Pauson–Khand Reactions in a Photochemical Flow Microreactor
摘要:
Pauson-Khand reactions were achieved at ambient temperature without any additive using a photochemical flow microreactor. The efficiency of the reaction was better than that in a conventional batch reactor, and the reaction could be operated continuously for 1 h.
The reaction of enynes with aldehydes in the presence of a catalytic amount of [RhCl(cod)](2)/dppp results in the Pauson-Khand-typereaction without the use of gaseous carbon monoxide to give bicyclic cyclopentenones in high yields (14 examples). Aldehydes serve as a source of carbon monoxide, and their carbonyl moiety is transferred to enynes, resulting in the formation of the carbonylated products
在催化量的 [RhCl(cod)](2)/dppp 存在下,烯炔与醛的反应会导致 Pauson-Khand 型反应,而无需使用气态一氧化碳,以高产率得到双环环戊烯酮 (14例子)。醛作为一氧化碳的来源,它们的羰基部分被转移到烯炔,导致形成羰基化产物。该反应代表了 CO 转移羰基化的第一个例子。
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)).
The synthesis of highly functionalised organic moleculesoften results in large amounts of waste products because ofthe multitude of reagents and the number of purificationsteps involved, which leads to a strong negative environ-mental impact and expensive processes. Thus, the develop-ment of multi-step syntheses, in which several bonds areformed in “one-pot” reactions, is a good tool to reduce thiseffect
Thioureas as Ligands in the Pd-Catalyzed Intramolecular Pauson−Khand Reaction
作者:Yefeng Tang、Lujiang Deng、Yangdong Zhang、Guangbin Dong、Jiahua Chen、Zhen Yang
DOI:10.1021/ol050410y
日期:2005.4.14
[reaction: see text] The thiourea-Pd complex was established as a novel type of catalyst in the PKR of allylpropargylamine, and the demonstrated chemistry may prove to be valuable for developing thiuorea as a ligand for the Pd-catalyzed Pauson-Khandreaction.
Dinickel catalyzed carbonylation reactions using metal carbonyl reagents as CO sources
作者:Colby M. Adolph、Seul Ah Lee、Matthias Zeller、Christopher Uyeda
DOI:10.1016/j.tet.2019.04.064
日期:2019.6
promote stoichiometric Pauson–Khand reactions of enynes and CO (g). However, catalytic turnover is precluded by the strong binding of CO to the Ni2 active site. This article describes the use of M(CO)x reagents as stoichiometric CO precursors in Ni2-catalyzed carbonylation reactions. As part of these studies, well-defined heterotrinuclear Ni2Fe, Ni2Co, and Ni2Mn carbonyl clusters are synthesized using the