Hydrochloric Acid → HCID 178480241, compound

Participants

Reaction Steps

A mixture of 5-nitro-3-(1-methylpiperidin-4-yl)-1H-indazole (287 mg, 1.1 mmol), 5N aqueous hydrochloric acid (0.5 mL), water (5 ml), and methanol (15 mL) was warmed to give a homogeneous solution. Palladium (86 mg, 5% on carbon) was added to the solution and the resulting mixture was stirred under an atmosphere of hydrogen gas for 24 hours. The palladium catalyst was filtered and the filtrate was concentrated in vacuo. The residue was slurried in methylene chloride and 5N aqueous sodium hydroxide then extracted with chloroform/isopropanol (3:1). The organic extracts were dried over sodium sulfate, filtered, and concentrated in vacuo to give 261 mg of a light brown foam. Purification by radial chromatography (silica gel, 2000 micron rotor, methylene chloride:methanol:ammonium hydroxide, 100:10:1) gave 223 mg (87.8%) of a brown oil. The product was crystallized as the dihydrochloride salt. EA calculated for C13H20Cl2N4 : C, 51.49; H, 6.65; N, 18.48.

Provenance & Evidence