Palladium Nanoparticles Immobilized on Nanosilica Triazine Dendritic Polymer (Pd np -nSTDP) as Catalyst in the Synthesis of Mono-, Di-, and Trisulfides through C–S Cross-Coupling Reactions
A wide variety of diaryl sulfides has been synthesized in excellent yields via C–S cross-couplings of aryl/heteroaryl halides with aromatic/heteroaromatic thiols in the presence of palladiumnanoparticlesimmobilized on nanosilica triazinedendriticpolymer (Pd np -nSTDP) as a reusablecatalyst under thermal conditions and microwave irradiation. Pd np -nSTDP also showed excellent catalytic activity
Ruthenium-Catalyzed <i>para</i>
-Selective C−H Alkylation of Aniline Derivatives
作者:Jamie A. Leitch、Claire L. McMullin、Andrew J. Paterson、Mary F. Mahon、Yunas Bhonoah、Christopher G. Frost
DOI:10.1002/anie.201708961
日期:2017.11.20
The para‐selectiveC−H alkylation of aniline derivatives furnished with a pyrimidine auxiliary is herein reported. This reaction is proposed to take place via an N−H‐activated cyclometalate formed in situ. Experimental and DFT mechanistic studies elucidate a dual role of the ruthenium catalyst. Here the ruthenium catalyst can undergo cyclometalation by N−H metalation (as opposed to C−H metalation in
Ring Opening of Pymisyl‐Protected Aziridines with Organocuprates
作者:Jan Bornholdt、Jakob Felding、Rasmus P. Clausen、Jesper L. Kristensen
DOI:10.1002/chem.201001026
日期:2010.11.2
The pyrimidine‐2‐sulfonyl (pymisyl) group is introduced as a new protecting group that can be used to activate aziridines towards ringopening. It is readily introduced and removed under mild conditions. Regioselective ringopening of pymisyl‐protected 2‐methyl‐aziridine with organocuprates gives the corresponding sulfonamides in high yields, and the pymisyl group can subsequently be removed upon treatment
constrained binuclear palladium catalyst system affords selective thioetherification of a wide range of functionalized arenethiols with chloroheteroaromatic partners with the highest turnover numbers (TONs) reported to date and tolerates a large variety of reactive functions. The scope of this system includes the coupling of thiophenols with six‐ and five‐membered 2‐chloroheteroarenes (i.e., functionalized
provide efficient synthetic access to heteroaryl sulfones in two-steps using a simple palladium–1,1′-bis[(diphenyl)phosphanyl]ferrocene catalyst to form in high yields variously functionalized heteroaromatic thioethers. Pyridinyl-containing substrates can be subsequently selectively oxidized into sulfones and NH-sulfoximines by using very mild oxidation conditions with a high functional group tolerance