Photoinduced Electron Transfer Reactions of α-Cyclopropyl- and α-Epoxy Ketones. Tandem Fragmentation−Cyclization to Bi-, Tri-, and Spirocyclic Ketones
作者:Thorsten Kirschberg、Jochen Mattay
DOI:10.1021/jo961015b
日期:1996.1.1
compounds, among them are silylated fragmentation products, indicating that a proton is transferred from not only the amine radical cation but also the cationic silyl group. The intramolecular Paternó-Büchi reaction has also been studied for cyclopropane derivatives of the jasmone type leading to tetracyclic oxetanes. Finally, alpha-epoxy-substituted ketones have been investigated under PET conditions, yielding
已经用各种双环α-环丙基取代的酮和叔胺进行了还原性光诱导电子转移(PET)反应。该反应导致具有环内烯醇酸酯单元的环外自由基形成下一个环丙基键的区域选择性切割。在具有不饱和侧链的双环酮的情况下,取决于烯基取代基的位置,可通过自由基环化获得各种双环,螺环和三环产物。除三乙胺外,N-甲硅烷基化胺还被用作电子给体,产生了多种化合物,其中有甲硅烷基化的裂解产物,这表明质子不仅从胺自由基阳离子而且从阳离子甲硅烷基基团转移。 。分子内的Paternó-Büchi反应也已被研究用于茉莉酮型环丙烷衍生物生成四环氧杂环丁烷的研究。最后,已经在PET条件下研究了α-环氧取代的酮,得到开环的产物。