Stereoselective Epoxidation of Allylic Alcohols and Dehydrogenative Oxidation of Secondary Alcohols by Means of<i>t</i>-Butyl Hydroperoxide and Aluminium Reagents
作者:Kazuhiko Takai、Koichiro Oshima、Hitosi Nozaki
DOI:10.1246/bcsj.56.3791
日期:1983.12
of a solution of geraniol and (t-BuO)3Al in benzene with t-BuOOH at 5 °C gives (2R*, 3R*)-2,3-epoxy-3,7-dimethyl-6-octenyl acetate in 83% yield after acetylative workup. Eight allylic alcohols are converted to α,β-epoxy alcohols in preparative yields. The epoxidation of secondary (E)-allylic alcohols shows opposite stereoselectivities to t-BuOOH–VO(acac)2 system. Asymmetric epoxidation with a chiral
在 5 °C 下用 t-BuOOH 处理香叶醇和 (t-BuO)3Al 在苯中的溶液,得到 (2R*, 3R*)-2,3-epoxy-3,7-dimethyl-6-octenyl acetate in 83乙酰化处理后的 % 产率。八种烯丙醇以制备产率转化为α,β-环氧醇。仲 (E)-烯丙醇的环氧化显示出与 t-BuOOH-VO(acac)2 系统相反的立体选择性。用手性异羟肟酸作为配体的不对称环氧化产生不令人满意的对映体过量程度。同样的系统也可以将仲醇以极好的收率转化为酮,而伯醇反应非常缓慢。