Triethylamine → 2-[6-(4-Iodo-phenylethynyl)-1H-benzoimidazol-2-yl]-pyrrolidine-1-carboxylic acid tert-butyl ester

HRID 71772

Reaction equation

HRID 71772 reaction equation
[C:1]([O:5][C:6]([N:8]1[CH2:12][CH2:11][CH2:10][CH:9]1[C:13]1[NH:17][C:16]2[CH:18]=[C:19]([C:22]#[CH:23])[CH:20]=[CH:21][C:15]=2[N:14]=1)=[O:7])([CH3:4])([CH3:3])[CH3:2].[I:24][C:25]1[CH:30]=[CH:29][C:28](I)=[CH:27][CH:26]=1.C(N(CC)CC)C>CN(C=O)C.C(OCC)(=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>[C:1]([O:5][C:6]([N:8]1[CH2:12][CH2:11][CH2:10][CH:9]1[C:13]1[NH:17][C:16]2[CH:18]=[C:19]([C:22]#[C:23][C:28]3[CH:29]=[CH:30][C:25]([I:24])=[CH:26][CH:27]=3)[CH:20]=[CH:21][C:15]=2[N:14]=1)=[O:7])([CH3:4])([CH3:3])[CH3:2]

Participants

8

Reactant 3

HCID 8471TriethylamineHCID 12208p-DiiodobenzeneHCID 722403932-(6-ethynyl-1H-benzoimidazol-2-yl)-pyrrolidine-1-carboxylic acid tert-butyl ester

Product 1

HCID 666206442-[6-(4-Iodo-phenylethynyl)-1H-benzoimidazol-2-yl]-pyrrolidine-1-carboxylic acid tert-butyl esterYield 75%

Reagents, catalysts & solvents 4

HCID 24350Copper(1+) iodide; Copper(I) iodide; Cuprous iodide; Cuprous iodide (CuI)CatalystHCID 178418397HCID 178418397, compoundCatalystHCID 6228DimethylformamideSolventHCID 8857Ethyl AcetateSolvent

Conditions

Temperature
100 °C

Procedure

A mixture of 2-(6-ethynyl-1H-benzoimidazol-2-yl)-pyrrolidine-1-carboxylic acid tert-butyl ester (100 mg, 0.321 mmol), 1,4-Diiodo-benzene (529 mg, 1.61 mmol), tetrakis(triphenylphosphine)palladium (37 mg, 0.03 mmol), copper(I) iodide (12 mg, 0.06 mmol) and triethylamine (0.135 mL, 0.96 mmol) in 2 ml DMF was heated to 100° C. in the microwave for 1 hour. The reaction mixture was cooled and dissolved in ethyl acetate and washed with 5% lithium chloride aqueous solution. The organic layer was dried (MgSO4), concentrated and purified by flash column chromatography (silica gel, 20 to 100% ethyl acetate/hexane) to give 2-[6-(4-Iodo-phenylethynyl)-1H-benzoimidazol-2-yl]-pyrrolidine-1-carboxylic acid tert-butyl ester (123 mg, yield 75%). LCMS-ESI−: calc'd for C24H24IN3O2: 513.37. Found: 531.8 (M+H+).

Workup

  1. temperatureThe reaction mixture was cooled
  2. washwashed with 5% lithium chloride aqueous solution
  3. dry with materialThe organic layer was dried (MgSO4)
  4. concentrationconcentrated
  5. custompurified by flash column chromatography (silica gel, 20 to 100% ethyl acetate/hexane)

Sources & evidence

ORD record
ord-9a35d87c98eb47238e62f5a5a87e6df0
Source dataset
uspto-grants-2014_09
Patent number
US08822430B2

Linked notes

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