反应详情

A mixture of 3-thiopheneethanol methanesulfonate (ester) (0.286 mol), 1,2,4-triazole (0.571 mol) and potassium carbonate (39.47 g) in acetonitrile (1100 ml) was refluxed overnight. The mixture was filtered off and the filtrate was evaporated. The residue was taken up in water and extracted with dichloromethane. The organic layer was dried (MgSO4), filtered off and evaporated. The residue (49.08 g) was purified by column chromatography over silica gel (eluent: CH2Cl2 /CH3OH/NH4OH 99/1/0.1 to 97/3/0.1) (35-70 μm). The pure fractions were collected and evaporated, yielding 42.4 g (83%) of 1-[2-(3-thienyl)ethyl]-1H-1,2,4-triazole (interm. 1).

1. temperaturewas refluxed overnight
2. filtrationThe mixture was filtered off
3. customthe filtrate was evaporated
4. extractionextracted with dichloromethane
5. dry with materialThe organic layer was dried (MgSO4)
6. filtrationfiltered off
7. customevaporated
8. customThe residue (49.08 g) was purified by column chromatography over silica gel (eluent: CH2Cl2 /CH3OH/NH4OH 99/1/0.1 to 97/3/0.1) (35-70 μm)
9. customThe pure fractions were collected
10. customevaporated