Stannous chloride dihydrate → 5-Bromo-2-(4-methoxyphenyl)pyridin-3-amine

HRID 1431369Notes

Reaction equation

[Br:1][C:2]1[CH:3]=[C:4]([N+:16]([O-])=O)[C:5]([C:8]2[CH:13]=[CH:12][C:11]([O:14][CH3:15])=[CH:10][CH:9]=2)=[N:6][CH:7]=1.O.O.[Sn](Cl)Cl>CCOC(C)=O>[Br:1][C:2]1[CH:3]=[C:4]([NH2:16])[C:5]([C:8]2[CH:9]=[CH:10][C:11]([O:14][CH3:15])=[CH:12][CH:13]=2)=[N:6][CH:7]=1

Participants

Conditions

Temperature: 70 °C

Procedure

To a stirred mixture of 5-bromo-2-(4-methoxyphenyl)-3-nitropyridine (0.19 g, 0.60 mmol) in EtOAc (10 mL) was added tin(II) chloride dihydrate (0.67 g, 3.00 mmol) in portions. Upon complete addition of the reducing agent, the mixture was carefully heated to 70° C. After 20 h, the reaction was cooled to rt and diluted with ethyl acetate, then washed with 1M NaOH, water, and brine. After drying over anhydrous sodium sulfate and filtration, the organic solvent was removed under reduced pressure. The light yellow solid was identified as 5-bromo-2-(4-methoxyphenyl)pyridin-3-amine. 1H NMR (400 MHz, DMSO-d6) δ ppm 7.90 (1H, d, J=2.0 Hz), 7.57 (2H, d, J=8.8 Hz), 7.35 (1H, d, J=2.0 Hz), 7.01 (2H, d, J=8.8 Hz), 5.36 (2H, s), 3.80 (3H, s).

Workup

additionUpon complete addition of the reducing agent
temperaturethe reaction was cooled to rt
washwashed with 1M NaOH, water, and brine
dry with materialAfter drying over anhydrous sodium sulfate and filtration
customthe organic solvent was removed under reduced pressure

Sources & evidence

ORD record: ord-faffe1edfbcf4de0890203e0c9e94b63
Source dataset: uspto-grants-2015_01
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08940724B2

Reaction notes

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