Reaktion #2375907

Reaktionsgleichung

Trifluoroacetic acid

4-(4-bromothiophenoxy)-1-t-butoxycarbonylpiperidine

→

4-(4-bromothiophenoxy)piperidine

Ausbeute 100.0%

Lösungsmittel

dichloromethane

Reaktionsbedingungen

Aufarbeitung

1. 1
   Temperaturwas maintained between 5 and 10° C
2. 2
   workup.WAITat ambient temperature for 2 hours
3. 3
   SonstigeThe solution was evaporated
4. 4
   workup.ADDITIONThe residual oil was treated with a saturated aqueous solution of sodium carbonate
5. 5
   Extraktionextracted with ethyl acetate (3×70 ml)
6. 6
   Trocknendried (Na2SO4)
7. 7
   Sonstigeevaporated
8. 8
   SonstigeThe residue was purified by flash column chromatography on silica gel
9. 9
   workup.ADDITIONa mixture of 95:5:3, ethyl acetate

Vorschrift

Trifluoroacetic acid (7.5 ml) was added in portions to a stirred, ice-cooled solution of 4-(4-bromothiophenoxy)-1-t-butoxycarbonylpiperidine (2.6 g) in dry dichloromethane (5 ml) under an atmosphere of argon so that the temperature of the mixture was maintained between 5 and 10° C. The solution was stirred at 5° C. for 1 hour, then at ambient temperature for 2 hours. The solution was evaporated. The residual oil was treated with a saturated aqueous solution of sodium carbonate and extracted with ethyl acetate (3×70 ml). The ethyl acetate extracts were combined, dried (Na2SO4) and evaporated. The residue was purified by flash column chromatography on silica gel, using a mixture of 95:5:3, ethyl acetate:methanol:aqueous ammonia (density 0.88 g/cm3) as eluent, to give 4-(4-bromothiophenoxy)piperidine (1.9 g) as an off-white solid;

Quelle