1,4-Dibromobenzene → (1-{2-[5-(4-bromo-phenylethynyl)-1H-imidazol-2-yl]-pyrrolidine-1-carbonyl}-2-methyl-propyl)-carbamic acid methyl ester

HRID 2392372Notes

Reaction equation

HRID 2392372 reaction equation
[CH3:1][O:2][C:3](=[O:23])[NH:4][CH:5]([C:9]([N:11]1[CH2:15][CH2:14][CH2:13][CH:12]1[C:16]1[NH:17][C:18]([C:21]#[CH:22])=[CH:19][N:20]=1)=[O:10])[CH:6]([CH3:8])[CH3:7].[Br:24][C:25]1[CH:30]=[CH:29][C:28](Br)=[CH:27][CH:26]=1.C(N(CC)CC)C>CN(C=O)C.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.[Cu]I>[CH3:1][O:2][C:3](=[O:23])[NH:4][CH:5]([C:9]([N:11]1[CH2:15][CH2:14][CH2:13][CH:12]1[C:16]1[NH:17][C:18]([C:21]#[C:22][C:28]2[CH:29]=[CH:30][C:25]([Br:24])=[CH:26][CH:27]=2)=[CH:19][N:20]=1)=[O:10])[CH:6]([CH3:8])[CH3:7]

Participants

7

Reactant 3

HCID 78041,4-DibromobenzeneHCID 8471TriethylamineHCID 76818854{1-[2-(5-Ethynyl-1H-imidazol-2-yl)-pyrrolidine-1-carbonyl]-2-methyl-propyl}-carbamic acid methyl ester

Product 1

HCID 66620637(1-{2-[5-(4-bromo-phenylethynyl)-1H-imidazol-2-yl]-pyrrolidine-1-carbonyl}-2-methyl-propyl)-carbamic acid methyl esterYield 51%

Reagents, catalysts & solvents 3

HCID 24350Copper(1+) iodide; Copper(I) iodide; Cuprous iodide; Cuprous iodide (CuI)CatalystHCID 178418397HCID 178418397, compoundCatalystHCID 6228DimethylformamideSolvent

Conditions

Temperature
80 °C

Procedure

{1-[2-(5-Ethynyl-1H-imidazol-2-yl)-pyrrolidine-1-carbonyl]-2-methyl-propyl}-carbamic acid methyl ester (57 mg, 0.179 mmol), 1,4-dibromobenzene (211 mg, 0.895 mmol), Pd(PPh3)4 (10 mg, 0.00895 mmol), CuI (3 mg, 0.0179 mmol) and triethylamine (0.249 mL, 1.79 mmol) were suspended in DMF (2 mL) and the mixture was degassed for 10 min with nitrogen. The reaction mixture was stirred at 80° C. for 70 min then diluted with 20 mL ethyl acetate and washed with saturated aqueous sodium bicarbonate and brine. The organic phase was dried with magnesium sulfate and concentrated. The crude residue was purified by silica column chromatography (0% to 5% MeOH/DCM) to afford (1-{2-[5-(4-Bromo-phenylethynyl)-1H-imidazol-2-yl]-pyrrolidine-1-carbonyl}-2-methyl-propyl)-carbamic acid methyl ester (43 mg, 51%). (1-{2-[5-(4-{2-[1-(2-Methoxycarbonylamino-3-methyl-butyryl)-pyrrolidin-2-yl]-3H-imidazol-4-ylethynyl}-phenylethynyl)-1H-imidazol-2-yl]-pyrrolidine-1-carbonyl}-2-methyl-propyl)-carbamic acid methyl ester: {1-[2-(5-Ethynyl-1H-imidazol-2-yl)-pyrrolidine-1-carbonyl]-2-methyl-propyl}-carbamic acid methyl ester (49 mg, 0.154 mmol), (1-{2-[5-(4-bromo-phenylethynyl)-1H-imidazol-2-yl]-pyrrolidine-1-carbonyl}-2-methyl-propyl)-carbamic acid methyl ester (43 mg, 0.0908 mmol), Pd(PPh3)4 (10 mg, 0.00908 mmol), CuI (2 mg, 0.00908 mmol) and triethylamine (0.127 mL, 0.908 mmol) were suspended in DMF (2 mL) and the mixture was degassed for 10 min with nitrogen. The reaction mixture was stirred at 80° C. for 4 hours then cooled to RT. Formic acid (0.1 mL) and water (1 mL) were added and the mixture was purified by reverse phase preparative HPLC, giving (1-{2-[5-(4-{2-[1-(2-Methoxycarbonylamino-3-methyl-butyryl)-pyrrolidin-2-yl]-3H-imidazol-4-ylethynyl}-phenylethynyl)-1H-imidazol-2-yl]-pyrrolidine-1-carbonyl}-2-methyl-propyl)-carbamic acid methyl ester (11 mg, 17%). 1H NMR (MeOH-d4, 400 MHz) 7.46 (d, J=3.9 Hz, 4H), 7.25 (s, 2H), 6.96 (d, J=8.4 Hz, 2H), 5.10 (m, 2H), 4.20 (m, 2H), 3.97 (m, 2H), 3.83 (m, 2H), 3.64 (s, 6H), 2.32-2.00 (m, 10H), 0.98-0.88 (m, 12H); MS (ESI) m/z 711 [M+H]+.

Workup

  1. customthe mixture was degassed for 10 min with nitrogen
  2. additionthen diluted with 20 mL ethyl acetate
  3. washwashed with saturated aqueous sodium bicarbonate and brine
  4. dry with materialThe organic phase was dried with magnesium sulfate
  5. concentrationconcentrated
  6. customThe crude residue was purified by silica column chromatography (0% to 5% MeOH/DCM)

Sources & evidence

ORD record
ord-c9d20d6cacf04cc296df73445dd9f665
Source dataset
uspto-grants-2012_09
Patent number
US08273341B2

Reaction notes

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