Stereoselective Synthesis of Highly Functionalized Cyclohexenes via Strong-Acid-Mediated Endocyclic C–C Bond Cleavage of Monocyclopropanated Cyclopentadienes
作者:Sebastian Fischer、Terrence-Thang H. Nguyen、Andreas Ratzenboeck、Huw M. L. Davies、Oliver Reiser
DOI:10.1021/acs.orglett.3c00935
日期:2023.6.23
A stereoselective, solvent- and metal-free endocyclic C–Cbondcleavage of monocyclopropanated cyclopentadienes mediated by strong acids was developed, leading to highly functionalized six-membered carbocycles with high stereocontrol. The critical step for this ring-expansion is the formation of a cyclopropyl carbocation that undergoes endocyclic ring opening via an SN2′-type attack of various nucleophiles
开发了一种由强酸介导的单环丙烷化环戊二烯的立体选择性、无溶剂和金属的环内 C-C 键断裂,产生具有高度立体控制的高度官能化的六元碳环。这种扩环的关键步骤是环丙基碳正离子的形成,环丙基碳正离子通过各种亲核试剂的 SN 2 ' 型攻击进行环内开环。随后的合成转化显示了所得环己烯对于合成具有非常规取代模式的新化合物的多功能性。