反应详情

To a stirred solution of 5-benzyloxy-6-hydroxy-2-(1-pyridin-2-yl-cyclopentylmethyl)-pyrimidine-4-carboxylic acid (437) (150 mg, 0.37 mmol) in dimethylformamide (5 mL), N,N-diisopropylethylamine (0.184 mL, 1.111 mmol), HATU (211.24 mg, 0.556 mmol), and [2-(tert-butyl-dimethylsilanyloxy)-ethyl]-cyclopropylmethyl-amine (8i) were added, then this reaction mixture was allowed to stir for 16 h at room temperature while silica thin layer chromatography was performed (50% ethyl acetate in hexane; Rf=0.5). The reaction mixture was quenched with ice cold water (25 mL) then extracted with ethyl acetate (2×30 mL). The organic part was dried and concentrated. The resulting crude product was purified by normal silica gel (100-200 mesh) column chromatography using 30-40% ethyl acetate in hexane as gradient polarity mobile phase to get 5-benzyloxy-6-hydroxy-2-(1-pyridin-2-yl-cyclopentylmethyl)-pyrimidine-4-carboxylicacid [2-(tert-butyl-dimethylsilanyloxy)-ethyl]-cyclopropylmethyl-amide (446) (198 mg, 87%) as a colorless gummy liquid.

1. customThe reaction mixture was quenched with ice cold water (25 mL)
2. extractionthen extracted with ethyl acetate (2×30 mL)
3. customThe organic part was dried
4. concentrationconcentrated
5. customThe resulting crude product was purified by normal silica gel (100-200 mesh) column chromatography