Reaktion #9256

Reaktionsgleichung

N-ethyl-N′-[7-(phenylsulfanyl)-4,5-dihydro-1,3-benzothiazol-2-yl]urea

DDQ

→

N-Ethyl-N′-[7-(phenylsulfanyl)-1,3-benzothiazol-2-yl]urea

Lösungsmittel

toluene

Reaktionsbedingungen

Aufarbeitung

1. 1
   SonstigeThe toluene was removed in vacuo
2. 2
   WaschenThe organic phase was washed with 0.5 M NaOH (2 times)
3. 3
   Trocknendried over MgSO4
4. 4
   SonstigeThe crude oil was purified by flash chromatography on SiO2 (EtOAc/CH2Cl2 5/95)
5. 5
   Sonstige445 mg (85%, 2 steps) of pure product was isolated

Vorschrift

To a mixture of N-ethyl-N′-[7-(phenylsulfanyl)-4,5-dihydro-1,3-benzothiazol-2-yl]urea (crude product from the previous reaction, 1.59 mmol) in toluene (35.0 mL) was added DDQ (500 mg, 2.17 mmol). The reaction mixture was stirred at about 20° C. for about 2 hrs. The toluene was removed in vacuo and the crude material was taken up in CH2Cl2. The organic phase was washed with 0.5 M NaOH (2 times) and dried over MgSO4. The crude oil was purified by flash chromatography on SiO2 (EtOAc/CH2Cl2 5/95). 445 mg (85%, 2 steps) of pure product was isolated. LC/MS 330 (MH+); RP-HPLC RT 17.56 min.

Quelle