Triphenylphosphine dibromide → 5-(4-(bromomethyl)-5,6-dihydro-2H-pyran-3-yl)-1-isopropyl-1H-pyrazole
Reaction equation
[CH:1]([N:4]1[C:8]([C:9]2[CH2:14][O:13][CH2:12][CH2:11][C:10]=2[CH2:15]O)=[CH:7][CH:6]=[N:5]1)([CH3:3])[CH3:2].[Br:17]P(Br)(C1C=CC=CC=1)(C1C=CC=CC=1)C1C=CC=CC=1>C(Cl)Cl>[Br:17][CH2:15][C:10]1[CH2:11][CH2:12][O:13][CH2:14][C:9]=1[C:8]1[N:4]([CH:1]([CH3:3])[CH3:2])[N:5]=[CH:6][CH:7]=1Participants
4
Procedure
To a solution of (5-(1-isopropyl-1H-pyrazol-5-yl)-3,6-dihydro-2H-pyran-4-yl)methanol (300 mg, 1.35 mmol) in DCM (5 mL) was added dibromotriphenylphosphorane (630 mg, 1.35 mmol) at room temperature, after stirring for 30 min, it was diluted with DCM, organic layer was washed with Sat. NaHCO3, brine, dried and concentrated to give crude product, which was purified by column (Hexanes/EtOAc=4:1) to give 5-(4-(bromomethyl)-5,6-dihydro-2H-pyran-3-yl)-1-isopropyl-1H-pyrazole (360 mg).