Hydrochloric Acid → (2Z)-2-(2H-indazol-3-ylmethylidene)-5,6-dimethoxy-7-(piperazin-1-ylmethyl)-1-benzofuran-3-one

Participants

Reaction Steps

A solution of tert-butyl (Z)-4-({2-[(1H-indazol-3-yl)methylene]-5,6-dimethoxy-3-oxo-2,3-dihydrobenzofuran-7-yl}methyl)piperazine-1-carboxylate (0.026 g, 0.050 mmol) in methylene chloride (2.0 mL) was added with a 4 M solution of hydrogen chloride in 1,4-dioxane (2.0 mL), and then the mixture was stirred at room temperature for 2 hours. After completion of the reaction, the mixture was azeotroped twice with toluene under reduced pressure. The residual solid was added with water, and then the mixture was adjusted to pH 9 with saturated aqueous sodium hydrogencarbonate, and extracted with chloroform. The organic layer was washed with saturated brine, and dried over anhydrous sodium sulfate, and then the solvent was evaporated under reduced pressure to obtain (Z)-2-[(1H-indazol-3-yl)methylene]-5,6-dimethoxy-7-(piperazin-1-ylmethyl)benzofuran-3(2H)-one (0.016 g, 76%).

Provenance & Evidence