N,N-Dimethylpropargylamine → methyl (E)-[2-methyl-4-[3-(2-methylbenzo[b]furan-5-yl)-3-[4-[3-(dimethylamino)propynyl]phenyl]-allyloxy]phenoxy]acetate

Participants

Reaction Conditions

Reaction Steps

Under nitrogen atmosphere, 3-(N,N-dimethylamino)propyne (250 mg, 3.00 mmol) was added to a degassed solution of methyl (Z)-[4-[3-(4-iodophenyl)-3-(2-methylbenzo[b]-furan-5-yl)allyloxy]-2-methylphenoxy]acetate (370 mg, 0.63 mmol; prepared as described in example 25) in a mixture of tetrahydrofuran (6 mL) and triethylamine (6 mL) The solution was cooled to 0° C., tetrakis(triphenylphosphine)palladium (71 mg, 0.06 mmol) and copper(I) iodide (21 mg, 0.11 mmol) were added. The reaction mixture was stirred at ambient temperature for 72 h, diluted with benzene (100 mL), decanted and evaporated in vacuo. The residue was purified by column chromatography (silica gel Fluka 60, benzene/ethyl acetate 1:0-0:1) yielding methyl (E)-[2-methyl-4-[3-(2-methylbenzo[b]furan-5-yl)-3-[4-[3-(dimethylamino)-propynyl]phenyl]-allyloxy]phenoxy]acetate.

Provenance & Evidence