作者:Manuel Guisán-Ceinos、Rita Soler-Yanes、Daniel Collado-Sanz、Vilas B. Phapale、Elena Buñuel、Diego J. Cárdenas
DOI:10.1002/chem.201300882
日期:2013.6.24
reaction involving cyclization followed by cross‐coupling allows the formation of up to three alkyl–alkyl bonds in a single operation by using alkene‐containing alkyl iodides and Grignard reagents (see scheme; acac=acetylacetonate; TMEDA=N,N′,N′‐tetramethyl ethylenediamine). Mechanistic experimental and computational studies suggest a NiI–NiII–NiIII catalytic cycle and the intermediacy of radicals.
提出新颖的断开连接:强大的镍催化级联反应,包括环化和交叉偶联,通过使用含烯烃的烷基碘化物和格利雅试剂,一次操作最多可形成三个烷基-烷基键(请参阅方案; acac =乙酰丙酮酸酯) ; TMEDA = N,N ',N'-四甲基乙二胺)。力学实验和计算研究表明,Ni I –Ni II –Ni III催化循环和自由基的中介。
Cobalt-Catalyzed Csp<sup>3</sup>–Csp<sup>3</sup> Cross-Coupling of Functionalized Alkylzinc Reagents with Alkyl Iodides
作者:Ferdinand H. Lutter、Lucie Grokenberger、Maximilian Benz、Paul Knochel
DOI:10.1021/acs.orglett.0c00795
日期:2020.4.17
A mild cobalt-catalyzed Negishi-type cross-coupling of various functionalized dialkylzinc reagents with primary and secondary alkyl iodides in acetonitrile is reported using a combination of 20% CoCl2 and chelating nitrogen ligands. The method allows the construction of molecules with alkyl chains bearing sensitive functional groups at room temperature.
New Platinum-Catalysed Dihydroalkoxylation of Allenes
作者:María Paz Muñoz、María C. de la Torre、Miguel A. Sierra
DOI:10.1002/adsc.201000342
日期:2010.9.10
A new platinum‐catalysed dihydroalkoxylation of allenes is described to give aliphatic acetals by an unexpected attack of two molecules of methanol to the terminal carbon of the allene moiety. Deuteration experiments suggest an unprecedented formal 1,3‐dipolar addition of methanol to a zwitterionic platinum carbene as the key step. The first platinum‐catalysed intermolecular carbon‐based nucleophile
Fe-catalysed Kumada-type alkyl–alkyl cross-coupling. Evidence for the intermediacy of Fe(i) complexes
作者:Manuel Guisán-Ceinos、Francisco Tato、Elena Buñuel、Paloma Calle、Diego J. Cárdenas
DOI:10.1039/c2sc21754f
日期:——
A novel Fe–NHC catalytic system allows the alkyl–alkyl cross-coupling reaction of alkyl halides and alkylmagnesium reagents has been developed. To our knowledge, this is the first Fe-catalysed Kumada-type coupling for the formation of C(sp3)–C(sp3) bonds in the presence of functional groups. The process takes place under mild conditions, avoiding the formation of β-elimination products. Mechanistic