Chlorodifluoromethyl ketones reacted with diazomethane to afford epoxides in high yield; upon treatment with butyllithium, the epoxides underwent efficient ring opening to afford 3,3-difluoro-2-alkyl-alken-1-ols, suitable substrates for sigmatropic rearrangement leading to compounds containing a CF2 group in mid-chain.
氯二
氟甲基酮与
重氮甲烷反应生成的
环氧化物收率很高;用丁基
锂处理后,
环氧化物发生高效开环,生成 3,3-二
氟-2-烷基-烯-1-醇,这是进行西格玛重排的合适底物,可生成在链中间含有
CF2 基团的化合物。