Hydrochloric Acid → HCID 178423835, compound

Participants

Reaction Conditions

Reaction Steps

A mixture of 4-methyl-7-(5-methyl-2-thienyl)-5,6,7,8-tetrahydroquinolin-5-one (257 mg), 1-amino-3-hydroxyguanidine p-toluenesulfonate (285 mg) and concentrated hydrochloric acid (0.2 ml) in ethanol (3 ml) was stirred at 90° C. (bath temperature) for 1 hour. The reaction solution was concentrated under reduced pressure, and to the residue were added ethyl acetate (30 ml), tetrahydrofuran (20 ml) and 0.2 N sodium hydroxide (20 ml). The mixture was shaken, and the separated upper layer was washed with 0.2 N sodium hydroxide (10 ml) and water (10 ml, thrice). To the upper layer was added 2 N hydrochloric acid (1 ml), and the mixture was concentrated under reduced pressure. The residue in ethanol (1 ml) was stirred at room temperature for 15 hours to give crystals, which were filtered and dried to give 5-(1-hydroxyguanidin-3-yl)imino-4-methyl-7-(5-methyl-2-thienyl)-5,6,7,8-tetrahydroquinoline hydrochloride (Compound 98) (163 mg) as pale yellow crystals.

Provenance & Evidence