3-(4'-methyl-[1,1'-biphenyl]-4-yl)-1,2,4-oxadiazol-5-yl)benzyl)benzamido)acetate

Participants

Reaction Steps

Prepared using General Procedure 6. To a suspension of tert-butyl 2-(4-amino-N-(4-(3-(4′-methyl-[1,1′-biphenyl]-4-yl)-1,2,4-oxadiazol-5-yl)benzyl)benzamido)acetate INT-64 (60 mg, 0.104 mmol) and 2-(2,5-dimethoxyphenyl)acetic acid (20.48 mg, 0.104 mmol) stirring in DMF (2 mL) were added HATU (43.7 mg, 0.115 mmol) and TEA (36.4 μL, 0.261 mmol). After stirring at room temperature for 2 h the reaction mixture was diluted with EA (25 mL) and washed with NaHCO3 (2×25 mL), 1 M HCl (2×25 mL) and brine (25 mL). The organics were dried over MgSO4 and concentrated in vacuo. The crude product was purified by chromatography (EA/hexanes) to afford 56 mg (71%) of tert-butyl 2-(4-(2-(2,5-dimethoxyphenyl)acetamido)-N-(4-(3-(4′-methyl-[1,1′-biphenyl]-4-yl)-1,2,4-oxadiazol-5-yl)benzyl)benzamido)acetate INT-65. LCMS-ESI (m/z) calculated for C45H44N4O7: 752; found 753 [M+H]+, tR=2.76 min (Method 10).

Provenance & Evidence