反应详情

温度

60 °C

The synthesis was performed with reference to the known literature (Tetrahedron, Vol. 29, p. 359, 1973). A solution of tert-butyl 4-[(6-hydroxy-3-oxo-2,3-dihydrobenzofuran-7-yl)methyl]piperazine-1-carboxylate (0.100 g, 0.287 mmol) in methanol (1.2 mL) was added with 1H-indazole-3-carboxaldehyde (0.0419 g, 0.287 mmol), and piperidine (0.00244 g, 0.0287 mmol) at room temperature, and the mixture was stirred at 60° C. for 3 hours. The solvent was evaporated, and the resulting residue was purified by silica gel column chromatography (chloroform/methanol) to obtain tert-butyl (Z)-4-({2-[(1H-indazol-3-yl)methylene]-6-hydroxy-3-oxo-2,3-dihydrobenzofuran-7-yl}methyl)piperazine-1-carboxylate (0.125 g, 91%).

1. customThe solvent was evaporated
2. customthe resulting residue was purified by silica gel column chromatography (chloroform/methanol)