Acetonitrile → 4-(2,4-Dimethoxy-3-nitro-phenylethynyl)-1-methyl-1H-pyrazole

HRID 1042576Notes

Reaction equation

HRID 1042576 reaction equation
[CH3:1][O:2][C:3]1[C:8]([N+:9]([O-:11])=[O:10])=[C:7]([O:12][CH3:13])[CH:6]=[CH:5][C:4]=1I.[C:15]([C:17]1[CH:18]=[N:19][N:20]([CH3:22])[CH:21]=1)#[CH:16].C(#N)C>Cl[Pd](Cl)([P](C1C=CC=CC=1)(C1C=CC=CC=1)C1C=CC=CC=1)[P](C1C=CC=CC=1)(C1C=CC=CC=1)C1C=CC=CC=1.[Cu]I.C(N(CC)CC)C>[CH3:1][O:2][C:3]1[C:8]([N+:9]([O-:11])=[O:10])=[C:7]([O:12][CH3:13])[CH:6]=[CH:5][C:4]=1[C:16]#[C:15][C:17]1[CH:18]=[N:19][N:20]([CH3:22])[CH:21]=1

Participants

7

Reactant 3

HCID 6342AcetonitrileHCID 511383214-Ethynyl-1-methyl-1H-pyrazoleHCID 574219462,4-Dimethoxy-3-nitro-iodobenzene

Product 1

HCID 687741874-(2,4-Dimethoxy-3-nitro-phenylethynyl)-1-methyl-1H-pyrazoleYield 71%

Reagents, catalysts & solvents 3

HCID 24350Copper(1+) iodide; Copper(I) iodide; Cuprous iodide; Cuprous iodide (CuI)CatalystHCID 178418476HCID 178418476, compoundCatalystHCID 8471TriethylamineSolvent

Procedure

To a mixture of 2,4-dimethoxy-3-nitro-iodobenzene (0.95 mmol), 0.122 g (1.15 mmol) of 4-ethynyl-1-methyl-1H-pyrazole, 0.028 g (0.04 mmol) of dichlorobis(triphenylphosphine)palladium (II) and 8 mg (0.042 mmol) of copper (I) iodide 4 mL of anhydrous acetonitrile and 2 mL of triethylamine were added under nitrogen atmosphere at room temperature. The resulting mixture was stirred for 1 hour, when TLC indicated a consumption of the iodobenzene. The solvent was evaporated under reduced pressure and the residue purified by flash column chromatography (silica gel; dichloromethane:ethyl acetate 9:1) to give the title compound in 71% yield as creamy crystals. H1 NMR (CDCl3) 3.88 (s, 3H, Me); 3.9 (s, 3H, OMe); 4.07 (s, 3H, OMe); 6.7 (d, 1H, CH, J=8.9 Hz); 7.44 (d, 1H, CH, J=8.9 Hz); 7.56 (s, 1H, CH pyr); 7.62 (s, 1H, CH pyr).

Workup

  1. additionwere added under nitrogen atmosphere at room temperature
  2. customa consumption of the iodobenzene
  3. customThe solvent was evaporated under reduced pressure
  4. customthe residue purified by flash column chromatography (silica gel; dichloromethane:ethyl acetate 9:1)

Sources & evidence

ORD record
ord-e0f1c24a003941f29f0a64a778acece8
Source dataset
uspto-grants-2013_10
Patent number
US08557982B2

Reaction notes

Loading…