反应详情

温度

100 °C

A solution of 558 mg (1.35 mmol) of methyl 3-[2,4-dimethoxy-5-(1,3-dithian-2-yl)phenyl]octanoate [prepared as described in step (i) above], 1.576 g (5.42 mmol) of tributyltin hydride and 15 mg of azobis(isobutyronitrile) in 20 ml of toluene was stirred whilst heating at 100° C. for 6.5 hours. At the end of this time, the reaction temperature was allowed to reduce to room temperature, and the reaction mixture was purified by column chromatography through 15 g of silica gel, using a gradient elution method, with mixtures of hexane and ethyl acetate ranging from 6:0 to 6:1 by volume as the eluent, to give a mixture containing the reduced product. The mixture was further purified by column chromatography through 30 g of alumina, using a gradient elution method, with mixtures of hexane and ethyl acetate ranging from 20:0 to 20:1 by volume as the eluent, to give 385 mg (yield 92%) of methyl 3-(2,4-dimethoxy-5-methylphenyl)octanoate as an oily substance.

1. customto reduce to room temperature
2. customthe reaction mixture was purified by column chromatography through 15 g of silica gel
3. washa gradient elution method
4. customwith mixtures of hexane and ethyl acetate ranging from 6:0 to 6:1 by volume as the eluent, to give a mixture
5. additioncontaining the reduced product
6. customThe mixture was further purified by column chromatography through 30 g of alumina
7. washa gradient elution method