Trifluoromethanesulfonic anhydride → HCID 66683785, compound

Participants

Reaction Conditions

Reaction Steps

N-(2-Cyclopropyl-4-fluoro-5-nitrophenyl)isobutyramide (1.90 g, 7.14 mmol, 1 equiv) was dissolved in acetonitrile (40 mL) under argon and cooled to −5° C. (external temperature). While maintaining the temperature at −5° C., trifluoromethanesulfonic anhydride (2.40 mL, 4.03 g, 14.27 mmol, 2 equiv) was added slowly dropwise and stirred for 1-2 minutes. Then trimethylsilyl azide (3.75 mL, 28.54 mmol, 4 equiv) was added slowly dropwise while maintaining the temperature at −5° C. TLC, LCMS indicated the reaction was complete in less than 1 minute. While maintaining the temperature at −5° C., the reaction was slowly quenched with ice-cold saturated NaHCO3 and diluted with EtOAc. The layers were separated, and the organic layer was washed with brine 1×, dried over Na2SO4, and concentrated to dryness. The crude product was absorbed onto silica gel and purified by flash chromatography and eluted with hex:EtOAc=100:0 to 25%-30% EtOAc using 5% EtOAc increments to afford 1-(2-cyclopropyl-4-fluoro-5-nitrophenyl)-5-isopropyl-1H-tetrazole (1.69 g, 78%) as a yellow solid.

Provenance & Evidence