1
|
Kim K, You E, Hong S. Nucleophilic C4-selective (hetero) arylation of pyridines for facile synthesis of heterobiaryls. Front Chem 2023; 11:1254632. [PMID: 37720719 PMCID: PMC10502421 DOI: 10.3389/fchem.2023.1254632] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2023] [Accepted: 08/17/2023] [Indexed: 09/19/2023] Open
Abstract
The synthesis of heterobiaryl compounds holds significant value in organic chemistry due to their extensive range of applications. Herein, we report a highly efficient strategy for conducting C4-selective (hetero) arylation of pyridines using N-aminopyridinium salts. The reaction proceeds readily at room temperature in the presence of a base, thus eliminating the requirement for catalysts or oxidants. This method allows for the installation of various electron-rich (hetero) aryl groups on pyridines, resulting in the streamlined synthesis of highly valuable C4-(hetero) aryl pyridine derivatives, which are otherwise challenging to acquire via conventional methods. This simple and straightforward method will facilitate access to a range of heterobiaryl compounds thereby promoting their application in various scientific disciplines.
Collapse
Affiliation(s)
- Kewon Kim
- Department of Chemistry, Korea Advanced Institute of Science and Technology (KAIST), Daejeon, Republic of Korea
- Center for Catalytic Hydrocarbon Functionalizations, Institute for Basic Science (IBS), Daejeon, Republic of Korea
| | - Euna You
- Department of Chemistry, Korea Advanced Institute of Science and Technology (KAIST), Daejeon, Republic of Korea
- Center for Catalytic Hydrocarbon Functionalizations, Institute for Basic Science (IBS), Daejeon, Republic of Korea
| | - Sungwoo Hong
- Department of Chemistry, Korea Advanced Institute of Science and Technology (KAIST), Daejeon, Republic of Korea
- Center for Catalytic Hydrocarbon Functionalizations, Institute for Basic Science (IBS), Daejeon, Republic of Korea
| |
Collapse
|
2
|
Shukla F, Patel M, Gulamnabi Q, Thakore S. Palladium nanoparticles-confined pore-engineered urethane-linked thiol-functionalized covalent organic frameworks: a high-performance catalyst for the Suzuki Miyaura cross-coupling reaction. Dalton Trans 2023; 52:2518-2532. [PMID: 36734618 DOI: 10.1039/d2dt04057c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
Covalent organic frameworks (COFs) are potential templates for the synthesis of nanomaterials owing to the versatility of their structure. Most of the reported COFs comprise imine linkages. Herein, we report for the first time the synthesis of a urethane-linked COF (UCOF) using monoformylphloroglucinol and 1,4-phenylene diisocyanate as monomers. Furthermore, the UCOF was functionalized with cysteamine to introduce free dangling thiol groups into the cavity. The latter played a critical role in fixing the active metal efficiently and facilitating the confined growth of small metal nanoparticles (∼4-6 nm) with a high surface area leading to a pore-engineered heterogeneous Pd catalyst (PdNPs@UCOF-SH). The COF and Pd catalyst were characterized using various analytical techniques such as CP-MAS NMR, FTIR, PXRD, BET, FEG-SEM, HRTEM, XPS, TGA, and ICP-AES. The as-prepared UCOF-SH-supported Pd nanoparticles showed excellent catalytic activity in the Suzuki Miyaura cross-coupling reaction under mild conditions with low catalyst loading and eco-friendly solvents. The scope was extended to various aryl boronic acids and aryl halides (I, Br, and Cl). The halo-substituted and non-halo biaryl derivatives were obtained in good to excellent yields, within a shorter reaction time, avoiding the homocoupling of aryl boronic acid. The pore-engineered COF-derived catalyst is selective and easily recycled up to 10 runs without significant loss of catalytic activity. This reveals the robust nature of the PdNPs@UCOF-SH catalyst and the sustainability of the process which opens a new frontier for several catalytic applications.
Collapse
Affiliation(s)
- Falguni Shukla
- Department of Chemistry, Faculty of Science, The Maharaja Sayajirao University of Baroda, Vadodara, 390002, India.
| | - Miraj Patel
- Department of Chemistry, Faculty of Science, The Maharaja Sayajirao University of Baroda, Vadodara, 390002, India.
| | - Qureshi Gulamnabi
- Department of Chemistry, Faculty of Science, The Maharaja Sayajirao University of Baroda, Vadodara, 390002, India.
| | - Sonal Thakore
- Department of Chemistry, Faculty of Science, The Maharaja Sayajirao University of Baroda, Vadodara, 390002, India.
