反应详情

According to the method of J. Chem. Soc. (C), 1664 (1967), combine methyl 2-methoxy-5-aminobenzoate (2.0 g, 11 mmol), N,N-dimethylformamide azine (1.56 g, 11 mmol), p-toluenesulfonic acid (190 mg) in toluene (25 mL). Fit the reaction vessel with a gas inlet such that the head space of the vessel is swept with argon and scrub the effluent through dilute aqueous hydrochloric acid solution. Heat to reflux. After 20 hours, concentrate the reaction mixture in vacuo to give a residue. Partition the residue between dichloromethane and a saturated aqueous sodium bicarbonate solution. Extract the aqueous layer twice with dichloromethane. Combine the organic layers, dry over MgSO4, filter, and evaporate in vacuo to give a residue. Chromatograph the residue on silica gel eluting sequentially with 70% ethyl acetate/dichloromethane and then 5% methanol/dichloromethane to give a residue. Recrystallize the residue form ethyl acetate/hexane to give methyl 2-methoxy-5-(4H-triazol-1-yl)benzoate: mp; 191-195.5° C.

1. customFit the reaction vessel with a gas inlet such that the head space of the vessel is swept with argon
2. temperatureHeat to reflux
3. concentrationconcentrate the reaction mixture in vacuo
4. customto give a residue
5. customPartition the residue between dichloromethane
6. extractionExtract the aqueous layer twice with dichloromethane
7. dry with materialdry over MgSO4
8. filtrationfilter
9. customevaporate in vacuo
10. customto give a residue
11. customRecrystallize the residue form ethyl acetate/hexane