Discovery of A Novel Palladium Catalyst for the Preparation of Enynes with a Copper- and Ligand-Free Sonogashira Reaction
作者:Mengmeng Huang、Yangjie Wu、Xia Mi、Yujian Feng
DOI:10.1055/s-0031-1290938
日期:2012.5
catalytic systems are tolerant in the presence of a broad variety of functional groups in the substrates. The catalytic system was found to be ineffective for vinylchloride. Moreover, it was found that (Z)-β-bromostyrene reacts with terminalalkynes with retention of the steric configuration and the transformation of most of the Z-isomer did not occur in this reaction.
基于 N,N-二甲基乙醇胺 (SP-4-1')-双 [N,N-二甲基氨基乙氧基-kN,O] 钯 (II) 的新型钯 (II) 配合物与两摩尔的 AcOH 配位,已被合成的。通过 X 射线衍射分析确定了配合物的结构。使用这种配合物作为催化剂,在没有助催化剂 CuX 和任何配体的情况下,在室温下 20 小时内,通过 Sonogashira 交叉偶联反应成功合成了一系列共轭烯炔,以中等至优异的产率得到相应的产物。优化的催化系统可以耐受底物中存在多种官能团。发现该催化体系对氯乙烯无效。而且,
Cycloaddition von phenylarsinen an pentadiin-1,4-one-3 und 3-methylenpentadiine-1,4
作者:G. Märkl、H. Hauptmann
DOI:10.1016/0040-4020(76)85123-x
日期:1976.1
The radicalic cycloaddition of phenylarsine and trimethylsilylsubstituted phenylarsines to pentadiyn-1,4-ones-3 yields the 2-methylene-arsolene-4-ones-3; these ketones react with diphenylketene to give the substituted 2,3-bis-methylene-arsolenes-4, which undergo thermal electrocyclic reactions. The resulting benzannelated arsolenes are dehydrogenated to the corresponding arsoles, which can be isolated
Zirconocene-promoted coupling reaction of terminal acetylenes to geminal enediynes in the presence of p-chloranil
作者:Chanjuan Xi、Yuanyuan Liu、Xiaoyu Yan、Chao Chen
DOI:10.1016/j.jorganchem.2007.04.028
日期:2007.10
Reaction of alkynyllithium with zirconocene dichloride in the presence of quinones afforded zirconoenediynes in good yields. Treatment of the zirconoenediyne with p-chloranil in the presence of CuCl afforded 1,1,4,4-tetraethynyl-1,3-diene in good yield. In the presence of CuCl and/or Pd(PPh3)4, the zirconoenediynes could be transformed into various enediyne derivatives through couplingreaction with