Water → 4'-[2-Propoxy-5-(hydroxyiminomethyl)-4-vinylimidazol-1-ylmethyl]-3'-fluorobiphenyl-2-carboxylic acid t-butyl ester

HRID 1802936Notes

Reaction equation

HRID 1802936 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)=[C:24]([CH:28]=[CH2:29])[N:23]=[C:22]3[O:30][CH2:31][CH2:32][CH3:33])=[C:16]([F:34])[CH:15]=2)=[CH:10][CH:11]=[CH:12][CH:13]=1)=[O:7])([CH3:4])([CH3:3])[CH3:2].Cl.[NH2:36][OH:37].O>N1C=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]=[N:36][OH:37])=[C:24]([CH:28]=[CH2:29])[N:23]=[C:22]3[O:30][CH2:31][CH2:32][CH3:33])=[C:16]([F:34])[CH:15]=2)=[CH:10][CH:11]=[CH:12][CH:13]=1)=[O:7])([CH3:2])([CH3:4])[CH3:3]

Participants

5

Reactant 3

HCID 962WaterHCID 443297Hydroxyamine hydrochlorideHCID 59830897HCID 59830897, compound

Product 1

HCID 725729564'-[2-Propoxy-5-(hydroxyiminomethyl)-4-vinylimidazol-1-ylmethyl]-3'-fluorobiphenyl-2-carboxylic acid t-butyl esterYield 99.6%

Reagents, catalysts & solvents 1

HCID 1049PyridineSolvent

Conditions

Temperature
40 °C

Procedure

Intermediate (18b) (7.2 g, 15.5 mmol) was dissolved in pyridine (30 mL). Hydroxylamine hydrochloride (4.0 g, 57.9 mmol) was added followed by water (20 mL) and the mixture was stirred at 40° C. for 2 hours. The reaction was quenched with water, extracted with 200 mL EtOAc, washed with 3×100 mL 1M phosphoric acid, 1×100 mL saturated sodium bicarbonate solution, and 2×100 mL saturated aqueous NaCl, then dried over MgSO4, filtered and concentrated in vacuo. The crude product was purified by silica gel chromatography (0-80% EtOAc:hexanes) to yield intermediate (18c) as a white solid (7.4 g). Anal. HPLC retention time=4.9 minutes. Gradient conditions: 25% solvent B/75% solvent A to 95% solvent B/5% solvent A over 6 minutes. MS m/z: [M+H+] calcd for C27H30FN3O4, 480.23. found 480.4. 1H-NMR (DMSO-d6) 10.99 (1H, s), 8.21 (1H, s), 7.67 (1H, d), 7.54 (1H, m), 7.44 (1H, s), 7.34 (1H, m), 7.11 (2H, m), 6.81 (2H, m), 5.73 (1H, d), 5.36 (2H, s), 5.10 (1H, d), 1.66 (2H, m), 1.13 (9H, s), 0.85 (4H, m).

Workup

  1. customThe reaction was quenched with water
  2. extractionextracted with 200 mL EtOAc
  3. washwashed with 3×100 mL 1M phosphoric acid, 1×100 mL saturated sodium bicarbonate solution, and 2×100 mL saturated aqueous NaCl
  4. dry with materialdried over MgSO4
  5. filtrationfiltered
  6. concentrationconcentrated in vacuo
  7. customThe crude product was purified by silica gel chromatography (0-80% EtOAc:hexanes)

Sources & evidence

ORD record
ord-8e16223a995e4965aa2e3428c2c944af
Source dataset
uspto-grants-2013_01
Patent number
US08349875B2

Reaction notes

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