反应详情

To a solution of triethoxymethane (5 mL) was added 6-methoxy-N2-((2-(methylthio)benzo[d]thiazol-6-yl)methyl)pyridine-2,3-diamine (332 mg, 1.0 mmol) from Step 6 of this Example at rt. The reaction mixture was heated under reflux overnight. After cooling to rt, the mixture was concentrated under reduced pressure. The crude product was purified on a silica gel column using a mixture of EtOAc-CH2Cl2 (0 to 100%, v/v) as eluent to give 6-((5-methoxy-3H-imidazo[4,5-b]pyridin-3-yl)methyl)-2-(methylthio)benzo[d]thiazole as a brown solid (180 mg, 53%). 1H NMR (300 MHz, CDCl3) δ 7.95 (d, J=8.7 Hz, 1H), 7.87 (s, 1H), 7.82 (d, J=8.5 Hz, 1H), 7.70 (d, J=1.1 Hz, 1H), 7.41 (dd, J=1.7, 8.3 Hz, 1H), 6.71 (d, J=8.7 Hz, 1H), 5.47 (s, 2H), 3.99 (s, 3H), 2.78 (s, 3H). LCMS (ESI) m/z 343 (M+H)+.

1. temperatureThe reaction mixture was heated
2. temperatureunder reflux overnight
3. concentrationthe mixture was concentrated under reduced pressure
4. customThe crude product was purified on a silica gel column
5. additiona mixture of EtOAc-CH2Cl2 (0 to 100%, v/v) as eluent