反应详情

To a solution of 2-(1-acetyloxyethyl)-9-[2-chloro-4-ethoxycarbonylmethoxy-5-(2,3-difluoro-6-methoxybenzyloxy)phenyl]-6-methoxy-7,9-dihydro-8H-purin-8-one (0.33 g), which was prepared in a similar manner to that described in Example 171 using 2-(1-acetyloxyethyl)-4-chloro-6-methoxy-5-nitropyrimidine and ethyl 2-[4-amino-5-chloro-2-(2,3-difluoro-6-methoxybenzyloxy)phenoxy]acetate instead of 4-chloro-6-methoxy-2-methoxymethyl-5-nitropyrimidine and ethyl 2-[4-amino-5-chloro-2-(2-fluoro-6-methoxy-benzyloxy)phenoxy]acetate, respectively, in ethanol (2 mL)-tetrahydrofuran (3 mL) was added sodium ethoxide (20% ethanol solution, 0.5 mL), and the mixture was stirred at room temperature for 3 hours. The reaction mixture was poured into 1 mol/L hydrochloric acid, and the resulting mixture was extracted with ethyl acetate. The extract was washed with water and brine, and dried over anhydrous sodium sulfate. The solvent was removed under reduced pressure, and the residue was purified by column chromatography on silica gel (eluent: n-hexane/ethyl acetate=1/1−1/9) to give the title compound (0.17 g)

1. extractionthe resulting mixture was extracted with ethyl acetate
2. washThe extract was washed with water and brine
3. dry with materialdried over anhydrous sodium sulfate
4. customThe solvent was removed under reduced pressure
5. customthe residue was purified by column chromatography on silica gel (eluent: n-hexane/ethyl acetate=1/1−1/9)