反应详情

The crude acid from Example 12A (180 mg) was dissolved in DMF (1.5 mL) and N′,N′-diethyl-2-methyl-1,4-phenylenediamine monohydrogenchloride (150 mg, 0.7 mmol), Et3N (202 mg, 2.0 mmol), and TBTU (225 mg, 0.7 mmol) were added at ambient temperature. The mixture was stirred overnight and purified by column chromatography to provide the titled compound (120 mg, 25% over 2 steps). 1H NMR (300 MHz, DMSO-D6) δ 8.94 (s, 1H), 7.06 (t, J=7.8 Hz, 2H), 6.83 (d, J=9.0 Hz, 1H), 6.75 (d, J=8.1 Hz, 1H), 6.67 (d, J=7.8 Hz, 1H), 6.43 (m, 2H), 3.78 (s, 3H), 3.67 (s, 3H), 3.29 (q, J=6.9 Hz, 4H), 3.09 (s, 2H), 2.73 (m, 2H), 2.30 (m, 2H), 1.99 (s, 3H), and 1.05 (t, J=6.6 Hz, 6H). MS (ESI) positive ion 425 (M+H)+; negative ion 423 (M−H)−.

1. custompurified by column chromatography