Hydrochloric Acid → 2,2-Dimethyl-4-{4'-[(4-methyl-1,3-benzoxazol-2-yl)amino]-1,1'-biphenyl-4-yl}4-oxobutanoic acid

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Reaction Conditions

Reaction Steps

To a solution of methyl 4-(4′-amino-1,1′-biphenyl-4-yl)-2,2-dimethyl-4-oxobutanoate (74 mg, 0.24 mmol) in dichloroethane (3 mL), 4-methyl-2-(methylsulfonyl)-1,3-benzoxazole (50 mg, 0.24 mmol) was added, and the mixture was heated at 85° C. overnight. The solvent was removed by rotary evaporation and the residue was redissolved in DMF (5 mL). A solution of 1 N aqueous NaOH (0.72 mL, 0.72 mmol) was added, and the mixture was heated at 65° C. overnight. A solution of 1 N aqueous HCl (0.24 mL, 0.24 mmol) and methanol (5 mL) was added to the reaction mixture and the crude product was purified by preparative reverse-phase HPLC (water/acetonitrile gradient, containing 0.1% TFA) to afford 2,2-dimethyl-4-{4′-[(4-methyl-1,3-benzoxazol-2-yl)amino]-1,1′-biphenyl-4-yl}-4-oxobutanoic acid as a white solid (32.6 mg, 32.1%). 1H NMR (300 MHz, DMSO-d6) δ 8.00-7.80 (m, 8H), 7.30 (d, 1H), 7.05 (d, 2H), 3.30 (s, 2H), 2.50 (s, 3H), 1.10 (s, 6H); LC-MS ret. time 3.77 min (method 2), m/z 429.2 (MH+).

Provenance & Evidence