Azoalkene Route to Methyl 2,5-Dimethyl-4-[2-(phenylmethyl)benzoyl]-1H-pyrrole-3-carboxylate (FPL 64176) and Analogues: Synthesis of 1-(BOC-amino)pyrrole-3-carboxylates and Their Conversion to 1H-Pyrroles via 1-Aminopyrroles
Nanostructured molybdenum oxides and their catalytic performance in the alkylation of arenes
作者:Feng Wang、Wataru Ueda
DOI:10.1039/b803205j
日期:——
We report for the first time that nanostructured MoO3 is an excellent catalyst for the alkylation of a wide range of arenes with substituted benzyl alcohols as alkylating agents.
Suzuki Cross-Coupling Reactionof Benzylic Halides with Arylboronic Acids in the Presence of aTetraphosphine/Palladium Catalyst
作者:Henri Doucet、Maurice Santelli、Ludovic Chahen
DOI:10.1055/s-2003-40994
日期:——
The cis,cis,cis-1,2,3,4-tetrakis(diphenylphosphinomethyl)cyclopentane-[PdCl(C3H5)]2 systemcatalyses efficiently the Suzuki cross-coupling reaction of benzylichalides with arylboronic acids. A wide variety of benzylic bromidesor chlorides and functionalised arylboronic acids lead selectivelyto the corresponding diarylmethane adducts in good yields. Furthermore,this catalyst can be used at low loading in many cases.
cobalt‐catalyzed arylation of benzyl chlorides has been developed in order to form functionalized diarylmethanes. A variety of reactive groups either on the aryl or the benzyl halide was employed. This represents the first cobalt‐catalyzed reductive cross‐coupling which does not require any ligand and pyridine. A reaction pathway is proposed involving a radical benzyl species.
High Catalytic Efficiency of Nanostructured Molybdenum Trioxide in the Benzylation of Arenes and an Investigation of the Reaction Mechanism
作者:Feng Wang、Wataru Ueda
DOI:10.1002/chem.200801153
日期:2009.1.5
catalyst exhibited high efficiency in catalyzing the benzylation of various arenes with substituted benzyl alcohols, which were strikingly different to common bulk MoO3. Most reactions offered >99 % conversion and >99 % selectivity to monoalkylated compounds. MoO3 is a typical acid catalyst. However, the benzylation reaction over nanostructured MoO3 does not belong to the acid‐catalyzed type or defect
Transition-Metal-Free Intramolecular Carbene Aromatic Substitution/Büchner Reaction: Synthesis of Fluorenes and [6,5,7]Benzo-fused Rings
作者:Zhenxing Liu、Haocheng Tan、Long Wang、Tianren Fu、Ying Xia、Yan Zhang、Jianbo Wang
DOI:10.1002/anie.201409982
日期:2015.3.2
Intramoleculararomaticsubstitution and Büchner reaction have been established as powerful methods for the construction of polycyclic compounds. These reactions are traditionally catalyzed by RhII catalysts with α‐diazocarbonyl compounds as the substrates. Herein a transition‐metal‐free intramoleculararomaticsubstitution/Büchner reaction is presented. These reactions use readily available N‐tosylhydrazones