Dichloromethane → HCID 178516483, compound

Participants

Reaction Steps

Sodium borohydride (131 mg) was added to a solution of (E)-3-[(1,2,4-triazol-3-yl)methylidene]-1-(triphenylmethyl)piperidin-4-one (2.92 g) in a mixed solvent of dichloromethane (60 ml) and methanol (60 ml) at 0° C. After the mixture was stirred at room temperature for 30 minutes, the reaction was quenched by addition of a saturated aqueous ammonium chloride solution. Products were extracted with ethyl acetate, and the extract was washed with a saturated aqueous sodium chloride solution and dried over anhydrous magnesium sulfate. Solvents were removed under reduced pressure to afford crude (E)-3-[(1,2,4-triazol-3-yl)methylidene]-1-(triphenylmethyl)piperidin-4-ol. The crude product was dissolved in acetonitrile (60 ml) and methyl bromoacetate (920 μl) was added. After DBU (1.25 ml) was added thereto under cooling at 0° C., the mixture was stirred at 0° C. for 15 minutes. Water and ethyl acetate were added to the mixture and the layers were separated. The organic layer was washed with a saturated aqueous sodium chloride solution and dried over anhydrous magnesium sulfate. Removal of the solvent by evaporation under reduced pressure gave an approximately 1:3 mixture of the two title isomers (2.98 g, yield: 87%) as a pale yellow amorphous solid.

Provenance & Evidence