Gold-Catalyzed Cascade Cyclizations of 1,6-Diynyl Carbonates to Benzo[b]fluorenes Involving Arylation of Oxocarbenium Ion Intermediates and Decarboxylative Etherification
作者:Yifeng Chen、Ming Chen、Yuanhong Liu
DOI:10.1002/anie.201201799
日期:2012.6.25
cycloisomerizations give access to highly substituted benzo[b]fluorenes under mild reaction conditions (see scheme). Experimental results indicate that the in situ formed oxocarbenium ion intermediates, derived from gold‐catalyzed 3,3‐rearrangement and 6‐endo‐dig cyclization, undergo intramolecular arylation and subsequent decarboxylative etherification to furnish the final ether products.
重排:在温和的反应条件下,所描述的金催化的环异构化反应可得到高度取代的苯并[ b ]芴(参见方案)。实验结果表明,在原位形成oxocarbenium离子中间体,衍生自金催化3,3-重排和6-内-挖环化,分子内经历芳基化和随后的脱羧醚化,得到最终的醚产物。