Conversion of 2-Iodobiaryls into 2,2′-Diiodobiaryls via Oxidation-Iodination Sequences: A Versatile Route to Ladder-Type Heterofluorenes
作者:Bin Wu、Naohiko Yoshikai
DOI:10.1002/anie.201503134
日期:2015.7.20
heterofluorenes and other extended π‐conjugated systems, their preparation still remains nontrivial when structural diversity of the biaryl backbone is required. Herein, we report a convenient method for the preparation of various 2,2′‐diiodobiaryls from 2‐iodobiaryls via cyclic diaryliodonium intermediates. An iodinative ring‐opening of the diaryliodonium salts, mediated by a copper/diamine catalyst
尽管2,2'-二碘代和2,2'-二溴代双芳基代表了杂芴和其他扩展的π-共轭体系的成功前体,但是当需要联芳基骨架的结构多样性时,它们的制备仍然很重要。在这里,我们报告了一种方便的方法,可以通过环二芳基碘鎓中间体从2-碘二联芳基制备各种2,2'-二碘联二芳基。在铜/二胺催化剂体系的介导下,二芳基碘鎓盐的碘化开环能够在温和的条件下提供相应的2,2'-二碘二联芳基。迄今未开发的四碘杂芳基化合物的制备及其转化为梯型π共轭体系证明了这种两步法的多功能性。