Microwave‐Assisted Rhodium‐Complex‐Catalyzed Cascade Decarbonylation and Asymmetric Pauson–Khand‐Type Cyclizations
作者:Hang Wai Lee、Lai Na Lee、Albert S. C. Chan、Fuk Yee Kwong
DOI:10.1002/ejoc.200800272
日期:2008.7
Microwave-assisted Rh–diphosphane-complex-catalyzed dual catalysis is reported. This cooperative process provides [2+2+1] cycloadducts by sequential decarbonylation of aldehyde or formate and carbonylation of enynes within a short period of time. Various O-, N-, and C-tethered enynes were transformed into the corresponding products in good yields. The first enantioselective version of this microwave-accelerated
Rh-Catalyzed Aqueous Pauson-Khand-Type Cycloaddition in Microwave-Irradiated Medium
作者:Fuk Kwong、Albert Chan、Hang Lee
DOI:10.1055/s-2008-1078413
日期:2008.6
Microwave-assisted Rh-catalyzed dual catalysis in aqueous medium is described. This tandem process transforms the enyne to cycloadduct by cascade decarbonylation of formate ester and subsequently carbonylation of enyne under microwave-irradiated conditions.
Intramolecular Pauson–Khand reaction catalyzed by oxime-derived palladacycles
作者:Xue-Rui Wang、Fu-Hua Lu、Yang Song、Zhong-Lin Lu
DOI:10.1016/j.tetlet.2011.11.106
日期:2012.2
Oxime-derived palladacycles were successfully applied as a novel class of catalysts in the intramolecularPauson–Khandreactions. Allylpropargyl ethers and allylpropargyl amines can be efficiently converted to the cyclopentenone products with good to excellent yields.
Utilization of Aldoses as a Carbonyl Source in Cyclocarbonylation of Enynes
作者:Keiichi Ikeda、Tsumoru Morimoto、Kiyomi Kakiuchi
DOI:10.1021/jo1012288
日期:2010.9.17
The reaction of enynes with acetyl-masked aldoses in the presence of a rhodium(I) catalyst resulted in cyclocarbonylation, thus avoiding the direct use of carbon monoxide, to afford bicyclic cyclopentenones. In rhodium catalysis, aldoses serve as a carbon monoxide equivalent by donating their carbonyl moieties on the acyclic aldehyde form to enynes. A variety of aldoses, including d-glucose, d-mannose
CHIRAL LIGAND-BASED METAL-ORGANIC FRAMEWORKS FOR BROAD-SCOPE ASYMMETRIC CATALYSIS
申请人:The University of Chicago
公开号:US20170173572A1
公开(公告)日:2017-06-22
Metal-organic framework (MOFs) compositions based on chiral phosphine-, chiral oxazoline-, chiral pyridine-, and chiral diene-derived organic bridging ligands were synthesized and then post-synthetically metalated with metal precursors such as Ru and Rh complexes. The metal complexes could also be directly incorporated into the MOFs. The MOFs provide a versatile family of recyclable and reusable single-site solid catalysts for catalyzing a variety of asymmetric organic transformations, including the addition of arylboronic acids to α,β-unsaturated ketones and alkimines, the hydrogenation of substituted alkene and carbonyl compounds, and cyclization reactions. The solid catalysts can also be integrated into a flow reactor or a supercritical fluid reactor.