Hydrogen Bromide → 6-{1-[4-(bromomethyl)phenyl]-2-[(2R)-5-oxopyrrolidin-2-yl]ethenyl}-3-chloropyridin-2(1H)-one

HRID 70624Notes

Reaction equation

[BrH:1].[Cl:2][C:3]1[CH:4]=[CH:5][C:6]([C:11]([C:19]2[CH:24]=[CH:23][C:22]([CH2:25]OCCC(C)C)=[CH:21][CH:20]=2)=[CH:12][C@@H:13]2[NH:17][C:16](=[O:18])[CH2:15][CH2:14]2)=[N:7][C:8]=1[O:9]C.C(=O)(O)[O-].[Na+].O>C(#N)C>[Br:1][CH2:25][C:22]1[CH:23]=[CH:24][C:19]([C:11]([C:6]2[NH:7][C:8](=[O:9])[C:3]([Cl:2])=[CH:4][CH:5]=2)=[CH:12][C@H:13]2[CH2:14][CH2:15][C:16](=[O:18])[NH:17]2)=[CH:20][CH:21]=1

Participants

Conditions

Temperature: 70 °C

Procedure

48% hydrobromic acid (4 mL) was added to a solution of (5R)-5-[2-(5-chloro-6-methoxypyridin-2-yl)-2-{4-[(3-methylbutoxy)methyl]phenyl}ethenyl]pyrrolidin-2-one (E:Z=1:2 mixture) (396 mg) in acetonitrile (4 mL) at room temperature, and the mixture was stirred at 70° C. for three hours. Saturated aqueous sodium bicarbonate and water were sequentially added to the reaction solution at room temperature, followed by extraction with chloroform. The organic layers were dried over anhydrous sodium sulfate and filtered. The solvent was then evaporated under reduced pressure. The resulting residue was purified by silica gel column chromatography (chloroform:methanol=50:1→5:1) to give 6-{1-[4-(bromomethyl)phenyl]-2-[(2R)-5-oxopyrrolidin-2-yl]ethenyl}-3-chloropyridin-2(1H)-one (E:Z=1:2 mixture) (321 mg, 85%).

Workup

extractionfollowed by extraction with chloroform
dry with materialThe organic layers were dried over anhydrous sodium sulfate
filtrationfiltered
customThe solvent was then evaporated under reduced pressure
customThe resulting residue was purified by silica gel column chromatography (chloroform:methanol=50:1→5:1)

Sources & evidence

ORD record: ord-a28bd9dc718a485b943c6f9a802972c3
Source dataset: uspto-grants-2014_09
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08822503B2

Reaction notes

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