Potassium Carbonate → 2-[5-(4'-Chloro-2'-cyano-biphenyl-4-yl)-1H-imidazol-2-yl]-pyrrolidine-1-carboxylic acid tert-butyl ester

HRID 79807Notes

Reaction equation

HRID 79807 reaction equation
[C:1]([O:5][C:6]([N:8]1[CH2:12][CH2:11][CH2:10][CH:9]1[C:13]1[NH:14][C:15]([C:18]2[CH:23]=[CH:22][C:21](B3OC(C)(C)C(C)(C)O3)=[CH:20][CH:19]=2)=[CH:16][N:17]=1)=[O:7])([CH3:4])([CH3:3])[CH3:2].Br[C:34]1[CH:41]=[CH:40][C:39]([Cl:42])=[CH:38][C:35]=1[C:36]#[N:37].C(=O)([O-])[O-].[K+].[K+]>C1C=CC([P]([Pd]([P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)([P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)[P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)=CC=1.C([O-])(O)=O.[Na+]>[C:1]([O:5][C:6]([N:8]1[CH2:12][CH2:11][CH2:10][CH:9]1[C:13]1[NH:14][C:15]([C:18]2[CH:19]=[CH:20][C:21]([C:34]3[CH:41]=[CH:40][C:39]([Cl:42])=[CH:38][C:35]=3[C:36]#[N:37])=[CH:22][CH:23]=2)=[CH:16][N:17]=1)=[O:7])([CH3:4])([CH3:3])[CH3:2]

Participants

6

Reactant 3

HCID 11430Potassium CarbonateHCID 103309442-Bromo-5-chlorobenzonitrileHCID 574497592-{4-[4-(4,4,5,5-Tetramethyl[1,3,2]dioxaborolan-2-yl)phenyl]-1h-imidazol-2-yl}pyrrolidine-1-carboxylic acid tert-butyl ester

Product 1

HCID 666210052-[5-(4'-Chloro-2'-cyano-biphenyl-4-yl)-1H-imidazol-2-yl]-pyrrolidine-1-carboxylic acid tert-butyl esterYield 81%

Reagents, catalysts & solvents 2

HCID 178418397HCID 178418397, compoundCatalystHCID 516892Sodium BicarbonateSolvent

Conditions

Temperature
85 °C

Procedure

2-{5-[4-(4,4,5,5-Tetramethyl-[1,3,2]dioxaborolan-2-yl)-phenyl]-1H-imidazol-2-yl}-pyrrolidine-1-carboxylic acid tert-butyl ester (2 g, 4.55 mmol), 2-Bromo-5-chloro-benzonitrile (985 mg, 4.55 mmol), Pd(PPh3)4 (263 mg, 0.228 mmol) and a 2 M aqueous solution of potassium carbonate (4.6 mL, 9.2 mmol) were suspended in 1,2-methoxyethane (20 mL) and degassed for 10 min. The stirred reaction mixture was heated to 85° C. for 21 hours then poured into a saturated aqueous solution of NaHCO3 (250 mL). The aqueous phase was extracted 3 times with ethyl acetate and the combined organic layers were dried over magnesium sulfate and concentrated. The crude residue was purified by silica column chromatography (65% to 90% EtOAc/hexanes) to afford 2-[5-(4′-Chloro-2′-cyano-biphenyl-4-yl)-1H-imidazol-2-yl]-pyrrolidine-1-carboxylic acid tert-butyl ester (1.65 g, 81%).

Workup

  1. customdegassed for 10 min
  2. customThe stirred reaction mixture
  3. extractionThe aqueous phase was extracted 3 times with ethyl acetate
  4. dry with materialthe combined organic layers were dried over magnesium sulfate
  5. concentrationconcentrated
  6. customThe crude residue was purified by silica column chromatography (65% to 90% EtOAc/hexanes)

Sources & evidence

ORD record
ord-0577ed72190848cd8a5ac27365ef6462
Source dataset
uspto-grants-2014_09
Patent number
US08841278B2

Reaction notes

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