Diethylene glycol vinyl ether → 2-[1-[(4-Chlorophenyl)sulfonyl]-3-(2-vinyloxyethoxy)propyl]-1,4-difluorobenzene

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In toluene (30 ml) was dissolved the 2-[(4-chlorophenyl)sulfonylmethyl]-1,4-difluorobenzene (520 mg, 1.72 mmol) obtained in Example 5. After addition of 2,2-(2-vinyloxyethoxy)ethanol (0.270 ml, 2.10 mmol) and cyanomethylenetri-n-butylphosphorane (500 mg, 2.07 mmol), the mixture was heated under reflux for 24 hours under an argon atmosphere. The reaction mixture was then allowed to cool down. After addition of 2-(2-vinyloxyethoxy)-ethanol (0.170 ml, 1.25 mmol) and cyanomethylenetri-n-butylphosphorane (300 mg, 1.24 mmol), the mixture was heated under reflux for 12 hours under an argon atmosphere. The reaction mixture was allowed to cool down and then concentrated under reduced pressure. The residue thus obtained was purified by silica gel chromatography (hexane:ethyl acetate=7:1) to yield a white solid. The resulting white solid was washed with hexane, whereby the title compound (140 mg, 20%) was obtained as a white powder.

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