Synthesis of cyclopropyl silyl ethers and their facile ring opening by photoinduced electron transfer as key step in radical/radical cationic cascade reactions
作者:Prashant A. Waske、Jochen Mattay
DOI:10.1016/j.tet.2005.08.034
日期:2005.10
Various ring-fused cyclopropyl silyl ethers with an benzylic, olefinic or acetylenic side chain have been synthesized. Upon oxidative photoinduced electron transfer (PET) the cyclopropane ring opens and forms a reactive β-keto radical, which undergoes intramolecular cyclization. In some cases we observed only formation of ring opened non-cyclized products. With olefinic side chain 5-exo-trig mode of
已经合成了具有苄基,烯烃或炔属侧链的各种环稠合的环丙基甲硅烷基醚。氧化光诱导电子转移(PET)后,环丙烷环打开并形成反应性β-酮基,该基团经过分子内环化。在某些情况下,我们仅观察到开环的非环化产物的形成。用烯烃侧链发生5- exo - trig环化模式,而不是6- endo - trig环化模式,而在炔属侧链的情况下,我们观察到6- endo环化。