作者:Werner Fudickar、Katja Vorndran、Torsten Linker
DOI:10.1016/j.tet.2006.07.104
日期:2006.11
The photooxygenation of homochiral cyclohexene ketals, which are easily available from 2-cyclohexenone and l-tartrates, affords hydroperoxides and after reduction the corresponding allylic alcohols in good yields and high regioselectivities. This can be rationalized by electronic repulsions in a perepoxide intermediate and provides evidence for unfavorable 1,3 diaxial interactions with a dioxolane
可以容易地从2-环己烯酮和L-酒石酸酯获得的高手性环己烯缩酮的光氧化作用提供了氢过氧化物,并且在还原后相应的烯丙基醇具有良好的收率和高的区域选择性。可以通过在过氧化物中间体中进行电子排斥来使其合理化,并提供与二氧戊环氧原子发生不利的1,3双轴相互作用的证据。由于环己烯环的柔性,仅观察到低的立体选择性。然而,可以分离非对映异构体,并且在裂解辅助物后,以对映体纯形式分离4-羟基-2-环己烯-1-酮,其可以用作天然产物合成的基础。