I[C:2]1[CH:7]=[CH:6][C:5]([O:8][CH3:9])=[CH:4][CH:3]=1.[I-].[CH2:11]([OH:16])[CH2:12][CH2:13][C:14]#[CH:15]>C(NCC)C.[Pd](Cl)Cl.C1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1>[CH3:9][O:8][C:5]1[CH:6]=[CH:7][C:2]([C:15]#[C:14][CH2:13][CH2:12][CH2:11][OH:16])=[CH:3][CH:4]=1
4-Iodoanisol (10 g, 42 mmol), palladium (II) chloride (0.2 g, 1.1 mmol) and triphenylphosphine (0.6 g, 2.2 mmol) were dissolved in diethylamine (100 mL) then cupper(I) iodide (0.5 g, 2.2 mmol) and 4-pentyn-1-ol (5 mL, 53 mmol) were added. The reaction mixture was stirred overnight at room temperature, then the solvent was removed under reduced pressure. Ethyl acetate (150 mL) was added to the residue and the mixture was washed with 2N HCl, brine and water. The organic fraction was isolated, dried with sodium sulfate and the solvent was removed under reduced pressure. The product 16 (7.1 g. 87%) was isolated by flash chromatography (silica gel, 1:2 ethyl acetate/hexanes) as an oily yellow solid. 1H NMR (300 MHz, CDCl3) δ1.88 (m, 2H), 2.53 (m, 2H), 3.72 (s, 3H), 3.74 (m, 2H), 6.83 (d, 2H), 7.45 (d, 2H).
読み込み中…
