Article
Chemistry, Multidisciplinary
Min Yan, Qiang Zhou, Ping Lu
Summary: The nickel catalyzed enantioconvergent Negishi coupling of 4-iodocyclobutenones with aryl or alkenyl zinc reagents is reported, leading to enantioenriched 4-substituted cyclobutenones. A modular approach to the synthesis of 1,2,3,4-tetrasubstituted cyclobutanes is demonstrated.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Chemistry, Multidisciplinary
Jingyi Wang, Xuzhong Shen, Xu Chen, Yinwei Bao, Jian He, Zhan Lu
Summary: In this study, cobalt-catalyzed enantioconvergent cross-coupling of alpha-bromoketones with aryl zinc reagents was achieved, leading to the synthesis of chiral ketones with alpha-tertiary stereogenic centers. Ligand modification was found to be critical for improving the reactivity and selectivity of this transformation.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Chemistry, Organic
Celine Dorval, Oleh Stetsiuk, Sylvaine Gaillard, Elodie Dubois, Corinne Gosmini, Gregory Danoun
Summary: A novel Negishi-type cross-coupling reaction using only cobalt bromide salt as the catalyst is described in this study. This original reaction demonstrates high tolerance to various glutarimide amides and organozinc coupling partners. Additionally, the reaction can be performed on a large scale using an eco-compatible solvent such as ethyl acetate.
Article
Chemistry, Organic
Guy J. Clarkson, Stefan Roesner
Summary: An efficient methodology for the synthesis of benzofuropyridines and dibenzofurans from fluoropyridines or fluoroarenes and 2-bromophenyl acetates is presented. The streamlined one-pot procedure involves four-step directed ortho-lithiation, zincation, Negishi cross-coupling, and intramolecular nucleophilic aromatic substitution, enabling the easy assembly of a diverse set of fused benzofuro heterocycles.
JOURNAL OF ORGANIC CHEMISTRY
(2023)
Article
Chemistry, Applied
Shainthavaan Sathiyalingam, Stefan Roesner
Summary: A methodology for the synthesis of alpha- and beta-carbolines from fluoropyridines and 2-haloanilines is described. The procedure involves a four-step directed ortho-lithiation, zincation, Negishi cross-coupling, and intramolecular nucleophilic aromatic substitution, enabling the synthesis of a diverse set of functionalized carbolines. The generation of arylzinc intermediates in continuous flow has also been demonstrated.
ADVANCED SYNTHESIS & CATALYSIS
(2022)
Article
Chemistry, Multidisciplinary
Steffen Dachwitz, Bjarne Scharkowski, Norbert Sewald
Summary: Mild transition-metal catalysed cross-couplings allow for direct functionalization of biocatalytically halogenated tryptophans and provide a simple way to synthesize (homo)tryptophan regioisomers. This method offers non-canonical constitutional surrogates of tryptophan for use in peptide synthesis.
CHEMISTRY-A EUROPEAN JOURNAL
(2021)
Article
Multidisciplinary Sciences
Xu Luo, Dali Yang, Xiaoqian He, Shengchun Wang, Dongchao Zhang, Jiaxin Xu, Chih-Wen Pao, Jeng-Lung Chen, Jyh-Fu Lee, Hengjiang Cong, Yu Lan, Hesham Alhumade, Janine Cossy, Ruopeng Bai, Yi-Hung Chen, Hong Yi, Aiwen Lei
Summary: The authors report an on-cycle mechanism for CoCl2bpy2 catalyzed Negishi-type cross-coupling, elucidating the full catalytic cycle through multiple spectroscopic studies. Solvent and ligand were found to be crucial for generating catalytically active Co(I) species, with acetonitrile and bipyridine ligand resisting Co(I) disproportionation events. Combined investigations using Q-XAFS, EPR, IR, and DFT calculations provide comprehensive mechanistic insights into the structural information of the catalytic cobalt species and the entire Co(I)/Co(III) cycle. Additionally, the acetonitrile and bipyridine system can be extended to acylation, allylation, and benzylation reactions of aryl zinc reagents, demonstrating a broad substrate scope with a catalytic amount of Co salt. Overall, this work offers a fundamental mechanistic perspective for designing cobalt-catalyzed cross-coupling reactions.
NATURE COMMUNICATIONS
(2023)
Article
Chemistry, Multidisciplinary
Jaime Ponce-de-Leon, Pablo Espinet
Summary: Highly selective cross-coupling reactions to polyfluorinated assymmetric biaryls, including the symmetric biaryl C6F5-C6F5, were achieved at relatively low temperature (80 degrees C) and in short times using [MCl2(PhPEWO-F)] catalysts (M = Ni, Pd), with (ArI)-I-F and Zn(C6F5)(2) as examples of highly fluorinated nucleophiles.
CHEMICAL COMMUNICATIONS
(2021)
Article
Chemistry, Organic
Seiya Miyagi, Reiko Yokoo, Takahiro Tanigawa, Dinda B. Pitna, Mika Hirose, Toyonobu Usuki
Summary: Desmosine-BSA/KLH conjugates were successfully synthesized through specific synthesis steps and reactions, and they were designed for the development of an effective antibody for ELISA systems.
TETRAHEDRON LETTERS
(2022)
Article
Chemistry, Physical
Xufeng Ma, Han Wang, Yao Liu, Xing Zhao, Jun Zhang
Summary: Mixed alkyl/aryl diphos ligands have shown enhanced activity and selectivity in iron-catalyzed cross coupling reactions, with the electronic effect of the ligands playing a crucial role in catalytic performance. Fe catalyst supported by L8 exhibited the best catalytic performance and good functional group tolerance.
