Synthesis of 9-Alkylidene-9<i>H</i>-fluorenes by a Novel, Palladium-Catalyzed Cascade Reaction of Aryl Halides and 1-Aryl-1-alkynes
作者:Richard C. Larock、Qingping Tian
DOI:10.1021/jo010561o
日期:2001.11.1
In the presence of a palladium catalyst and NaOAc, aryl iodides react with 1-aryl-1-alkynes to afford 9-alkylidene-9H-fluorenes in good yields. The products from this reaction are highly dependent on the base employed. This process appears to involve (1) oxidative addition of the aryl iodide to Pd(0), (2) alkyne insertion, (3) rearrangement of the resulting vinylic palladium intermediate to an arylpalladium
在钯催化剂和NaOAc的存在下,芳基碘化物与1-芳基-1-炔烃反应以高收率得到9-亚烷基-9H-芴。该反应的产物高度依赖于所用的碱。该过程似乎涉及(1)将芳基碘化物氧化加成至Pd(0),(2)炔烃插入,(3)将所得乙烯基钯中间体重排为芳基钯物质和(4)芳基-芳基与同时再生Pd(0)催化剂。与该机理一致的事实是,也可以通过Pd催化的1,1-二芳基-2-碘-1-烯烃的重排制备9-亚烷基-9H-芴。