Acetic Acid → 3-[5-(4-Bromo-phenyl)-1H-imidazol-2-yl]-2-aza-bicyclo[2.2.1]heptane-2-carboxylic acid tert-butyl ester

HRID 1185638Notes

Reaction equation

[C:1]([O:5][C:6]([N:8]1[CH:13]([C:14](=O)[NH:15][CH2:16][C:17]([C:19]2[CH:24]=[CH:23][C:22]([Br:25])=[CH:21][CH:20]=2)=O)[CH:12]2[CH2:27][CH:9]1[CH2:10][CH2:11]2)=[O:7])([CH3:4])([CH3:3])[CH3:2].C(O)(=O)C.C([O-])(=O)C.[NH4+:36]>C1(C)C(C)=CC=CC=1>[C:1]([O:5][C:6]([N:8]1[CH:13]([C:14]2[NH:36][C:17]([C:19]3[CH:24]=[CH:23][C:22]([Br:25])=[CH:21][CH:20]=3)=[CH:16][N:15]=2)[CH:12]2[CH2:27][CH:9]1[CH2:10][CH2:11]2)=[O:7])([CH3:4])([CH3:3])[CH3:2]

Participants

Conditions

Temperature: 140 °C

Procedure

The mixture of 3-[2-(4-bromo-phenyl)-2-oxo-ethylcarbamoyl]-2-aza-bicyclo[2.2.1]heptane-2-carboxylic acid tert-butyl ester (1.7 g, 4 mmol), acetic acid (24 μl), and ammonium acetate (1.54 g, 20 mmol) in xylene (20 ml) was heated at 140° C. for 20 hours. The mixture was quenched with saturated sodium carbonate solution, and extracted with EtOAc. The organic phase was washed with water and brine, and was dried with sodium sulfate. Concentration and purification by flash column chromatography (hexanes/EtOAc) gave 3-[5-(4-bromo-phenyl)-1H-imidazol-2-yl]-2-aza-bicyclo[2.2.1]heptane-2-carboxylic acid tert-butyl ester (1.21 g). m/z: 417.9 (M+H)+.

Workup

customThe mixture was quenched with saturated sodium carbonate solution
extractionextracted with EtOAc
washThe organic phase was washed with water and brine
dry with materialwas dried with sodium sulfate
concentrationConcentration and purification by flash column chromatography (hexanes/EtOAc)

Sources & evidence

ORD record: ord-3e22ad652e3747adad1f9970f8ef1527
Source dataset: uspto-grants-2014_03
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08669234B2

Reaction notes

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