Synthesis of Functionalized Benzo[b]thiophenes by the Intramolecular Copper-Catalyzed Carbomagnesiation of Alkynyl(aryl)thioethers
作者:Thomas Kunz、Paul Knochel
DOI:10.1002/anie.201106734
日期:2012.2.20
Highly functional: A copper(I)‐catalyzed intramolecularcarbomagnesiation under mild conditions transforms readily available alkynyl(aryl)thioethers into magnesiated benzothiophenes. Subsequent reaction with various electrophiles (acid chlorides, allyl bromides, aryl halides) provides polyfunctional benzo[b]thiophenes (see scheme). Further modification of the cyclization products affords highly diversified
高度功能化:在温和条件下,铜(I)催化的分子内碳镁化作用可将易得的炔基(芳基)硫醚转变成镁化的苯并噻吩。随后与各种亲电试剂(酰氯,烯丙基溴,芳基卤化物)反应,可得到多官能的苯并[ b ]噻吩(请参见方案)。环化产物的进一步修饰提供了高度多样化的苯并噻吩衍生物和新的杂环支架。
作者:Gregory A. Price、Andrew R. Bogdan、Ana L. Aguirre、Toshiyuki Iwai、Stevan W. Djuric、Michael G. Organ
DOI:10.1039/c6cy00331a
日期:——
Pd-PEPPSI–IPr complex prepared via azide–alkyne cycloaddition is described. The complex was immobilised onto silica gel and applied as a heterogeneouscatalyst in the Negishi reaction. The catalyst was active in both batch and continuous flow operation and was particularly effective for the coupling of heteroaryl chlorides. Long-term continuous flow experiments demonstrated good catalyst activity over
Access to Functionalized Quaternary Stereocenters via the Copper-Catalyzed Conjugate Addition of Monoorganozinc Bromide Reagents Enabled by <i>N</i>,<i>N-</i>Dimethylacetamide
作者:Tyler J. Fulton、Phebe L. Alley、Heather R. Rensch、Adriana M. Ackerman、Cameron B. Berlin、Michael R. Krout
DOI:10.1021/acs.joc.8b02201
日期:2018.12.7
reagents, readily obtained from alkyl bromides, display excellent reactivity with β,β-disubstituted enones and TMSCl in the presence of Cu(I) and Cu(II) salts to synthesize a variety of cyclic functionalized β-quaternary ketones in 38–99% yields and 9:1–20:1 diastereoselectivities. The conjugate addition features a pronounced improvement in DMA using monoorganozinc bromide reagents. A simple one-pot protocol
Csp<sup>3</sup>–Csp<sup>3</sup> Bond-Forming Reductive Elimination from Well-Defined Copper(III) Complexes
作者:Matthew Paeth、Sam B. Tyndall、Liang-Yu Chen、Jia-Cheng Hong、William P. Carson、Xingwu Liu、Xiaodong Sun、Jinjia Liu、Kundi Yang、Elizabeth M. Hale、David L. Tierney、Bin Liu、Zhi Cao、Mu-Jeng Cheng、William A. Goddard、Wei Liu
DOI:10.1021/jacs.8b12632
日期:2019.2.20
Carbon-carbon bond-forming reductive elimination from elusive organocopper(III) complexes has been considered the key step in many copper-catalyzed and organocuprate reactions. However, organocopper(III) complexes with well-defined structures that can undergo reductive elimination are extremely rare, especially for the formation of Csp3-Csp3 bonds. We report herein a general method for the synthesis
Cobalt‐Catalyzed Cross‐Coupling of Functionalized Alkylzinc Reagents with (Hetero)Aryl Halides
作者:Ferdinand H. Lutter、Lucie Grokenberger、Philipp Spieß、Jeffrey M. Hammann、Konstantin Karaghiosoff、Paul Knochel
DOI:10.1002/anie.201914490
日期:2020.3.27
A combination of 10 % CoCl2 and 20 % 2,2'-bipyridine ligands enables cross-coupling of functionalized primary and secondary alkylzinc reagents with various (hetero)arylhalides. Couplings with 1,3- and 1,4-substituted cycloalkylzinc reagents proceeded diastereoselectively leading to functionalized heterocycles with high diastereoselectivities of up to 98:2. Furthermore, alkynyl bromides react with