Phosphorus oxychloride → 5-(4-Bromo-2-fluoro-phenylamino)-8-fluoro-imidazo[1,5-a]pyridine-6-carboxylic acid methyl ester

HRID 2064000Notes

Reaction equation

[CH3:1][O:2][C:3](=[O:24])[C:4]1[CH:9]=[C:8]([F:10])[C:7]([CH2:11][NH:12][CH:13]=O)=[N:6][C:5]=1[NH:15][C:16]1[CH:21]=[CH:20][C:19]([Br:22])=[CH:18][C:17]=1[F:23].P(Cl)(Cl)(Cl)=O>C1(C)C=CC=CC=1>[CH3:1][O:2][C:3]([C:4]1[CH:9]=[C:8]([F:10])[C:7]2[N:6]([CH:13]=[N:12][CH:11]=2)[C:5]=1[NH:15][C:16]1[CH:21]=[CH:20][C:19]([Br:22])=[CH:18][C:17]=1[F:23])=[O:24]

Participants

Conditions

Temperature: 90 °C

Procedure

To a suspension of 2-(4-bromo-2-fluoro-phenylamino)-5-fluoro-6-formylaminomethyl-nicotinic acid methyl ester (2.49 g, 6.2 mmol) in toluene (60 mL) was added phosphorous oxychloride (0.65 mL, 7.0 mmol). The reaction mixture was heated to 90° C. and stirred for 1.5 hour before cooling to room temperature and concentrating in vacuo. The resultant residue was dissolved in ethyl acetate and washed with water followed by a saturated aqueous solution of sodium bicarbonate and then brine. The organic phase was isolated, dried (MgSO4), filtered and concentrated in vacuo. The resultant residue was subjected to flash chromatography (Si-PPC, gradient 0% to 100%, ether in hexane) to afford the title compound as a yellow solid (692 mg, 29%). LCMS (method B): RT=3.97 min, [M+H]+=382/384.

Workup

temperaturebefore cooling to room temperature
concentrationconcentrating in vacuo
dissolutionThe resultant residue was dissolved in ethyl acetate
washwashed with water
customThe organic phase was isolated
dry with materialdried (MgSO4)
filtrationfiltered
concentrationconcentrated in vacuo

Sources & evidence

ORD record: ord-98f07b61457940ffbfdeeb5137246858
Source dataset: uspto-grants-2012_10
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08288408B2

Reaction notes

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