反应详情

To a stirred solution mixture of 5-benzyloxy-6-hydroxy-2-(1-phenyl-cyclopentylmethyl)-pyrimidine-4-carboxylic acid (283) (100 mg, 0.25 mmol) and [2-(tert-butyl-dimethylsilanyloxy)-ethyl]-cyclopentyl-amine (8e) (72 mg, 0.29 mmol) in dimethylformamide (2.5 mL) were added N,N-diisopropylethylamine (0.1 mL, 0.74 mmol) and HATU (141 mg, 0.37 mmol). Stirring was continued at room temperature for 20 h, whereafter water (25 mL) was added and the mixture 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 get 5-benzyloxy-6-hydroxy-2-(1-phenyl-cyclopentylmethyl)-pyrimidine-4-carboxylic acid [2-(tert-butyl-dimethylsilanyloxy)-ethyl]-cyclopentyl-amide (288) (97 mg, 62.28%) as a light yellow sticky solid.

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