Cobalt-Catalyzed Electrophilic Aminations with Anthranils: An Expedient Route to Condensed Quinolines
作者:Jie Li、Eric Tan、Niklas Keller、Yi-Hung Chen、Peter M. Zehetmaier、Andreas C. Jakowetz、Thomas Bein、Paul Knochel
DOI:10.1021/jacs.8b11466
日期:2019.1.9
The reaction of various organozinc pivalates with anthranils provides anilines derivatives, which cyclize under acidic conditions providing condensed quinolines. Using alkenylzinc pivalates, electron-rich arylzinc pivalates or heterocyclic zinc pivalates produces directly the condensed quinolines of which several structures belong to new heterocyclic scaffolds. These N-heterocycles are of particular
A Highly efficient route for the synthesis of 1,2-disubstituted acetylene derivatives has been developed by palladium catalyzed cross-couplings of alkynyl halides with (hetero)aryl aluminium reagents under mild conditions. This has given corresponding cross-coupling products good to excellent isolated yields of up to 99%. The aryls bearing electron-donating or electron-withdrawing groups in either
Highly Efficient Synthesis of 2-Substituted Benzo[b]furan Derivatives from the Cross-Coupling Reactions of 2-Halobenzo[b]furans with Organoalane Reagents
route for the synthesis of 2-substituted benzo[b]furans has been developed by palladium-catalyzed cross-coupling reaction of 2-halobenzo[b]furans with aryl, alkynyl, and alkylaluminum reagents. Various 2-aryl-, 2-alkynyl-, and 2-alkyl-substituted benzo[b]furan derivatives can be obtained in 23–97% isolated yields using 2–3 mol% PdCl2/4–6 mol% XantPhos as the catalyst under mild reaction conditions. The
Rhodium-Catalyzed Cross-Coupling of Vinylarenes with Arylaluminum Reagents in the Presence of Ketones
作者:Shota Tanaka、Atsunori Mori
DOI:10.1002/ejoc.201301757
日期:2014.2
in the presence of the chloro(1,5-cyclooctadiene)rhodium(I) dimer, [RhCl(cod)]2, and diisopropylketone (2,4-dimethyl-3-pentanone) as an additive occurred to give (E)-stilbene in quantitative yield. The use of other arylaluminum reagents afforded β-arylated products in good to excellent yields. This reaction was found to be promoted by ketones as additives, which are reduced to the corresponding alcohols
实现了芳基铝试剂与乙烯基芳烃的铑催化加成/消除以获得二苯乙烯衍生物。在氯(1,5-环辛二烯)铑(I)二聚体、[RhCl(cod)]2 和二异丙基酮(2,4-二甲基-3-戊酮)存在下二乙基(苯基)铝与苯乙烯的反应) 作为添加剂发生以定量收率产生 (E)-二苯乙烯。使用其他芳基铝试剂以良好至极好的收率提供 β-芳基化产物。发现该反应被作为添加剂的酮促进,酮被还原为相应的醇,如通过 1 H NMR 光谱分析粗反应混合物所证实的。
Copper-Catalyzed Asymmetric Ring-Opening Reaction of Oxabenzonorbornadienes with Grignard and Aluminum Reagents
A highly enantioselective method for the copper-catalyzed desymmetrization of oxabenzonorbornadienes with aluminum reagents and SimplePhos as chiral ligand has been developed. The same reaction with Grignard reagents is also reported. A wide range of alkyl chains have been used with moderate to high enantioselectivity and high trans selectivity. The transfer of a methyl group is also reported with