Generality and mechanism of homobenzylic-homoallylic hydrogenolysis of 5-aryl-4,5-dihydro-1,3-dioxepins
作者:Kiyohiro Samizu、Kunio Ogasawara
DOI:10.1016/0040-4039(94)80030-8
日期:1994.10
Birch reduction of several 5-aryl-4,5-dihydro-1,3-dioxepins gave rise to 3-arylbutanal in moderate to good yields by hydrogenolytic cleavage of the homobenzylic-homoallylic carbonoxygen bond when the benzylic-allylic carbon is tertiary. However, the reaction did not take place when the benzylic-allylic carbon is quaternary. Moreover, the reaction was found to proceed with complete racemization at
当苄基-烯丙基碳为叔碳时,通过氢解裂解均苄基-均烯丙基碳-氧键,桦木还原几种5-芳基-4,5-二氢-1,3-二氧杂环丁烷可以中等至良好的收率得到3-芳基丁醛。 。但是,当苄基烯丙基碳为季铵盐时,该反应没有发生。此外,发现该反应在苄基烯丙基中心完全消旋地进行,表明涉及同时发生的消除-还原途径。