反应详情

To a stirred solution mixture of 5-benzyloxy-6-hydroxy-2-(1-phenyl-cyclopentylmethyl)-pyrimidine-4-carboxylic acid (283) (250 mg, 0.62 mmol) and [2-(tert-butyl-dimethylsilanyloxy)-ethyl]-(4-fluoro-benzyl)-amine (8k) (210 mg, 0.74 mmol) in dimethylformamide (5 mL) was added propylphosphonic anhydride (50 wt % in ethyl acetate) (1.3 g, 1.85 mmol) at 0° C. After stirring at room temperature for 20 h, water (20 mL) was added and the mixture was extracted with ethyl acetate (3×20 mL). The combined organic part was washed with water (3×50 mL) and brine (2×30 mL) and dried and concentrated. The crude product was purified by Combi-Flash column (eluted at 20-30% ethyl acetate in hexane) to yield 5-benzyloxy-6-hydroxy-2-(1-phenyl-cyclopentylmethyl)-pyrimidine-4-carboxylic acid [2-(tert-butyl-dimethylsilanyloxy)-ethyl]-(4-fluoro-benzyl)-amide (312) (96 mg, 23.18%) as a colourless sticky solid.

1. extractionthe mixture was extracted with ethyl acetate (3×20 mL)
2. washThe combined organic part was washed with water (3×50 mL) and brine (2×30 mL)
3. customdried
4. concentrationconcentrated
5. customThe crude product was purified by Combi-Flash column (eluted at 20-30% ethyl acetate in hexane)