[EN] PYRIDAZIN-3(2H)-ONE DERIVATIVES AND THEIR USE AS PDE4 INHIBITORS [FR] NOUVEAUX DERIVES DE PYRIDAZIN-3(2H)-ONE ET LEURS UTILISATION EN TANT QU'INHIBITEURS DE PDE4
Regioselective Synthesis of Dihydrothiophenes and Thiophenes via the Rhodium-Catalyzed Transannulation of 1,2,3-Thiadiazoles with Alkenes
作者:Jeong-Yu Son、Jonghye Kim、Sang Hoon Han、Sung Hong Kim、Phil Ho Lee
DOI:10.1021/acs.orglett.6b02805
日期:2016.10.21
regioselective synthesis of a wide range of dihydrothiophenes was developed from the rhodium-catalyzed transannulation of 1,2,3-thiadiazoles with aliphatic, aromatic, and heteroaromatic alkenes. Tandem rhodium-catalyzed transannulation of 1,2,3-thiadiazoles with alkenes followed by 2,3-dichloro-5,6-dicyano-1,4-benzoquinone (DDQ) oxidation was also demonstrated for the one-pot regioselective synthesis of various
An enantioselective one-pot aldol/lactonization sequence has been developed to access highly challenging γ-butyrolactones bearing an all-carbonquaternarystereocenter at the β-position by reacting acylated succinic esters with aqueous formaldehyde in the presence of 3 mol % loading of a cinchona alkaloid-derived squaramide providing direct access to paraconic acid derivatives in high yield and fairly
herein an Ir-catalyzed intermolecular amino group transfer to β-ketoesters (amides) to access α-aminocarbonyl products with excellent chemoselectivity. The key strategy was to engineer electrophilicity of the putative Ir-nitrenoids by tuning electronic property of the κ2-N,O chelating ligands, thus facilitating nucleophilic addition of enol π-bonds of 1,3-dicarbonyl substrates.
One-Pot Synthesis of 2-Aryl- and 2-Alkylbenzothiazoles under Microwave Irradiation
作者:Edward R. Biehl、Sukanta Kamila、Hongming Zhang
DOI:10.3987/com-05-10466
日期:——
Eco-friendly direct solvent-free reactions of o-aminothiophenol and aromatic or aliphatic β-keto esters with microwave irradiation produced 2-substituted benzothiazoles in excellent yield. Experiments that compared microwave irradiation to conventional heating methods showed that the former gives the 2-substituted benzothiazoles faster and in higher yields. The formation of the titled compounds probably