Methanol → 5-Amino-6,7-dichloro-2,3-dimethoxyquinoxaline
Reaction equation
[CH3:1][O-:2].[Na+].[NH2:4][C:5]1[C:14]([Cl:15])=[C:13]([Cl:16])[CH:12]=[C:11]2[C:6]=1[N:7]=[C:8](Cl)[C:9](Cl)=[N:10]2.[CH3:19][OH:20]>>[NH2:4][C:5]1[C:14]([Cl:15])=[C:13]([Cl:16])[CH:12]=[C:11]2[C:6]=1[N:7]=[C:8]([O:20][CH3:19])[C:9]([O:2][CH3:1])=[N:10]2Participants
4
Procedure
A solution of sodium methoxide (25% solution in methanol, 274 ml, 1.28 mol) was added to a suspension of 5-amino-2,3,6,7-tetrachloroquinoxaline (72.4 g, 0.256 mol) in dry methanol (1 I) and the resulting mixture was heated at reflux for 30 minutes. The mixture was cooled, concentrated under reduced pressure, and the residue partitioned between water and ethyl acetate (total of 8 I). The organic solution was dried (MgSO4) and concentrated under reduced pressure. The crude product was purified by trituration with methanol, followed by dissolution in dichloromethane (2 I) and filtration. The filtrate was concentrated under reduced pressure to give the title compound as a yellow solid (55.0 g, 79%).
Workup
- temperaturethe resulting mixture was heated
- temperatureat reflux for 30 minutes
- temperatureThe mixture was cooled
- concentrationconcentrated under reduced pressure
- customthe residue partitioned between water and ethyl acetate (total of 8 I)
- dry with materialThe organic solution was dried (MgSO4)
- concentrationconcentrated under reduced pressure
- customThe crude product was purified by trituration with methanol
- dissolutionfollowed by dissolution in dichloromethane (2 I)
- filtrationfiltration
- concentrationThe filtrate was concentrated under reduced pressure
Sources & evidence
- ORD record
- ord-2ed2a5c582594eab950f20e17a436c2b
- Source dataset
- uspto-grants-1998_12
- Patent number
- US05852016
Reaction notes
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