| |
Collapse
|
3
|
Pan S, Gao C, Gui J, Hu B, Gai L, Qiao C, Liu C. Hierarchical TiO2 Microspheres Supported Ultrasmall Palladium Nanocrystals: a Highly Efficient Catalyst for Suzuki Reaction. ARAB J CHEM 2022. [DOI: 10.1016/j.arabjc.2022.104410] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
|
4
|
Suri G, Liang F, Hu M, Wang M, Bu R, Zhang X, Wang H, Dong W, Eerdun C, Tsuda A. Direct Syntheses of Diphenylmethanol Derivatives from Substituted Benzenes and CHCl 3 through Friedel-Crafts Alkylation and Post-Synthetic Hydrolysis or Alcoholysis Catalyzed by Alumina. ChemistryOpen 2022; 11:e202200042. [PMID: 35585035 PMCID: PMC9117155 DOI: 10.1002/open.202200042] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2022] [Revised: 04/22/2022] [Indexed: 11/14/2022] Open
Abstract
The present study reports an innovative finding that alumina containing water or primary alcohol catalyzes the hydrolysis or alcoholysis, respectively, of the product formed through AlCl3 -mediated Friedel-Crafts alkylation of methyl-substituted benzenes and CHCl3 . The former and later reactions mainly provided hydroxy- and alkoxy-substituted diarylmethanes, respectively, while the reference reactions without alumina provided bisarylchloromethane. This method enables the selective syntheses of diphenylmethanol derivatives with very simple procedures, without expensive reagents and apparatuses. Furthermore, the alumina used in the reaction could be recycled by washing with water and subsequent drying. From the viewpoint of material recycling, this function is very important for the development of sustainable chemical reactions.
Collapse
Affiliation(s)
- Guga Suri
- Department of Pharmaceutical SciencesInner Mongolia Medical UniversityJinshan Economic & Technology Development DistrictHohhot, InnerMongolia010110P. R. China
| | - Fengying Liang
- Department of Pharmaceutical SciencesInner Mongolia Medical UniversityJinshan Economic & Technology Development DistrictHohhot, InnerMongolia010110P. R. China
| | - Mixia Hu
- Department of Pharmaceutical SciencesInner Mongolia Medical UniversityJinshan Economic & Technology Development DistrictHohhot, InnerMongolia010110P. R. China
| | - Meiling Wang
- Department of Pharmaceutical SciencesInner Mongolia Medical UniversityJinshan Economic & Technology Development DistrictHohhot, InnerMongolia010110P. R. China
| | - Ren Bu
- Department of Pharmaceutical SciencesInner Mongolia Medical UniversityJinshan Economic & Technology Development DistrictHohhot, InnerMongolia010110P. R. China
| | - Xiaoying Zhang
- Department of Pharmaceutical SciencesInner Mongolia Medical UniversityJinshan Economic & Technology Development DistrictHohhot, InnerMongolia010110P. R. China
| | - Hui Wang
- Department of Pharmaceutical SciencesInner Mongolia Medical UniversityJinshan Economic & Technology Development DistrictHohhot, InnerMongolia010110P. R. China
| | - Wenyan Dong
- Department of Pharmaceutical SciencesInner Mongolia Medical UniversityJinshan Economic & Technology Development DistrictHohhot, InnerMongolia010110P. R. China
| | - Chaolu Eerdun
- Department of Pharmaceutical SciencesInner Mongolia Medical UniversityJinshan Economic & Technology Development DistrictHohhot, InnerMongolia010110P. R. China
| | - Akihiko Tsuda
- Department of Pharmaceutical SciencesInner Mongolia Medical UniversityJinshan Economic & Technology Development DistrictHohhot, InnerMongolia010110P. R. China
- Department of ChemistryGraduate School of ScienceKobe University1-1 Rokkodai-cho, Nada-kuKobe657-8501Japan
| |
Collapse
|
5
|
Li HH, Li S, Cheng JK, Xiang SH, Tan B. Direct arylation of N-heterocycles enabled by photoredox catalysis. Chem Commun (Camb) 2022; 58:4392-4395. [PMID: 35297913 DOI: 10.1039/d2cc01212j] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
N-Heterobiaryls are common skeletons found in biological molecules, pharmaceuticals and ligands. Herein, we document an efficient and redox-neutral photocatalytic system to obtain functionalized N-heterobiaryls under mild conditions. Substrates bearing variegated functional groups are compatible with the developed photocatalytic conditions. This method is translatable to gram-scale synthesis, with a photocatalyst loading as low as 0.1 mol% and minimal variation of the yield. The starting materials are commercially available, demonstrating the practicality and accessibility of this methodology. Interestingly, phenols can serve both as coupling partners and proton donors. Arenes without a phenolic hydroxyl group also underwent efficient coupling with HFIP as a solvent.
