Hydrochloric Acid → 2-[2-(2,2,2-Trifluoroethyl)guanidino]-4-(4-aminobutyl)-5-methylthiazole dihydrochloride

To a mixture of 2-[2-(2,2,2-trifluoroethyl)guanidino]-4-(4-phthalimidobutyl)-5-methylthiazole hydrochloride (0.60 g.) in water (2 ml.) and ethanol (2 ml.) was added sodium hydroxide pellets (0.2 g.). The resulting yellow solution was heated on a steam bath for 10 minutes and then allowed to cool to ambient temperature. The reaction mixture was adjusted to pH3 by addition of 2N hydrochloric acid and then reheated on a steam bath for 1 hour. After cooling to ambient temperature the mixture was extracted three times with equal volumes of ethyl acetate. The aqueous layer was evaporated to dryness, azeotroped twice with toluene, the residue dissolved in methanol (10 ml.) and the solution filtered. The filtrate was evaporated to dryness to give 2-[2-(2,2,2-trifluoroethyl)guanidino]-4-(4-aminobutyl)-5-methylthiazole dihydrochloride (0.31 g.) as an oil which was used without further purification.

1. temperatureThe resulting yellow solution was heated on a steam bath for 10 minutes
2. temperatureAfter cooling to ambient temperature the mixture
3. extractionwas extracted three times with equal volumes of ethyl acetate
4. customThe aqueous layer was evaporated to dryness
5. customazeotroped twice with toluene
6. dissolutionthe residue dissolved in methanol (10 ml.)
7. filtrationthe solution filtered
8. customThe filtrate was evaporated to dryness

ORD record

ord-4ac33b45e98d4c278020a8b9baaa502f

Source dataset

uspto-grants-1988_08

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US04762932