反应详情

温度

70 °C

To a suspension of 5-amino-3,6-dihydrothiazolo[4,5-d]pyrimidine-2,7-dione (63 mg, 0.34 mmol) in ACN (5 mL) was added BSA (252 μL, 1.02 mmol). The resulting reaction mixture was then stirred at 70° C. under argon for 0.5 hour to form a clear solution. After the solution was cooled to room temperature, [(1S)-1-[(2S,4R,5R)-4,5-diacetoxytetrahydrofuran-2-yl]propyl] 2-methylpropanoate (compound 42b, 105 mg, 0.34 mmol) and TMSOTf (113 μL, 0.51 mmol) were added in sequence. After being heated with stirring at 70° C. for 14 hours, the resulting mixture was concentrated in vacuo to remove the solvent and the residue was purified by column chromatography on silica gel (eluting with 0-5% methanol in DCM) to afford 75 mg of [(1S)-1-[(2S,4R,5R)-4-acetoxy-5-(5-amino-2,7-dioxo-6H-thiazolo[4,5-d]pyrimidin-3-yl)tetrahydrofuran-2-yl]propyl] 2-methylpropanoate (compound 42c) as a light yellow solid.

1. additionwas added BSA (252 μL, 1.02 mmol)
2. customThe resulting reaction mixture
3. customto form a clear solution
4. temperatureAfter the solution was cooled to room temperature
5. temperatureAfter being heated
6. stirringwith stirring at 70° C. for 14 hours
7. concentrationthe resulting mixture was concentrated in vacuo
8. customto remove the solvent
9. customthe residue was purified by column chromatography on silica gel (eluting with 0-5% methanol in DCM)