反应详情

To a nitrogen degassed solution of 5-butyl-3-iodo-1H-pyrazolo[4,3-d]pyrimidin-7(6H)-one (250 mg, 0.786 mmol) in anhydrous N,N-dimethylformamide (6 mL) under nitrogen atmosphere at room temperature was added copper(I) iodide (30 mg, 0.158 mmol), bis(triphenylphosphine)palladium(II)dichloride (62 mg, 0.088 mmol) and finally triethylamine (0.219 mL, 1.572 mmol). The mixture was stirred at room temperature under nitrogen atmosphere for 10 minutes and then a solution of 5-chloro-1-pentyne (161 mg, 1.572 mmol) in anhydrous N,N-dimethylformamide (1.5 mL) was added. The reaction mixture was stirred at 60° C. for 80 minutes. The reaction was evaporated in-vacuo to yield a brown oil. The oil was partitioned between water/brine (1:1) and ethyl acetate. The organic layer was separated, passed through a hydrophobic frit and evaporated in-vacuo to yield a brown solid. The solid was absorbed onto Florisil, loaded onto a 50 g silica cartridge and purified by chromatography using a 0-100% ethyl acetate in cyclohexane gradient over 60 minutes. Appropriate fractions were combined and evaporated in-vacuo to yield the title compound as a pale yellow solid (172 mg).

1. stirringThe reaction mixture was stirred at 60° C. for 80 minutes
2. customThe reaction was evaporated in-vacuo
3. customto yield a brown oil
4. customThe oil was partitioned between water/brine (1:1) and ethyl acetate
5. customThe organic layer was separated
6. customevaporated in-vacuo
7. customto yield a brown solid
8. customThe solid was absorbed onto Florisil
9. custompurified by chromatography
10. customover 60 minutes
11. customevaporated in-vacuo