反应详情

To a solution of 2-(2-bromophenoxy)-5-nitropyrimidine (5.30 g, 17.9 mmol) in DMF (35.8 ml, 17.9 mmol) was added tin (II) chloride (17.0 g, 89.5 mmol) and water (4.48 ml, 17.9 mmol). The reaction was sonicated for 15 min and became deep red and exothermic in nature. The reaction was stirred at RT. After 4 h, the reaction was diluted with EtOAc, cooled to 0° C. and neutralized with 10% NaOH. Tin residue precipitated out of the solution. The reaction was diluted with EtOAc. The suspension was allowed to settle. The organic layer was decanted and passed through a fritted funnel. This procedure was repeated two more times to extract product into the organic layer. The organic layer, containing the product, was washed with brine, dried over MgSO4, filtered, and concentrated. The product was purified by column chromatography on silica gel using 90:10 DCM:(90:10:1 DCM:MeOH:NH4OH). Upon concentration of the product fractions, the resulting brown solid was dissolved/suspended in DCM, washed with water to remove the DMF, washed with brine, dried over MgSO4, filtered, and concentrated. Yellow solid, 2-(2-bromophenoxy)pyrimidin-5-amine was obtained. MS Calc'd for C10H8BrN3O: [M]+=265. Found: [M+H]+=266, [M+2H]+=267.

1. customThe reaction was sonicated for 15 min
2. customTin residue precipitated out of the solution
3. additionThe reaction was diluted with EtOAc
4. customThe organic layer was decanted
5. custompassed through a fritted funnel
6. extractionto extract product into the organic layer
7. additionThe organic layer, containing the product
8. washwas washed with brine
9. dry with materialdried over MgSO4
10. filtrationfiltered
11. concentrationconcentrated
12. customThe product was purified by column chromatography on silica gel using 90:10 DCM
13. washwashed with water
14. customto remove the DMF
15. washwashed with brine
16. dry with materialdried over MgSO4
17. filtrationfiltered
18. concentrationconcentrated