Reaktion #572856

Reaktionsgleichung

trans-(±)-2-bromo-5-n-propyl-4,4a,5,6,7,8,8a,9-octahydrothiazolo[4,5-g]quinoline

sulfuric acid

ammonium hydroxide

→

trans-(±)-5-n-propyl-4,4a,5,6,7,8,8a,9-octahydrothiazolo[4,5-g]quinolin-2(1H)-one

Reaktionsbedingungen

Aufarbeitung

1. 1
   Temperaturwas cooled
2. 2
   ExtraktionThe aqueous mixture was extracted several times with equal volumes of chloroform
3. 3
   Waschenthe combined extracts washed with saturated aqueous sodium chloride
4. 4
   Sonstigedried
5. 5
   SonstigeEvaporation of the chloroform in vacuo

Vorschrift

About 1.9 millimoles of trans-(±)-2-bromo-5-n-propyl-4,4a,5,6,7,8,8a,9-octahydrothiazolo[4,5-g]quinoline were dissolved in 10 ml. of 20% aqueous sulfuric acid. The solution was heated at about 100° C. for about five hours and then was cooled. The cooled solution was allowed to remain at ambient temperature for an additional 48 hours. The reaction mixture was then made basic with concentrated aqueous ammonium hydroxide. The aqueous mixture was extracted several times with equal volumes of chloroform. The chloroform extracts were combined, and the combined extracts washed with saturated aqueous sodium chloride and then dried. Evaporation of the chloroform in vacuo yielded trans-(±)-5-n-propyl-4,4a,5,6,7,8,8a,9-octahydrothiazolo[4,5-g]quinolin-2(1H)-one which was one spot material by TLC (9:1 CHCl3 /MeOH+trace NH4OH); Rf =0.37. The compound showed a strong band at 1650 cm-1 in the infrared indicating a carbonyl.

Quelle