反应详情

温度

90 °C

A mixture of 4-[4-[(6-chloroimidazo[1,2-a]pyridin-2-yl)methyl]-1-piperazinyl]-3-fluorobenzonitrile (Example 38; 0.298 g), pulverized NaOH (0.159 g), tert-butanol (3 mL), and 5 drops of 30% hydrogen peroxide in water is heated at 90° C. for 5.5 h. The mixture is then concentrated under reduced pressure and the resulting solids are slurried in water, collected by filtration, and washed and dried under reduced pressure. The solids are then crystallized from dichloromethane/methanol to give 0.180 g of material, which is chromatographed on silica gel using methanol/dichloromethane (4/96). After combining and concentrating the appropriate fractions, the residue is crystallized from ethyl acetate/dichloromethane/methanol to give 0.084 g of the title compound; mp 253-255° C.; MS m/z 387, 389; IR (mineral oil) 1435, 1620, 1678, 1225, 1505 cm-1 ; 1H NMR (CDCl3 +CD3OD) δ2.77, 3.38, 3.80, 6.94, 7.19, 7.53, 7.62, 8.23.

1. concentrationThe mixture is then concentrated under reduced pressure
2. filtrationcollected by filtration
3. washwashed
4. customdried under reduced pressure
5. customThe solids are then crystallized from dichloromethane/methanol