To a stirred solution of 0.9 g (2.2 mmol) {4-[2-(benzyloxy)ethoxy]-3-tert-butoxyphenyl}methanol and 976 mg (2.94 mmol) tetrabromo methane in 9 ml THF was added 775 mg (2.96 mmol) triphenylphosphin diluted in 4.5 ml THF at 0° C. dropwisly. The reaction mixture was stirred for 1 h at 0° C. The suspension was filtrated. The filter cake was washed with THF. The combined filtrates were concentrated in vacua. The crude product is purified by column chromatography (silica gel, hexane/ethylacetate gradient: 99:1→1:99). The desired product was obtained in 28% yield (313 mg, 0.76 mmol).
