反应详情

A solution of (E)-3-(5-cyano-2-methoxy-phenyl)-acrylic acid (0.916 g, 4.51 mmol), triethylamine (1.257 ml, 9.02 mmol) and 2-(1H-benzotriazol-1-yl)-1,1,3,3-tetramethyluronium tetrafluoroborate (1.44 g, 4.51 mmol) in DCM (10 ml) is treated with (R)-3-amino-4-[4-(4-fluoro-phenoxy)-piperidin-1-yl]-butyric acid benzyl ester. The reaction mixture is stirred at ambient temperature for 2 hours, then is washed with water, dried over MgSO4 and evaporated. The crude product is purified by flash silica chromatography (elution with 2:1 ethylacetate:hexane) to afford (R)-3-[(E)-3-(5-cyano-2-methoxy-phenyl)-acryloylamino]-4-[4-(4-fluoro-phenoxy)-piperidin-1-yl]-butyric acid benzyl ester. [MH]+ 572.1.

1. washis washed with water
2. dry with materialdried over MgSO4
3. customevaporated
4. customThe crude product is purified by flash silica chromatography (elution with 2:1 ethylacetate:hexane)