反应详情

5-Ethoxycarbonyl-2-methylpyrimid-4-one (3.5 g, 19 mmol) was dissolved in DME (110 mL) and TBAF (28.5 mL, 1 M solution in THF, 28.5 mmol) added dropwise at 0° C. The resulting solution was stirred ten minutes and a solution of 3-bromoacetyl-2,5-dimethylfuran (4.3 g, 20 mmol) in DME (10 mL) was added dropwise. The reaction was stirred at room temperature overnight. The solution was then concentrated in vacuo and partitioned between EtOAc and saturated aqueous NH4Cl. The EtOAc layer was separated and concentrated. The product was purified using flash silica chromatography (EtOAc/hexane=2:8 to 8:2), with the o-alkylated side product eluting at 4:6, and the desired N-alkylated product eluting at 8:2. The N-alkylated product was dried as a yellow solid, isolated in 31% yield; MS: 319 (M+H) and 273.

1. stirringThe reaction was stirred at room temperature overnight
2. concentrationThe solution was then concentrated in vacuo
3. custompartitioned between EtOAc and saturated aqueous NH4Cl
4. customThe EtOAc layer was separated
5. concentrationconcentrated
6. customThe product was purified
7. washwith the o-alkylated side product eluting at 4:6
8. washthe desired N-alkylated product eluting at 8:2
9. customThe N-alkylated product was dried as a yellow solid
10. customisolated in 31% yield