Trimethylsilylacetylene → [3-(2-Methoxy-1,1-dimethyl-ethyl)-phenylethynyl]-trimethyl-silane

HRID 2223403Notes

Reaction equation

HRID 2223403 reaction equation
Br[C:2]1[CH:7]=[CH:6][CH:5]=[C:4]([C:8]([CH3:13])([CH3:12])[CH2:9][O:10][CH3:11])[CH:3]=1.[CH3:14][Si:15]([C:18]#[CH:19])([CH3:17])[CH3:16]>CC#N.CCN(CC)CC.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>[CH3:11][O:10][CH2:9][C:8]([C:4]1[CH:3]=[C:2]([C:19]#[C:18][Si:15]([CH3:17])([CH3:16])[CH3:14])[CH:7]=[CH:6][CH:5]=1)([CH3:13])[CH3:12]

Participants

6

Reactant 2

HCID 66111TrimethylsilylacetyleneHCID 671914112-(3-Bromophenyl)-2-methylpropyl methyl ether

Product 1

HCID 67187907[3-(2-Methoxy-1,1-dimethyl-ethyl)-phenylethynyl]-trimethyl-silaneYield 89%

Reagents, catalysts & solvents 3

HCID 24350Copper(1+) iodide; Copper(I) iodide; Cuprous iodide; Cuprous iodide (CuI)CatalystHCID 178418476HCID 178418476, compoundCatalystHCID 21895542Acetonitrile triethylamineSolvent

Procedure

To a solution of 1-bromo-3-(2-methoxy-1,1-dimethyl-ethyl)-benzene (1.62 g, 6.69 mmol) and trimethylsilylacetylene (1.2 mL, 8.7 mmol, 1.3 eq.) in MeCN-Et3N (50 mL, 7:3) was added Pd(PPh3)2Cl2 (0.23 g, 0.33 mmol. 0.05 eq.), CuI (0.038 g, 0.2 mmol, 0.03 eq.) and the mixture refluxed for 16 h. After cooling to ambient temperature and concentration under reduced pressure the residue was chromatographed (EtOAc-hexane, 2:98) to obtain 1.54 g (89%) of the desired product. NMR (DMSO-d6): 7.28-7.00 (m, 4H), 3.16 (s, 2H), 2.98 (s, 3H), 1.00 (s, 6H), 0.1 (s, 9H). MS (DCI): 261 (M+1).

Workup

  1. temperaturethe mixture refluxed for 16 h
  2. concentrationconcentration under reduced pressure the residue
  3. customwas chromatographed (EtOAc-hexane, 2:98)

Sources & evidence

ORD record
ord-5769c9bba7e5498c88a42d9a99bb9ab8
Source dataset
uspto-grants-2008_05
Patent number
US07375126B2

Reaction notes

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