New expedient route to the stereoselective synthesis of fluorinated 1,3-diol derivatives via aluminum acetals derived from β-alkoxy esters and DIBAL
作者:Takashi Ishihara、Atsuya Takahashi、Hidetoshi Hayashi、Hiroki Yamanaka、Toshio Kubota
DOI:10.1016/s0040-4039(98)00879-x
日期:1998.6
On treating the aluminum acetal intermediates, generated in situ from ethyl 3-benzyloxy-2,2-difluoroalkanoates or 3-benzyloxy-4,4,4-trifluorobutanoate and diisobutylaluminum hydride at −78 °C for 1 h, with allylic stannanes in the presence of titanium(IV) dichloride diisopropoxide at 0 °C for 8 h or at −30 °C for 6 h, the corresponding allvlated products, polyfluoro-1,3-diol derivatives, were obtained
在处理乙缩醛铝中间体时,在3-78°C下将3-苄氧基-2,2-二氟链烷酸乙酯或3-苄氧基-4,4,4-三氟丁酸乙酯和氢化二异丁基铝原位生成1 h,在0°C下持续8 h或在-30°C下6 h存在二氯化钛(IV)二异丙醇盐时,可以高收率获得相应的烯丙基化产物多氟-1,3-二醇衍生物,且具有高抗立体选择性。