反应详情

To a suspension of 3-[4-(4-chlorobenzyl)-5-(4H-1,2,4-triazol-3-yl)-1,3-thiazol-2-yl]-2-methylpyrazolo[1,5-a]pyridine-5-carbaldehyde (0.300 g, 0.690 mmol) in acetic acid (0.20 mL, 3.5 mmol) and dry methylene chloride (10 mL, 200 mmol) was added 2,4-dimethoxybenzylamine (0.207 mL, 1.38 mmol), followed by additional of sodium triacetoxyborohydride (0.363 g, 1.71 mmol). The mixture was stirred at rt. for 16 hours. The mixture was basified with NaHCO3 solution to =pH 8 then extracted with DCM. The DCM solution was washed with water. The crude product was purified by column chromatography (SiO2, elution with 0-100% MeOH in DCM) to afford a solid product (0.252 g, yield 62%). LCMS: (FA) ES+ 586, 588; ES− 584, 586. 1H NMR (400 MHz, CDCl3 and d4-methanol) δ: 8.23-8.25 (d, J=7.03 Hz, 1H), 8.18 (s, 1H), 8.01 (s, 1H), 7.28-7.30 (d, J=8.53 Hz, 2H), 7.09-7.11 (d, J=8.53 Hz, 2H), 7.01-7.03 (d, J=8.28 Hz, 1H), 6.78-6.80 (d, J=7.03 Hz, 1H), 6.33-6.37 (m, 2H), 4.53 (s, 2H), 3.65 (s, 2H), 3.64 (s, 6H), 3.61 (s, 2H), 2.61 (s, 3H).

1. extractionthen extracted with DCM
2. washThe DCM solution was washed with water
3. customThe crude product was purified by column chromatography (SiO2, elution with 0-100% MeOH in DCM)