[DE] EISEN- ODER KOBALT-KATALYSIERTE KOHLENSTOFF-KOHLENSTOFF-KUPPLUNGSREAKTION VON ARYLEN, ALKENEN UND ALKINEN MIT KUPFERREAGENZIEN [EN] IRON OR COBALT-CATALYZED CARBON-CARBON COUPLING REACTION OF ARYLS, ALKENES AND ALKINES WITH COPPER REAGENTS [FR] REACTION DE COUPLAGE CARBONE-CARBONE, CATALYSEES PAR DU FER OU DU COBALT, D'ARYLES, D'ALCENES ET D'ALKINES AVEC DES REACTIFS DE CUIVRE
Stereoselective synthesis of spirocyclic oxindoles based on a one-pot Ullmann coupling/Claisen rearrangement and its application to the synthesis of a hexahydropyrrolo[2,3-b]indole alkaloid
efficient and convenient approach to the synthesis of spirocyclicoxindoles from iodoindoles has been developed. The most striking feature of this approach is that the sequential intramolecular Ullmann coupling and Claisen rearrangement proceeds in a one-pot manner to afford 3-spiro-2-oxindoles in good yield with excellent diastereoselectivity. Application of this one-pot reaction to chiral non-racemic
Readily available from esters or ketones, cyclopropanols are inclined to undergo diverse ring-opening transformations. Their one-electron oxidation is a conventional way to β-carbonyl radicals. However, despite this fact, their application as a coupling partner in dual photoredox and nickel-catalyzed reactions with organic halides remains underdeveloped. Here, we report that the Ti(OiPr)4 additive
环丙醇很容易从酯或酮中获得,倾向于进行各种开环转化。它们的单电子氧化是β-羰基自由基的常规方式。然而,尽管如此,它们作为偶联伙伴在与有机卤化物的双重光氧化还原和镍催化反应中的应用仍然不成熟。在这里,我们报告了 Ti(O i Pr) 4添加剂使这种难以捉摸的与芳基溴和烯基溴的交叉偶联成为可能,从而产生 β 取代的酮。
Regioselective 1,4-Conjugate Addition of Grignard Reagents to Nitrodienes in the Presence of Catalytic Amounts of Zn(II) Salts
作者:Ramesh C. Dhakal、R. Karl Dieter
DOI:10.1021/ol500114m
日期:2014.3.7
Grignard reagents undergo facile regioselective 1,4-conjugate addition to nitrodienes in the presence of catalyticamounts of Zn(II) salts with excellent yields. A wide range of ligands such as alkyl, aryl, heteroaryl, allyl, vinyl, 1-alkynyl, and alkoxy ligands were transferred, while a thiolate ligand afforded 1,6-regioselectivity. The reactions were successfully carried out on δ-alkyl- or aryl-substituted
Copper-Mediated Introduction of the CF<sub>2</sub>
PO(OEt)<sub>2</sub>
Motif: Scope and Limitations
作者:Maria V. Ivanova、Alexandre Bayle、Tatiana Besset、Xavier Pannecoucke、Thomas Poisson
DOI:10.1002/chem.201703542
日期:2017.12.6
can be functionalised. The procedure allows the conversion of aryldiazoniumsalts, as well as aryl, heteroaryl, vinyl and alkynyl iodonium salts, into the corresponding fluorinated molecules at room temperature. Mechanistic studies were performed to gain a better understanding of the reaction pathway. Under similar conditions, vinyl and aryl iodides, allyl halides, and benzyl bromides were also functionalised
Palladium-Catalyzed Alkenylation and Alkynylation of <i>ortho</i>-C(sp<sup>2</sup>)–H Bonds of Benzylamine Picolinamides
作者:Yingsheng Zhao、Gang He、William A. Nack、Gong Chen
DOI:10.1021/ol301214u
日期:2012.6.15
An efficient functionalization of ortho-C(sp2)–H bonds of picolinamide (PA)-protected benzylamine substrates with a range of vinyl iodides as well as acetylenic bromide is reported. ortho-Phenyl benzoic acid (oPBA) acts as an effective promoter in this reaction system. This method provides a practical strategy to access highly functionalized benzylamine compounds for organic synthesis.