Dilithium Amides as a Modular Bis-Anionic Ligand Platform for Iron-Catalyzed Cross-Coupling
作者:Peter G. N. Neate、Bufan Zhang、Jessica Conforti、William W. Brennessel、Michael L. Neidig
DOI:10.1021/acs.orglett.1c02053
日期:2021.8.6
Dilithium amides have been developed as a bespoke and general ligand for iron-catalyzed Kumada–Tamao–Corriu cross-coupling reactions, their design taking inspiration from previous mechanistic and structural studies. They allow for the cross-coupling of alkyl Grignard reagents with sp2-hybridized electrophiles as well as aryl Grignard reagents with sp3-hybridized electrophiles. This represents a rare
[EN] HCV NS3 PROTEASE INHIBITORS<br/>[FR] INHIBITEURS DE LA PROTÉASE NS3 DU VHC
申请人:MERCK SHARP & DOHME
公开号:WO2014025736A1
公开(公告)日:2014-02-13
The present invention relates to hepatitis C virus (HCV) NS3 protease inhibitors containing a spirocyclic moeity, uses of such compounds, and synthesis of such compounds.
Single-Component Catalyst/Initiators for the Organocatalytic Ring-Opening Polymerization of Lactide
作者:Szilárd Csihony、Darcy A. Culkin、Alan C. Sentman、Andrew P. Dove、Robert M. Waymouth、James L. Hedrick
DOI:10.1021/ja050909n
日期:2005.6.1
readily release alcohol and the free carbene in solution. These alcohol adducts function as excellent single-component catalyst/initiators for the ring-openingpolymerization of lactideundermildconditions, providing polymers with controlled molecular weights and narrow polydispersities. Multifunctional adducts were used to prepare poly(lactide)s of more complex architectures.
Highly active, recoverable and recyclable transition metal-based metathesis catalysts and their organometallic complexes including dendrimeric complexes are disclosed, including a Ru complex bearing a 1,3-dimesityl-4,5-dihydroimidazol-2-ylidene and styrenyl ether ligand. The heterocyclic ligand significantly enhances the catalytic activity, and the styrenyl ether allows for the easy recovery of the Ru complex. Derivatized catalysts capable of being immobilized on substrate surfaces are also disclosed. The present catalysts can be used to catalyze ring-closing metathesis (RCM), ring-opening (ROM) and cross metatheses (CM) reactions, and promote the efficient formation of various trisubstituted olefins at ambient temperature in high yield.
Synthesis of pentafluorobenzene-based NHC adducts and their catalytic activity in the microwave-assisted reactions of aldehydes
作者:Evanthia Papadaki、Victoria Magrioti
DOI:10.1016/j.tetlet.2019.151419
日期:2020.1
as standalone organocatalysts in various reactions, mostly using aromatic aldehydes as substrates. We have previously demonstrated the efficiency of azolium-2-carboxylate zwitterions in the hydroxymethylation of aldehydes, especially aliphatic aldehydes, under microwave irradiation. In the present work, we report a series of pentafluorobenzene-based NHC adducts and their efficiency in the hydroxymethylation