Cu(I)-Catalyzed Intramolecular C−C Coupling of Activated Methylene Compounds with Vinyl Halides: Efficient Synthesis of Functionalized Alkylidenecyclobutanes
作者:Liqun Chen、Min Shi、Chaozhong Li
DOI:10.1021/ol802012q
日期:2008.11.20
With the catalysis of CuI/L-proline, a number of 2-(3-bromobut-3-enyl)malonates underwent efficient intramolecularC-vinylation leading to the synthesis of functionalized alkylidenecyclobutanes. Competition experiments revealed that this four-membered ring closure is fundamentally preferred over the corresponding five-membered ring closure.