Synthesis of Bicyclic p-Diiodobenzenes via Silver-Catalyzed Csp-H Iodination and Ruthenium-Catalyzed Cycloaddition
摘要:
Highly substituted iodobenzenes were efficiently and regioselectively synthesized from readily available 1,6-diynes via two-step process consisting of silver-catalyzed Csp-H iodination and subsequent ruthenium-catalyzed [2+2+2] cycloaddition of resultant iododiynes. Some of the obtained iodobenzenes were subjected to palladium-catalyzed C-C bond-forming reactions such as Mizoroki-Heck reaction, Sonogashira reaction, and Suzuki-Miyaura coupling, giving highly conjugated molecules.
Synthesis of multiply functionalized benzenes via ruthenium-catalyzed cycloaddition of diiododiynes
作者:Yoshihiko Yamamoto、Kozo Hattori
DOI:10.1016/j.tet.2007.09.086
日期:2008.1
Highly functionalized benzenes were precisely synthesized via multi-step processes consisting of ruthenium-catalyzed [2+2+2] cycloaddition of diiododiynes with an ethynylboronate or terminal alkynes, and subsequent chemo- and regio-selective palladium-catalyzed C-C bond-forming reactions of the resulting cycloadducts. The sequential cycloaddition/coupling process was applied to the synthesis of oligo(p-phenylene ethynylene)s. (c) 2007 Elsevier Ltd. All rights reserved.