Cobalt-Catalyzed Carbon-Carbon Bond Formation: Synthesis and Applications of Enantiopure Pyrrolidine Derivatives[1]
作者:Shih-Fan Hsu、Chih-Wei Ko、Yao-Ting Wu
DOI:10.1002/adsc.201100220
日期:2011.7
yields). The scope and limitations of this protocol were examined. The stereochemistry of the pyrrolidines was unaffected by the reaction conditions. The coupling products are important building blocks of phenanthroindolizidine alkaloids. Palladium‐catalyzed formal [4+2] cycloaddition of 2,2′‐diiodobiphenyl with the thus‐generated (S)‐2‐(3‐trimethylsilyl‐2‐propynyl)pyrrolidine gave a good yield of the desilylated
在钴催化剂和四甲基乙二胺(TMEDA)的存在下,(S)-2-(碘甲基)吡咯烷中的碘原子被相应的格氏试剂中的芳基或炔基取代,得到的偶联产物的质量好于优异的产量(16例; 75-94%的产量)。检查了该协议的范围和局限性。吡咯烷的立体化学不受反应条件的影响。偶联产物是菲咯啉吲哚并立生物碱的重要组成部分。钯催化的2,2'-二碘联苯与这样生成的(S)-2-(3-三甲基甲硅烷基-2-丙炔基)吡咯烷的正式[4 + 2]环加成反应得到的甲硅烷基化菲的收率很高,然后转换为非自然(+)‐(SPictet-Spengler环化产生的酪氨酸)。