Hydrochloric Acid → HCID 18960736, compound

Participants

Reaction Steps

To the mixture of conc. hydrochloric acid (3.2 ml) and ethanol (2 ml) is added 1-[1-{4-[2-(2-nitrophenyl)thio-1-imidazolyl]benzoyl}-4-piperidinyl]-3,4-dihydrocarbostyril (2.0 g), and thereto is added dropwise a solution of stannous chloride dihydrate (2.7 g) in ethanol (4 ml) at a temperature below 25° C. with water-cooling, and the mixture is stirred at room temperature for two hours. The mixture is poured into ice-water and basified with aqueous sodium hydroxide solution, extracted with chloroform, washed with water, and dried over sodium sulfate. After concentrated under reduced pressure, the resulting residue is purified by silica gel column chromatography (eluent; chloroform:methanol=50:1-25:1), and further dissolved in methanol. The mixture is added dropwise with stirring into water (about 40 ml) and the resulting precipitates are collected by filtration and dried to give 1-[1-{4-[2-(2-aminophenyl)thio-1-imidazolyl]benzoyl}-4-piperidinyl}-3,4-dihydrocarbostyril (1.6 g) as white powder.

Provenance & Evidence