Hydrochloric Acid → HCID 86609477, compound

Participants

Reaction Steps

A solution of (E)-4-(acetylsulfanyl)-3-({1-[2-(t-butoxycarbonylamino)ethyl]-1H-pyrazol-3-yl}methylidene)-1-[2-cyclopropyl-1-(2-fluorophenyl)-2-oxoethyl]piperidine (479 mg) in 4 N hydrogen chloride (in dioxane, 8 ml) was stirred at room temperature for one hour. The solvent and hydrogen chloride were removed in vacuo, and the residue was purified by chromatography on silica gel using a mixture of in ethanol and dichloromethane (2:98 to 20:80) as eluents to afford (E)-4-(acetylsulfanyl)-3-{[1-(2-aminoethyl)-1H-pyrazol-3-yl]methylidene}-1-[2-cyclopropyl-1-(2-fluorophenyl)-2-oxoethyl]piperidine dihydrochloride as a pale brown amorphous solid (450 mg). A part of the above compound (104.2 mg) was dissolved in ethanol (4 ml), and hydrogen chloride gas was passed therethrough with stirring at 0° C., and the resulting mixture was stirred under tightly sealed condition at room temperature for 5 hours. The solvent was removed in vacuo, and the residue was purified by chromatography on silica gel using a mixture of ethanol and dichloromethane (5:95 to 25:75) as the eluent to afford the title compound as a colourless amorphous solid (86.3 mg, overall yield: 90%).

Provenance & Evidence