Palladium-Catalyzed Synthesis of 1,2,3,4-Tetrahydro-5H-2-benzazepin-5-ones
作者:Howard Alper、Kazumi Okuro
DOI:10.1055/s-0032-1317183
日期:——
Palladium-catalyzedintermolecular cyclocarbonylation of 2-iodobenzylamines with Michael acceptors produces 1,2,3,4-tetrahydro-5H-2-benzazepin-5-one derivatives in moderate to good yields. This methodology enables the direct preparation of highly functionalized 1,2,3,4-tetrahydro-5H-2-benzazepin-5-ones from readily available starting materials.
the utilization of light energy for the activation of organic substrates. Here, we demonstrate the catalytic application of ligand-to-metal charge-transfer (LMCT) excitation of cerium alkoxide complexes for the facile activation of alkanes utilizing abundant and inexpensive cerium trichloride as the catalyst. As demonstrated by cerium-catalyzed C-H amination and alkylation of hydrocarbons, this reaction
Aza-MIRC Reactions of Sulfonyl-Activated Hydroxycarbamates withα,β-Difunctionalised Acrylates
作者:Stefania Fioravanti、Alberto Morreale、Lucio Pellacani、Paolo A. Tardella
DOI:10.1002/ejoc.200300425
日期:2003.12
high yields (up to 95%) under mild conditions from the reaction of trisubstituted olefins bearing different groups with nosyloxycarbamates in the presence of calcium oxide. We propose a possible explanation for the different reactivities observed between these olefins and the aminating agents. Reagent-controlled stereoselective amination reactions led to the expected products with high conversions and
(3-Alkoxycarbonyl-2-oxo-propylidene)triphenylphosphorane reacts with 1,2-diacylethylenes to give cyclopentenones in a single operation. Use of a chiral acylmethylenemalonate led to formation of optically active cyclopentenone in a highly diastereoselective fashion.
tris(alkoxycarbonyl) olefins 2 or 1,1-bis(alkoxycarbonyl)-2-acyl olefins 3 in the presence of ZnBr(2) at -30 degrees C gave cis-substituted cyclopropanes exclusively. The origin of the cis stereochemistry is ascribed to the synclinal addition path of the ZnBr(2)-coordinated electrophilic olefin to 1. Application of the highly functionalized selenium- and silicon-substituted cyclopropane products to the preparation