反应详情

Add 1-[3-(dimethylamino)propyl]-3-ethylcarbodiimide hydrochloride (EDCI) (3.86 g, 20.2 mmol) and diisopropylethylamine (7.0 mL, 40.3 mmol) to a suspension of 5-phenylethynylnicotinic acid (3.0 g, 13.4 mmol) and N,O-dimethylhydroxylamine hydrochloride (1.97 g, 20.2 mmol) in tetrahydrofuran (100 mL) and stir at room temperature overnight. Concentrate the reaction mixture, dissolve the residue in ethyl acetate and wash sequentially with an aqueous solution of phosphate buffer (pH=7) and a saturated aqueous solution of sodium chloride. Dry the organic layer over magnesium sulfate, filter and concentrate. Purify the residue by silica gel chromatography, eluting with 50:50 ethyl acetate:hexanes, to give the title compound as a pale yellow solid (2.4 g, 67%).

1. concentrationConcentrate the reaction mixture
2. dissolutiondissolve the residue in ethyl acetate
3. washwash sequentially with an aqueous solution of phosphate buffer (pH=7)
4. dry with materialDry the organic layer over magnesium sulfate
5. filtrationfilter
6. concentrationconcentrate
7. customPurify the residue by silica gel chromatography
8. washeluting with 50:50 ethyl acetate