Sodium Dithionite → 7-Chloro-3,4-dihydro-6-methyl-2(1H)-quinoxalinone

HRID 1068658Notes

Reaction equation

[K+].[Cl:2][C:3]1[C:8]([CH3:9])=[CH:7][C:6]([NH:10][CH2:11][C:12]([O-])=[O:13])=[C:5]([N+:15]([O-])=O)[CH:4]=1.S(S([O-])=O)([O-])=O.[Na+].[Na+]>O>[Cl:2][C:3]1[CH:4]=[C:5]2[C:6]([NH:10][CH2:11][C:12](=[O:13])[NH:15]2)=[CH:7][C:8]=1[CH3:9]

Participants

Conditions

Temperature: 80 °C

Procedure

To a stirred bright orange solution of N-(4′-chloro-5′-methyl-2′-nitrophenyl)glycine potassium salt (0.097 g, 0.36 mmol) in water (5.0 mL) at 80° C., sodium dithionite (0.500 g, 2.87 mmol) was added in two equal portions. It instantly formed a white suspension, which was stirred at 80° C. for 1 h. It was then cooled at room temperature and the solid was vacuum filtered, washed with water (5.0 mL), and dried in vacuo to yield 0.062 g (86%) of the title compound as a white powder; 1H NMR (DMSO-d6): δ 2.10 (s, 3H), 3.66 (s, 2H, J=1.2 Hz), 5.98 (s, 1H), 6.53 (s, 1H), 6.67 (s, 1H), 10.20 (s, 1H).

Workup

customIt instantly formed a white suspension, which
temperatureIt was then cooled at room temperature
filtrationfiltered
washwashed with water (5.0 mL)
customdried in vacuo

Sources & evidence

ORD record: ord-86ed3149f4ed468793c73142ff3799ff
Source dataset: uspto-grants-2001_06
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US06251903B1

Reaction notes

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