Boron trifluoride etherate → 3'-Fluoro-4'-[(4-{4-[1-(1-formylcyclobutyl)ethoxy]cyclohexyl}-5-oxo-7-propyl-4,5-dihydro[1,2,4]triazolo[1,5-a]pyrimidin-6-yl)methyl]biphenyl-2-carbonitrile

Participants

Reaction Conditions

Reaction Steps

A mixture of 3′-fluoro-4′-{[4-(5-methyl-6,13-dioxadispiro[3.2.5.2]tetradec-10-yl)-5-oxo-7-propyl-4,5-dihydro[1,2,4]triazolo[1,5-a]pyrimidin-6-yl]methyl}biphenyl-2-carbonitrile (0.64 g), sodium cyanoborohydride (0.33 g), boron trifluoride etherate (0.67 mL) and tetrahydrofuran (6 mL) was stirred at 70° C. for 20 hr. Saturated aqueous sodium hydrogen carbonate solution was added to the reaction mixture, and the mixture was extracted with ethyl acetate. The organic layer was washed with saturated brine, and dried over anhydrous magnesium sulfate. The solvent was evaporated under reduced pressure. The residue obtained by purification by silica gel column chromatography was mixed with Dess-Martin periodinane (0.49 g) and acetonitrile (5 mL), and the mixture was stirred at room temperature for 4 hr. Saturated aqueous sodium hydrogen carbonate solution and aqueous sodium thiosulfate solution were added to the reaction mixture, and the mixture was extracted with ethyl acetate. The organic layer was washed with saturated brine, and dried over anhydrous magnesium sulfate. The solvent was evaporated under reduced pressure, and the residue was purified by silica gel column chromatography to give the title compound as a colorless solid (0.21 g, 32%).

Provenance & Evidence