Hydrochloric Acid → HCID 178490629, compound

To a solution of 7-(5-chloro-2-methoxyphenyl)-4-methyl-5,6,7,8-tetrahydroquinolin-5-one (1.0 g) and aminoguanidine hydrochloride (0.44 g) in ethanol (30 ml) were added a concentrated hydrochloric acid (0.83 ml) and water (0.83 ml), and the mixture was refluxed for 7 hours. Under reduced pressure, the solvent was evaporated, and the residue was dissolved in water. The solution was washed with ethyl acetate, and to the aqueous layer was added sodium hydrogen carbonate solution to make the solution alkaline. The mixture was extracted with ethyl acetate, and the organic layer was washed with water and saturated brine, dried with magnesium sulfate and concentrated under reduced pressure. The residue was dissolved in ethanol, and to the solution was added 1N hydrochloric acid (10 ml). The mixture was concentrated. And precipitated crystals were recrystallized from ethanol to give 7-(5-chloro-2-methoxyphenyl)-5-guanidinoimino-4-methyl-5,6,7,8-tetrahydroquinoline hydrochloride (Compound 166) (1.2 g) as colorless crystals.

1. temperaturethe mixture was refluxed for 7 hours
2. customUnder reduced pressure, the solvent was evaporated
3. dissolutionthe residue was dissolved in water
4. washThe solution was washed with ethyl acetate
5. additionto the aqueous layer was added sodium hydrogen carbonate solution
6. extractionThe mixture was extracted with ethyl acetate
7. washthe organic layer was washed with water and saturated brine
8. dry with materialdried with magnesium sulfate
9. concentrationconcentrated under reduced pressure
10. dissolutionThe residue was dissolved in ethanol
11. additionto the solution was added 1N hydrochloric acid (10 ml)
12. concentrationThe mixture was concentrated
13. customAnd precipitated crystals
14. customwere recrystallized from ethanol

ORD record

ord-a607fbbbd6104603b93b5d94044b30d3

Source dataset

uspto-grants-2002_02

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US06350749B1