Propargyl bromide → 1,2,4-Trichlorophenyl-3-(2-propynyloxy) benzene

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Reaction Conditions

Reaction Steps

1,2,4-trichlorophenyl-3-(2-propynyloxy) benzene (TCPB) and 1-(2-propynyloxy)methylenedioxyphenyl ether (MDPPE) were synthesized by the method of F. Albericio et al., "Preparation and Application of the 5-(4-(9-Fluorenylmethyloxy carbonyl)-Aminomethyl-3,5-Dimethoxyphenoxy)-Valeric Acid Handle for the Solid Phase Synthesis of C-Terminal Peptide Amides under Mild Conditions," J. Org. Chem. vol. 55, pp. 3730-3743 (1990) (FIG. 2). A mixture of 2,3,6-trichlorophenol or methylenedioxyphenol (0.05 mole), potassium tert-butoxide (6.16 g, 0.055 mole), propargyl bromide (6.6 g, 0.055 mole) in dry DMF (60 mL) was heated and stirred at 110° C. for 5 h, after which the solvent was removed under high vacuum. Ethyl acetate was added, the inorganic salts were removed by filtration, and the organic extract was washed sequentially with water, 2 M NaOH, and saturated aqueous NaCl. The organic phase was dried overnight (Na2SO4) to give a crude product. MDPPE, a liquid product, was purified by silica gel chromatography using hexane-ethyl acetate (7:3) as the eluting solvent. Yield: 6.5 g (74%). 1H NMR (CDCl3): d 2.54 (t, 1H, CH), 4.61 (d, 2H, --OCH2 --), 5.92 (s, 2H, --OCH2O--), 6.38-6.73 (m, 3H, aromatics). GC-MS (m/z): M+· =176.

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