Reacción #51139

Ecuación de reacción

Methyl amide

4-[3-(ethylsulfonyl)propyl]-N-methylbicyclo[2.2.2]octane-1-carboxamide

oxalyl chloride

5[2-(trifluoromethyl)phenyl]1H-tetrazole

→

3-{4-[3-(ethylsulfonyl)propyl]bicyclo[2.2.2]oct-1-yl}-4methyl-5-[2-(trifluoromethyl)phenyl]-4H -1,2,4-triazole

3-{4-[3-(Ethylsulfonyl)propyl]bicyclo[2.2.2]oct-1-yl}-4-methyl-5-[2-(trifluoromethyl)phenyl]-4H -1,2,4-triazole

Disolventes

methylene chloride

methylene chloride

Condiciones de reacción

Tratamiento posterior

1. 1
   Otrosolvent removed by evaporation under reduced pressure
2. 2
   workup.DISSOLUTIONThe residue was redissolved in anhydrous toluene (7 mL)
3. 3
   TemperaturaThe mixture was refluxed for 18 h
4. 4
   TemperaturaThe reaction was cooled to room temperature
5. 5
   Filtraciónthe precipitate was filtered
6. 6
   Lavadowashed
7. 7
   Otroto give 300 mg of crude product as the HCl salt
8. 8
   Lavadothe aqueous layer was washed with two additional portions of methylene chloride
9. 9
   Otroevaporated
10. 10
    Otrothe residue was chromatographed by flash silica gel chromatography
11. 11
    LavadoElution
12. 12
    Otroevaporated

Procedimiento

Methyl amide 11-9 (0.470 g, 1.56 mmol) was dissolved in anhydrous methylene chloride (5 mL) and treated with oxalyl chloride (2M in methylene chloride, 1.56 mL, 3.12 mmol) and DMF (2 drops). The solution was stirred at room temperature for 1 h, then solvent removed by evaporation under reduced pressure. The residue was redissolved in anhydrous toluene (7 mL) and treated with 5[2-(trifluoromethyl)phenyl]1H-tetrazole (368 mg, 1.72 mmol). The mixture was refluxed for 18 h. The reaction was cooled to room temperature and the precipitate was filtered and washed to give 300 mg of crude product as the HCl salt. The salt was taken up in methylene chloride/1N HCl and the aqueous layer was washed with two additional portions of methylene chloride. The organic layers were combined and evaporated and the residue was chromatographed by flash silica gel chromatography. Elution was carried out with a gradient ranging from 0 to 5% methanol/methylene chloride. The appropriate fractions were combined and evaporated to give 3-{4-[3-(ethylsulfonyl)propyl]bicyclo[2.2.2]oct-1-yl}-4methyl-5-[2-(trifluoromethyl)phenyl]-4H -1,2,4-triazole (11-10) as a white powder.

Fuente