Rhodium-Catalyzed Pauson-Khand-Type Reaction Using Alcohol as a Source of Carbon Monoxide
作者:Ji Hoon Park、Yoonhee Cho、Young Keun Chung
DOI:10.1002/anie.201001246
日期:2010.7.12
cyclopentenones have been synthesized from enynes in alcohol in the presence of a rhodium catalyst through a newly developed auto‐tandem catalytic reaction. This process combines three mechanistically distinctive reactions—an oxidation of alcohols, a decarbonylation of aldehydes, and a carbonylative [2+2+1] cycloaddition (see scheme; dppp=propane‐l,3‐diylbis(diphenylphosphane)).
Tandem Gold/Silver-Catalyzed Cycloaddition/Hydroarylation of 7-Aryl-1,6-enynes to Form 6,6-Diarylbicyclo[3.2.0]heptanes
作者:Bradley D. Robertson、Rachel E. M. Brooner、Ross A. Widenhoefer
DOI:10.1002/chem.201500371
日期:2015.4.7
[PCy2(o‐biphenyl)}AuCl] and AgSbF6 catalyze the tandemcycloaddition/hydroarylation of 7‐aryl‐1,6‐enynes with electron‐rich arenes to form 6,6‐diarylbicyclo[3.2.0]heptanes in good yield under mild conditions. Experimental observations point to a mechanism involving gold‐catalyzed cycloaddition followed by silver‐catalyzed hydroarylation of a bicyclo[3.2.0]hept‐1(7)‐ene intermediate.
Cobalt-Catalyzed Hydrosilylation/Cyclization of 1,6-Enynes
作者:Tuo Xi、Zhan Lu
DOI:10.1021/acs.joc.6b01555
日期:2016.10.7
An iminopyridine cobalt dichloride complex was synthesized and demonstrated as an effective precatalyst for hydrosilylation/cyclization of 1,6-enynes with silanes. Various functional groups such as amine, free aniline, ester, ether, cyano, halide, trifluoromethyl, and heterocycle were tolerated to afford a variety of silicon-containing compounds. The reaction could be scaled up to afford products on
the substituents on the aromatic ring also affects the ratio of type I and type II. The nature of a tether also has a significant effect on the course of the reaction. Experimental evidence for the intermediacy of a cyclopropyl rhodium carbenoid, a key intermediate in the skeletal reorganization of enynes, is also reported. In addition to the skeletal reorganization of enynes, Rh(II) complexes were
报道了使用 Rh(II) 作为催化剂的 1,6- 和 1,7- 烯炔的骨架重组导致 1-乙烯基环烯烃。可以获得两种可能的 1-乙烯基环烯烃异构体,I 型和 II 型,它们的比例高度依赖于所用烯炔的取代模式。I 型化合物的形成涉及 CC 双键的单次断裂,其产物与烯炔复分解的产物相同。相比之下,II 型化合物的形成涉及 CC 双键和三键的双裂解,其具有异常的键连接。炔烃碳上的苯基和内部烯烃碳上的甲基的存在促进了 II 型化合物的形成。芳环上取代基的电子和空间性质也影响 I 型和 II 型的比例。系绳的性质也对反应过程有显着影响。还报告了环丙基铑卡宾(烯炔骨架重组的关键中间体)作为中间体的实验证据。除了烯炔的骨架重组外,Rh(II) 配合物还被发现对炔衍生物的一些环化异构化反应具有很高的催化活性,包括烯炔双环化为双环[4.1.0]庚烯衍生物和炔基呋喃环化为苯酚衍生物。还报道了烯炔骨架重组的关键中