Ammonium Chloride → 6-amino-2,2,7-trifluoro-4-(prop-2-ynyl)-2H-benzo[b][1,4]oxazin-3(4H)-one

HRID 403160Notes

Reaction equation

[Cl-].[NH4+].[F:3][C:4]1([F:22])[O:9][C:8]2[CH:10]=[C:11]([F:17])[C:12]([N+:14]([O-])=O)=[CH:13][C:7]=2[N:6]([CH2:18][C:19]#[CH:20])[C:5]1=[O:21]>O.CO.O1CCCC1.[Fe]>[NH2:14][C:12]1[C:11]([F:17])=[CH:10][C:8]2[O:9][C:4]([F:3])([F:22])[C:5](=[O:21])[N:6]([CH2:18][C:19]#[CH:20])[C:7]=2[CH:13]=1

Participants

Conditions

Temperature: 70 °C

Procedure

To ammonium chloride (3.96 g, 74.0 mmol) in water was added iron powder (325 mesh; 4.13 g, 74.0 mmol). To the resulting mixture was added 2,2,7-trifluoro-6-nitro-4-(prop-2-ynyl)-2Hbenzo[b][1,4]oxazin-3(4H)-one (7.06 g, 24.67 mmol) in methanol/tetrahydrofuran. The resulting mixture was stirred vigorously at 70° C. for 2 hours. The reaction was quenched in water/ethyl acetate under stirring. The resulting 2 phase system was filtered and the layers were separated. The water layer was subsequently extracted with ethyl acetate. The combined organic phases were washed with brine, dried with Na2SO4 and concentrated to yield 5.15 g of the title compound. GCMS m/e (M+)=256

Workup

customThe reaction was quenched in water/ethyl acetate
stirringunder stirring
filtrationThe resulting 2 phase system was filtered
customthe layers were separated
extractionThe water layer was subsequently extracted with ethyl acetate
washThe combined organic phases were washed with brine
dry with materialdried with Na2SO4
concentrationconcentrated

Sources & evidence

ORD record: ord-da77a239c4c046fcaa4283e31d9723ce
Source dataset: uspto-grants-2014_06
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08748348B2

Reaction notes

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