Triphenylphosphine → methyl (Z)-[4-[3-(4-iodophenyl)-3-(2-methylbenzo[b]furan-5-yl)allyloxy]-2-methylphenoxy]acetate

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The above allyl alcohol (2.20 g, 5.64 mmol), methyl (4-hydroxy-2-methylphenoxy)acetate (1.20 g, 6.1 mmol; prepared as in example 2) and triphenylphosphine (1.70 g, 6.48 mmol) were dissolved in a mixture of anhydrous toluene (20 mL) and tetrahydrofuran (10 mL). The mixture was cooled to 0° C., kept under nitrogen and diisopropyl azodicarboxylate (1.50 g, 7.0 mmol) was added dropwise. The reaction mixture was stirred at 0° C. for 3 h and then at ambient temperature for 72 h. The solvents were evaporated in vacuo and the residue was submitted to column chromatography (silica gel Fluka 60, benzene) affording methyl (Z)-[4-[3-(4-iodophenyl)-3-(2-methylbenzo[b]furan-5-yl)allyloxy]-2-methylphenoxy]acetate as solid mass.

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