反应详情

温度

0 °C

To a 150 mL round-bottom flask was added p-toluenesulfonylmethyl isocyanide (1.46 g, 7.5 mmol) and MeOH, followed by sodium methoxide (4.60 mL, 21.2 mmol) and a MeOH solution of 3-methyl-1H-indazole-5-carbaldehyde (1.00 g, 6.24 mmol) (prepared as described in WO 2007/124288). The solution was stirred at reflux for about 1 hour and followed by LCMS. Water was added (50 mL) and the MeOH was removed in vacuo. The suspension was cooled to 0° C. and the resulting precipitate was filtered and dried in the vacuum oven overnight to give 3-methyl-5-(oxazol-5-yl)-1H-indazole (1.01 g, 81% yield) as a tan powder. LCMS (API-ES) m/z (%): 200 (100%, M++H).

1. temperatureat reflux for about 1 hour
2. customthe MeOH was removed in vacuo
3. filtrationthe resulting precipitate was filtered
4. customdried in the vacuum oven overnight