Article
Chemistry, Organic
Xiaolan Li, Haiqing Luo, Ruixin Song, Yuting Zhang, Xian Gong, Hu Cai, Xuzhong Luo
Summary: The developed methodology demonstrates an efficient Rh(III)-catalyzed oxidative C-H/C-H cross-coupling reaction between acyclic enamides and heteroarenes. This reaction offers advantages of excellent regio- and stereoselectivity, good compatibility with various functional groups, and a broad range of substrates. Mechanistically, Rh(III)-catalyzed β-C(sp(2))-H activation of acyclic enamides is proposed as the crucial step.
Article
Chemistry, Multidisciplinary
Damian Gross, Willem A. L. van Otterlo, Oliver Trapp, Dino Berthold
Summary: This study reveals that higher-order zincates are the transmetallating active species in Negishi cross-coupling reactions, and demonstrates their high reactivity and stability through synthesis experiments.
CHEMISTRY-A EUROPEAN JOURNAL
(2023)
Article
Chemistry, Organic
Weiping Wu, Xuan Wu, Shuaixin Fan, Jin Zhu
Summary: Diversity-oriented synthesis is a valuable method for expanding the chemical space, but its application is limited by the available toolbox for skeleton-diversification chemistry. In this study, we report the Rh(III)-catalyzed coupling of enaminones and diazodicarbonyls for the synthesis of isocoumarins and naphthalenes with divergent skeletons. The dependence of the skeleton-forming process on the ring size of diazodicarbonyls and pH demonstrates the achievement of both substrate-and reagent-controlled skeletal diversity generation in a single system. Moreover, the C-C bond cleavage reactivity is found to be critical for facile synthetic access to isocoumarins.
Article
Chemistry, Inorganic & Nuclear
Tomasz Sokolnicki, Adrian Franczyk, Radoslaw Kozak, Jedrzej Walkowiak
Summary: A simple one-step reaction was demonstrated for the functionalization of 2,4,6,8-tetramethylcyclotetrasiloxane DH4, resulting in branched organosilicon compounds DSP3 or DS3P with affinity to silica and various organic groups capable of bonding with polymers. The synthesis of 13 new compounds with excellent yields and precise functional group distribution was achieved using sequential hydrosilylation and Karstedt's catalyst. The obtained compounds are versatile silica modifiers, silane coupling agents, and starting materials for polymer networks and vapor-deposited coatings.
INORGANIC CHEMISTRY FRONTIERS
(2023)
Article
Chemistry, Multidisciplinary
Chao Yang, Lenka Postova Slavetinska, Marianne Fleuti, Blanka Klepetarova, Michal Tichy, Sona Gurska, Petr Pavlis, Petr Dzubak, Marian Hajduch, Michal Hocek
Summary: A new method for synthesizing polycyclic thieno-fused 7-deazapurine nucleosides was developed, leading to a series of nucleosides with good cytotoxic activity.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2022)
Article
Chemistry, Medicinal
Monika Ali Khan, Pauline J. Wood, Natasha M. Lamb-Guhren, Lorenzo Caggiano, Gabriele Kociok-Koehn, David Tosh, Simon E. Lewis
BIOORGANIC & MEDICINAL CHEMISTRY LETTERS
(2014)
Article
Chemistry, Multidisciplinary
Alexander Ciupa, Paul A. De Bank, Lorenzo Caggiano
CHEMICAL COMMUNICATIONS
(2013)
Article
Chemistry, Multidisciplinary
Lorenzo Caggiano, Richard F. W. Jackson, Anthony J. H. M. Meijer, Barry T. Pickup, Karl A. Wilkinson
CHEMISTRY-A EUROPEAN JOURNAL
(2008)
Article
Chemistry, Organic
Katie E. Judd, Lorenzo Caggiano
ORGANIC & BIOMOLECULAR CHEMISTRY
(2011)
Article
Chemistry, Organic
Alexander Ciupa, Mary F. Mahon, Paul A. De Bank, Lorenzo Caggiano
ORGANIC & BIOMOLECULAR CHEMISTRY
(2012)
Article
Chemistry, Organic
Carmelo Drago, Emma-Jane Walker, Lorenzo Caggiano, Richard F. W. Jackson
Article
Chemistry, Organic
Katie E. Judd, Mary F. Mahon, Lorenzo Caggiano
SYNTHESIS-STUTTGART
(2009)
Article
Chemistry, Organic
Claire L. Oswald, Tomas Carrillo-Marquez, Lorenzo Caggiano, Richard F. W. Jackson
Article
Biochemistry & Molecular Biology
Alexander Ciupa, Natalie J. Griffiths, Stephanie K. Light, Pauline J. Wood, Lorenzo Caggiano
Article
Biochemistry & Molecular Biology
Gemma A. Tunbridge, Joseph Oram, Lorenzo Caggiano
Article
Biochemistry & Molecular Biology
Alexander Ciupa, Paul A. De Bank, Mary F. Mahon, Pauline J. Wood, Lorenzo Caggiano
Article
Chemistry, Multidisciplinary
Gemma A. Tunbridge, Riccardo Baruchello, Lorenzo Caggiano
Article
Chemistry, Medicinal
Benjamin E. Alexander, Sijia Sun, Matthew J. Palframan, Gabriele Kociok-Kohn, Dya Fita Dibwe, Shiro Watanabe, Lorenzo Caggiano, Suresh Awale, Simon E. Lewis
Article
Chemistry, Multidisciplinary
Gemma A. Di Iulio, Mary F. Mahon, Lorenzo Caggiano
Summary: Pancratistatin framework can be accessed through a concise synthetic route without the need for metal catalysis or activated substrates. This method offers the possibility of generating various pancratistatin analogues for further development.