Cesium carbonate → 5-(3-{[tert-butyl(dimethyl)silyl]oxy}propyl)-4-chloro-5H-pyrrolo[3,2-d]pyrimidine

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Reaction Steps

To a suspension of 4-chloro-5H-pyrrolo[3,2-d]pyrimidine (400 mg) in N,N-dimethylformamide (2.6 mL) was added cesium carbonate (957 mg) under ice-cooling, and the mixture was stirred while warming to room temperature for 15 min. To the reaction mixture was added (3-bromopropoxy)(tert-butyl)dimethylsilane (979 mg), and the mixture was stirred at room temperature for 16 hrs. The reaction mixture was diluted with water (20 mL) and extracted with ethyl acetate (30 mL×3). The organic layer was washed with saturated brine (30 mL×3) and dried over anhydrous magnesium sulfate. The solvent was evaporated under reduced pressure, and the obtained residue was subjected to silica gel column chromatography (silica gel, eluent:hexane/ethyl acetate=85/15→10/90). The object fraction was concentrated under reduced pressure and dried to give the title compound (630 mg) as a white solid.

Provenance & Evidence