Trimethylsilylacetylene → 1-(2-Methyl-4-trimethylsilanylethynyl-benzyl)-1H-imidazole

HRID 1936152Notes

Reaction equation

HRID 1936152 reaction equation
Br[C:2]1[CH:13]=[CH:12][C:5]([CH2:6][N:7]2[CH:11]=[CH:10][N:9]=[CH:8]2)=[C:4]([CH3:14])[CH:3]=1.[CH3:15][Si:16]([C:19]#[CH:20])([CH3:18])[CH3:17].CO.CCOC(C)=O>C(N(CC)CC)C.[Cu]I.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>[CH3:14][C:4]1[CH:3]=[C:2]([C:20]#[C:19][Si:16]([CH3:18])([CH3:17])[CH3:15])[CH:13]=[CH:12][C:5]=1[CH2:6][N:7]1[CH:11]=[CH:10][N:9]=[CH:8]1

Participants

7

Reactant 3

HCID 66111TrimethylsilylacetyleneHCID 21584119Ethylacetate methanolHCID 225688221-(4-Bromo-2-methyl-benzyl)-1H-imidazole2×

Product 1

HCID 225689641-(2-Methyl-4-trimethylsilanylethynyl-benzyl)-1H-imidazoleYield 82%

Reagents, catalysts & solvents 3

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

Conditions

Temperature
70 °C

Procedure

Using General Procedure D; 1-(4-bromo-2-methyl-benzyl)-1H-imidazole (Intermediate 139, 160.0 mg, 0.64 mmol) in triethylamine (8 mL) was treated with copper(I)iodide (12.0 mg, 0.07 mmol) and then sparged with argon for 5 minutes. Trimethylsilyl acetylene (0.70 g, 0.71 mmols) was then added followed by dichlorobis(triphenylphosphine)palladium(II) (45.0 mg, 0.07 mmol). The resulting reaction mixture was heated to 70° C. for 5 days. The title compound (140.0 mg, 82%) was isolated by chromatography (5% MeOH-EtOAc ) as an orange oil.

Workup

  1. customsparged with argon for 5 minutes
  2. customThe resulting reaction mixture

Sources & evidence

ORD record
ord-19626ce36eba416dae5d133b632b2f22
Source dataset
uspto-grants-2002_05
Patent number
US06387951B1

Reaction notes

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