Even highly sterically hindered organosilicon compounds containing the bulky tert-butyldiphenylsilyl group can be oxidatively cleaved to the corresponding carbinols using a modified protocol of the original Fleming-Tamao oxidation that generates the intermediate tert-butyldifluorosilyl derivatives. This novel application emphasizes the utility of allyl-tert-butyldiphenylsilane as a building block for the stereoselective synthesis of either hydroxycyclopentanes or hydroxymethylcyclobutanes via the sequence titanium tetrachloride-promoted cycloaddition and oxidative cleavage.
即使高度立体阻碍的
有机硅化合物含有笨重的叔丁基二苯基
硅基,也可以使用改良的原始弗莱明-塔茂氧化方案氧化裂解为相应的羟基化合物,生成中间产物叔丁基二
氟硅基衍
生物。这种新颖的应用强调了烯丙基叔丁基二苯基
硅烷作为立体选择性合成羟基
环戊烷或羟甲基
环丁烷的构建模块的实用性,其通过
四氯化钛促进的环加成和氧化裂解反应进行。