4,5-Dihydro-1-(4-fluorophenyl)-5-[4-(methylthio)phenyl]pyrazol-3-amine → 1-(4-Fluorophenyl)-5-[4-(methylthio)phenyl]-3-pyrazolamine
Reaction equation
[F:1][C:2]1[CH:7]=[CH:6][C:5]([N:8]2[CH:12]([C:13]3[CH:18]=[CH:17][C:16]([S:19][CH3:20])=[CH:15][CH:14]=3)[CH2:11][C:10]([NH2:21])=[N:9]2)=[CH:4][CH:3]=1>ClCCl.[O-2].[Mn+4].[O-2]>[F:1][C:2]1[CH:3]=[CH:4][C:5]([N:8]2[C:12]([C:13]3[CH:18]=[CH:17][C:16]([S:19][CH3:20])=[CH:15][CH:14]=3)=[CH:11][C:10]([NH2:21])=[N:9]2)=[CH:6][CH:7]=1Participants
4
Procedure
A mixture of 4,5-dihydro-1-(4-fluorophenyl)-5-[4-(methylthio)phenyl]pyrazol-3-amine (1 g) and manganese (IV) oxide (1.16 g) in dichloromethane (100 ml) was stirred at ambient temperature for 2 hours. The insoluble was filtered and the filtrate was concentrated to dryness. The residue (1 g) was purified by column chromatography on silica gel (16 g) eluting with a mixture of chloroform and ethyl acetate (5:1 to give a pale brown powder of 1-(4-fluorophenyl)-5-[4-(methylthio)phenyl]pyrazol-3-amine (0.64 g).