(±)-2-alkyl-1,2,3,4-tetrahydroquinoline-3-carboxylic esters by a catalyst and pressure dependent tandem reduction-reductive amination reaction
作者:Richard A. Bunce、Takahiro Nago、Nathan Sonobe
DOI:10.1002/jhet.5570440513
日期:2007.9
A series of 2-(2-nitrobenzyl)-substituted β-keto ester derivatives has been subjected to reductive cyclization under catalytic hydrogenation conditions. The reactions were found to be highly dependent on the catalyst and hydrogen pressure used. Hydrogenation over 5% palladium-on-carbon at 4 atmospheres pressure produced complex mixtures of products that included predominantly 1,2,3,4-tetrahydroquinoline
Domino Nitro Reduction-Friedländer Heterocyclization for the Preparation of Quinolines
作者:Kwabena Fobi、Richard A. Bunce
DOI:10.3390/molecules27134123
日期:——
presence of active methylene compounds (AMCs) to produce substituted quinolines in high yields. The conditions are mild enough to tolerate a wide range of functionality in both reacting partners and promote reactions not only with phenyl and benzyl ketones, but also with β-keto-esters, β-keto-nitriles, β-keto-sulfones and β-diketones. The reaction of 2-nitroaromatic ketones with unsymmetrical AMCs is
Enantioselective Synthesis of Endocyclic β-Amino Acids with Two Contiguous Stereocenters via Hydrogenation of 3-Alkoxycarbonyl-2-Substituted Quinolines
Abstract An enantioselective iridium-catalyzedhydrogenation of 3-alkoxycarbonyl-2-substituted quinolinederivatives is described. This methodology provides a convenient route to enantiopure endocyclic β-amino acids with two contiguous stereocenters with up to 90% ee. An enantioselective iridium-catalyzedhydrogenation of 3-alkoxycarbonyl-2-substituted quinolinederivatives is described. This methodology