Dimethylformamide → 4'-(2-Ethoxy-5-formyl-4-vinylimidazol-1-ylmethyl)biphenyl-2-carboxylic acid t-butyl ester

HRID 1693614Notes

Reaction equation

[C:1]([O:5][C:6]([C:8]1[C:9]([C:14]2[CH:19]=[CH:18][C:17]([CH2:20][N:21]3[C:25]([CH:26]=[O:27])=[C:24](Br)[N:23]=[C:22]3[O:29][CH2:30][CH3:31])=[CH:16][CH:15]=2)=[CH:10][CH:11]=[CH:12][CH:13]=1)=[O:7])([CH3:4])([CH3:3])[CH3:2].CN(C=O)C.[CH3:37][CH2:38]OC(C)=O>[Pd].C1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1.C1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1.C1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1.C1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1>[C:1]([O:5][C:6]([C:8]1[C:9]([C:14]2[CH:19]=[CH:18][C:17]([CH2:20][N:21]3[C:25]([CH:26]=[O:27])=[C:24]([CH:37]=[CH2:38])[N:23]=[C:22]3[O:29][CH2:30][CH3:31])=[CH:16][CH:15]=2)=[CH:10][CH:11]=[CH:12][CH:13]=1)=[O:7])([CH3:4])([CH3:3])[CH3:2]

Participants

Conditions

Temperature: 90 °C

Procedure

Intermediate (17a) (5.6 g, 11.5 mmol), tetrakis(triphenylphosphine) palladium(0) (2.1 g, 1.8 mmol), and (2-ethenyl)tri-n-butyltin (13.5 mL, 46.2 mmol) were dissolved in DMF (70 mL, 900 mmol), and heated at 90° C. for 1.5 hours. The mixture was cooled to room temperature and 300 mL of EtOAc was added. The organic layer was washed using a 20% potassium fluoride solution (2×100 mL) and saturated aqueous NaCl. The resulting material was purified by silica gel chromatography (0-60% EtOAc:hexanes) to yield intermediate (17b) (4.3 g). MS m/z: [MA-H+] calcd for C26H28N2O4, 433.2. found 433.4.

Workup

temperatureThe mixture was cooled to room temperature
washThe organic layer was washed
customThe resulting material was purified by silica gel chromatography (0-60% EtOAc:hexanes)

Sources & evidence

ORD record: ord-36894489c08748a6bfa90e38276b0a94
Source dataset: uspto-grants-2012_04
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08158659B2

Reaction notes

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