4,4-dimethyl-6-fluoro-8-nitro-4H-benzo[b]tetrazolo[1,5-d][1,4]oxazine → 4,4-dimethyl-6-fluoro-4H-benzo[b]tetrazolo[1,5-d][1,4]oxazin-8-amine
Reaction equation
[CH3:1][C:2]1([CH3:19])[O:7][C:6]2[C:8]([F:15])=[CH:9][C:10]([N+:12]([O-])=O)=[CH:11][C:5]=2[N:4]2[N:16]=[N:17][N:18]=[C:3]12>CCO.[Pd]>[CH3:1][C:2]1([CH3:19])[O:7][C:6]2[C:8]([F:15])=[CH:9][C:10]([NH2:12])=[CH:11][C:5]=2[N:4]2[N:16]=[N:17][N:18]=[C:3]12Participants
Procedure
4,4-Dimethyl-6-fluoro-8-nitro-4H-benzo[b]tetrazolo[1,5-d][1,4]oxazine (0.82 g, 3.1 mmol) is dissolved in EtOH (20 ml). The clear solution is transferred to a Parr hydrogenation flask and placed under nitrogen. 10% Pd—C (0.25 g) was added to the Parr flask under nitrogen. The mixture was then transferred to a Parr hydrogenation apparatus, evacuated and filled with hydrogen (×3). The mixture was hydrogenated at 30 psi (optionally topping-up hydrogen) until LC/MS and TLC indicated complete reaction to the amine. After complete reaction, the mixture was placed under nitrogen and filtered through a small pad of Celite. The filter cake was washed with EtOH (×1) and the filtrate was concentrated in vacuo to leave the 4,4-dimethyl-6-fluoro-4H-benzo[b]tetrazolo[1,5-d][1,4]oxazin-8-amine in 72% yield (0.53 g). LCMS (m/z): 236 (MH+).
Workup
- customevacuated
- additionfilled with hydrogen (×3)
- customreaction to the amine
- customAfter complete reaction
- filtrationfiltered through a small pad of Celite
- washThe filter cake was washed with EtOH (×1)
- concentrationthe filtrate was concentrated in vacuo
Sources & evidence
- ORD record
- ord-21ea69df707647e5af47872956e11b89
- Source dataset
- uspto-grants-2015_10
- Patent number
- US09169249B2
Reaction notes
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