反应详情

Add potassium carbonate (17.72 mmol, 2.45 g, 2.40 equivalents), potassium iodide (0.73 mmol, 123 mg, 0.10 equivalents), and 4-bromobutyronitrile (8.86 mmol, 0.88 mL, 1.20 equivalents) to a stirred solution of 6-methyl-3-piperidin-4-yl-thieno[2,3-d]isoxazole hydrochloride (7.38 mmol, 1.91 g, 1.00 equivalents) in acetonitrile (10.84 mL) and water (3.60 mL). Stir the resulting mixture at reflux overnight. Cool to room temperature, filter the reaction mixture and wash the solid material collected with dichloromethane and evaporate the filtrate. Take the residue up in dichloromethane (45 mL), wash with sodium hydroxide (aqueous, 18 mL, 2 M), water (18 mL), saturated sodium hydroxide (aqueous, 18 mL), dry over magnesium sulfate, filter and evaporate. Purify the residue via flash column chromatography using a gradient and eluting with a mixture of n-heptane : ethyl acetate (0.5:9.5) to ethyl acetate (100%) to yield the desired product as a brown oil (663 mg). LC/MS (ESI), m/e 290 (MH+), retention time 1.19 minutes. Condition II.

1. temperatureat reflux overnight
2. filtrationfilter the reaction mixture
3. washwash the solid material
4. customcollected with dichloromethane
5. customevaporate the filtrate
6. washwash with sodium hydroxide (aqueous, 18 mL, 2 M), water (18 mL), saturated sodium hydroxide (aqueous, 18 mL)
7. dry with materialdry over magnesium sulfate
8. filtrationfilter
9. customevaporate
10. customPurify the residue via flash column chromatography
11. washeluting with a mixture of n-heptane : ethyl acetate (0.5:9.5) to ethyl acetate (100%)