Reaktion #706241

Reaktionsgleichung

4-(2-benzyloxy-phenyl)-thiazol-2-ylamine hydrobromide

p-toluenesulfonyl chloride

hydrochloric acid

→

N-[4-(2-benzyloxy-phenyl)-thiazol-2-yl]-4-methyl-benzenesulfonamide

Ausbeute 46.6%

Lösungsmittel

pyridine

Reaktionsbedingungen

Aufarbeitung

1. 1
   Extraktionthe mixture was extracted with ethyl acetate
2. 2
   TrocknenThe organic phase was dried with magnesium sulphate
3. 3
   Einengenconcentrated
4. 4
   workup.DISSOLUTIONThe residue was dissolved in a mixture of 20 ml of ethanol and 20 ml of 2N sodium hydroxide solution
5. 5
   workup.ADDITIONAfter the addition of 0.4 g of active charcoal the mixture
6. 6
   Filtrationsubsequently the active charcoal was filtered off
7. 7
   EinengenAfter neutralization with concentrated hydrochloric acid the mixture was concentrated
8. 8
   Extraktionthe aqueous residue was extracted twice with ethyl acetate
9. 9
   Trocknendried with magnesium sulphate
10. 10
    SonstigeThe residue was chromatographed on 60 g of Kieselgel 60 with ethyl acetate/hexane (1:2) as the eluent
11. 11
    EinengenThe product-containing fractions were concentrated

Vorschrift

A mixture of 0.5 g of 4-(2-benzyloxy-phenyl)-thiazol-2-ylamine hydrobromide with 0.29 g of p-toluenesulfonyl chloride was stirred for 2 hours with 2 ml of pyridine. The resulting, red colored suspension was poured into 30 ml of 1N hydrochloric acid and the mixture was extracted with ethyl acetate. The organic phase was dried with magnesium sulphate and concentrated. The residue was dissolved in a mixture of 20 ml of ethanol and 20 ml of 2N sodium hydroxide solution. After the addition of 0.4 g of active charcoal the mixture was stirred at room temperature for 30 minutes and subsequently the active charcoal was filtered off. After neutralization with concentrated hydrochloric acid the mixture was concentrated and the aqueous residue was extracted twice with ethyl acetate. The organic phases were combined, dried with magnesium sulphate and freed from solvent. The residue was chromatographed on 60 g of Kieselgel 60 with ethyl acetate/hexane (1:2) as the eluent. The product-containing fractions were concentrated and yielded 0.28 g of N-[4-(2-benzyloxy-phenyl)-thiazol-2-yl]-4-methyl-benzenesulfonamide as a colorless, amorphous solid.

Quelle