反应详情

Dissolve 7-(1-propyl-butyl)-2,5-dimethyl-pyrazolo[1,5-a]pyrimidine (3.08 g, 12.5 mmol) in anhydrous acetonitrile (25 mL) and add 6 portions (0.70 g each) of N-iodosuccinimide (4.2 g, 18.7 mmol) at 10 minute intervals. Stir over the weekend at room temperature. Strip off the acetonitrile and dilute the oil with dichloromethane (100 mL). Wash with saturated ammonium chloride solution (2×50 mL). Collect the organic phase, dry over anhydrous magnesium sulfate, filter, and concentrate under reduced pressure to yield a dark red oil. Purify the oil using flash chromatography, eluting with 100% hexane/0% (20% ethyl acetate/hexane) to 0% hexane/100% (20% ethyl acetate/hexane) in a step gradient of 50% increments to give an orange oil (10.97 g, 87%).

1. washWash with saturated ammonium chloride solution (2×50 mL)
2. customCollect the organic phase
3. dry with materialdry over anhydrous magnesium sulfate
4. filtrationfilter
5. concentrationconcentrate under reduced pressure
6. customto yield a dark red oil
7. customPurify the oil
8. washeluting with 100% hexane/0% (20% ethyl acetate/hexane) to 0% hexane/100% (20% ethyl acetate/hexane) in a step gradient of 50% increments