Dimethylformamide → 4-Methyl-3-[({4-[(4-phenylquinazolin-2-yl)amino]phenyl}carbonyl)amino]benzoic acid

Participants

Reaction Conditions

Reaction Steps

To a stirred solution of 4-(4-phenylquinazolin-2-ylamino)benzoic acid (1.02 g, 2.99 mmol), prepared as described in Example 10, methyl-amino-4-methylbenzooate (496 mg, 3.01 mmol), and Hunig's base (1.57 mL, 9.01 mmol) in dimethylformamide (15 mL) was added HATU (1.14 g, 3.00 mmol). The stirred mixture was heated to 60° C. overnight, then cooled to rt. The reaction was diluted with dichloromethane and washed with 2 N aqueous sodium hydroxide. The organic layer was then dried over sodium sulfate and concentrated on a rotary evaporator. The residue was sonicated with acetonitrile and filtered to give a light yellow solid that was suspended in a mixture of methanol (22 mL) and tetrahydrofuran (11 mL). A 1 N aqueous solution of sodium hydroxide (11 mL) was added and the stirred mixture was heated to 70° C. for 3 h. The reaction mixture was cooled to rt, concentrated on a rotary evaporator and redissolved in water, which was then made acidic with 1 N aqueous hydrochloric acid until the pH of the solution reached 5. The precipitate that formed was collected and dried in vacuo to afford 4-methyl-3-[({4-[(4-phenylquinazolin-2-yl)amino]phenyl}carbonyl)amino]benzoic acid (1.23 g, 86%) as a yellow solid. 1H NMR (400 MHz, DMSO-d6): δ 10.34 (s, 1H), 9.82 (s, 1H), 8.18 (d, 2H), 8.00 (d, 2H), 7.95 (s, 1H), 7.90-7.78 (m, 5H), 7.72 (dd, 1H), 7.66-7.64 (m, 3H), 7.42 (ddd, 1H), 7.36 (d, 1H), 2.31 (s, 3H). MS (EI) for C29H22N4O3: 475.3 (MH+).

Provenance & Evidence