Triethylamine → [(2-Diphenylmethylamino-4,5-dihydronaphtho[1,2-d]thiazol-6-yl]oxy]acetic acid

To a mixture of ethyl [(6-bromo-5,6,7,8-tetrahydro-5-oxo-1-naphthalenyl)oxy]acetate (1.10 g, 3.36 mmol), N-(diphenylmethyl)thiourea (900 mg, 3.70 mmol), and ethanol (15 mL) was added triethylamine (0.51 mL, 3.70 mmol), and the mixture was refluxed for 6 hours. After cooling, the reaction mixture was diluted with water and extracted with ethyl acetate. The organic layer was washed with 1N-hydrochloric acid, saturated aqueous sodium chloride solution, and water, dried over MgSO4, and filtered. The filtrate was concentrated under reduced pressure. To a solution of this concentration residue (0.79 g, 1.70 mmol) in tetrahydrofuran (16 mL)-methanol (4 mL) was added 1N-aqueous sodium hydroxide solution (2.0 mL) dropwise and the mixture was stirred at room temperature for 10 minutes. The solvent was then distilled off under reduced pressure and the residue was recrystallized from acetic acid-water to provide 0.49 g of the title compound. Yield 33%.

1. temperaturethe mixture was refluxed for 6 hours
2. temperatureAfter cooling
3. extractionextracted with ethyl acetate
4. washThe organic layer was washed with 1N-hydrochloric acid, saturated aqueous sodium chloride solution, and water
5. dry with materialdried over MgSO4
6. filtrationfiltered
7. concentrationThe filtrate was concentrated under reduced pressure
8. distillationThe solvent was then distilled off under reduced pressure
9. customthe residue was recrystallized from acetic acid-water

ORD-Eintrag

ord-ba9be404e04844b6a24e1f4539ae6562

Quelldatensatz

uspto-grants-2002_07

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US06417213B2