Hydrochloric Acid → 5-Guanidinoimino-4-methyl-7-(2-thienyl)-5,6,7,8-tetrahydroquinoline hydrochloride

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Reaction Steps

A mixture of 4-methyl-7-(2-thienyl)-5,6,7,8-tetrahydroquinolin-5-one (0.52 g), aminoguanidine hydrochloride (0.25 g), concentrated hydrochloric acid (0.53 ml), water (0.53 ml) and ethanol (50 ml) was refluxed for 7 hours. Under reduced pressure, the solvent was evaporated, and the residue was dissolved in water. The solution was washed with diethylether and concentrated under reduced pressure, and the residue was recrystallized from water-ethanol to give 5-guanidinoimino-4-methyl-7-(2-thienyl)-5,6,7,8-tetrahydroquinoline hydrochloride (Compound 70) (0.57 g) as colorless crystals.

Provenance & Evidence