Boron trifluoride etherate → HCID 178513156, compound
Reaction equation
[Br:1][C:2]1[CH:7]=[CH:6][C:5]([Cl:8])=[CH:4][C:3]=1[C:9](=O)[CH2:10][CH2:11][C:12]([F:18])([F:17])[C:13]([F:16])([F:15])[F:14].[C:20]([NH:23][NH2:24])([NH2:22])=[NH:21].Cl.B(F)(F)F.CCOCC>CO>[Br:1][C:2]1[CH:7]=[CH:6][C:5]([Cl:8])=[CH:4][C:3]=1/[C:9](=[N:24]/[NH:23][C:20](=[NH:21])[NH2:22])/[CH2:10][CH2:11][C:12]([F:18])([F:17])[C:13]([F:16])([F:15])[F:14]Participants
5
Conditions
- Temperature
- 100 °C
Procedure
To a screw cap pressure vessel was added the intermediate from Step B (0.450 g, 1.2 mmol), aminoguanidine hydrochloride (0.456 g, 6.2 mmol), methanol (20 mL) and boron trifluoride diethyl etherate (0.94 mL, 7.4 mmol). The reaction solution was heated at 100° C. for 3 hours. The solution was concentrated and the residue partitioned between EtOAc and aqueous 1N NaOH. The organic phase was washed twice with aqueous 1N NaOH and brine (1×). The organic phase was dried over anhydrous magnesium sulfate, filtered and concentrated to give the indicated compound as a mixture of E,Z hyrazone isomers. 1H NMR (500 MHz, CH3OH-d4): δ 7.60 (d, J=8.6 Hz, 1H); 7.26-7.23 (m, 1H); 7.18 (d, J=2.5 Hz, 1H); 2.74 (s, 2H); 2.56 (s, 2H). m/z=421.2 (M+H).
Workup
- customTo a screw cap pressure vessel
- concentrationThe solution was concentrated
- customthe residue partitioned between EtOAc and aqueous 1N NaOH
- washThe organic phase was washed twice with aqueous 1N NaOH and brine (1×)
- dry with materialThe organic phase was dried over anhydrous magnesium sulfate
- filtrationfiltered
- concentrationconcentrated
- customto give the indicated compound
- additionas a mixture of E,Z hyrazone isomers
Sources & evidence
- ORD record
- ord-04af3ed8111f40aa97bd75802e5ce216
- Source dataset
- uspto-grants-2016_06
- Patent number
- US09365574B2
Reaction notes
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