Collapse
Affiliation(s)
- Heng-Hui Li
- School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150001, China. .,Shenzhen Grubbs Institute, Department of Chemistry and Guangdong Provincial Key Laboratory of Catalysis, Southern University of Science and Technology, Shenzhen, 518055, China
| | - Shaoyu Li
- Shenzhen Grubbs Institute, Department of Chemistry and Guangdong Provincial Key Laboratory of Catalysis, Southern University of Science and Technology, Shenzhen, 518055, China
| | - Jun Kee Cheng
- Shenzhen Grubbs Institute, Department of Chemistry and Guangdong Provincial Key Laboratory of Catalysis, Southern University of Science and Technology, Shenzhen, 518055, China
| | - Shao-Hua Xiang
- Shenzhen Grubbs Institute, Department of Chemistry and Guangdong Provincial Key Laboratory of Catalysis, Southern University of Science and Technology, Shenzhen, 518055, China
| | - Bin Tan
- Shenzhen Grubbs Institute, Department of Chemistry and Guangdong Provincial Key Laboratory of Catalysis, Southern University of Science and Technology, Shenzhen, 518055, China
| |
Collapse
|
6
|
Wu X, Lin W, Wang L, Li N, Tu G, Fu Y, Chen DL, Zhu W, Chen G, Zhang F. Highly dispersed palladium nanoclusters anchored on nanostructured hafnium( iv) oxide as highly efficient catalysts for the Suzuki–Miyaura coupling reaction. NEW J CHEM 2022. [DOI: 10.1039/d2nj00949h] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Pd@HfO2 derived via two-step pyrolysis of Pd@NH2-UiO-66(Hf) exhibited high catalytic activity for the Suzuki–Miyaura coupling reactions.
Collapse
Affiliation(s)
- Xiaoxue Wu
- Key Laboratory of the Ministry of Education for Advanced Catalysis Materials, Institute of Physical Chemistry, Zhejiang Normal University, 321004 Jinhua, People's Republic of China
| | - Wenting Lin
- Key Laboratory of the Ministry of Education for Advanced Catalysis Materials, Institute of Physical Chemistry, Zhejiang Normal University, 321004 Jinhua, People's Republic of China
| | - Li Wang
- Key Laboratory of the Ministry of Education for Advanced Catalysis Materials, Institute of Physical Chemistry, Zhejiang Normal University, 321004 Jinhua, People's Republic of China
| | - Nan Li
- Key Laboratory of the Ministry of Education for Advanced Catalysis Materials, Institute of Physical Chemistry, Zhejiang Normal University, 321004 Jinhua, People's Republic of China
| | - Gaomei Tu
- Key Laboratory of the Ministry of Education for Advanced Catalysis Materials, Institute of Physical Chemistry, Zhejiang Normal University, 321004 Jinhua, People's Republic of China
| | - Yanghe Fu
- Key Laboratory of the Ministry of Education for Advanced Catalysis Materials, Institute of Physical Chemistry, Zhejiang Normal University, 321004 Jinhua, People's Republic of China
| | - De-Li Chen
- Key Laboratory of the Ministry of Education for Advanced Catalysis Materials, Institute of Physical Chemistry, Zhejiang Normal University, 321004 Jinhua, People's Republic of China
| | - Weidong Zhu
- Key Laboratory of the Ministry of Education for Advanced Catalysis Materials, Institute of Physical Chemistry, Zhejiang Normal University, 321004 Jinhua, People's Republic of China
| | - Guihua Chen
- School of Pharmaceutical and Material Engineering, Taizhou University, 318000 Jiaojiang, People's Republic of China
| | - Fumin Zhang
- Key Laboratory of the Ministry of Education for Advanced Catalysis Materials, Institute of Physical Chemistry, Zhejiang Normal University, 321004 Jinhua, People's Republic of China
| |
Collapse
|
7
|
Yamada T, Park K, Sajiki H. Development of Solid Catalysts for Selective Reactions and their Application to Continuous-Flow Reactions. J SYN ORG CHEM JPN 2021. [DOI: 10.5059/yukigoseikyokaishi.79.472] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Tsuyoshi Yamada
- Laboratory of Organic Chemistry, Gifu Pharmaceutical University
| | | | - Hironao Sajiki
- Laboratory of Organic Chemistry, Gifu Pharmaceutical University
| |
Collapse
|
8
|
Magnetic chitosan-functionalized cobalt-NHC: Synthesis, characterization and catalytic activity toward Suzuki and Sonogashira cross-coupling reactions of aryl chlorides. MOLECULAR CATALYSIS 2021. [DOI: 10.1016/j.mcat.2021.111573] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
|
9
|
You LX, Zhao BB, Yao SX, Xiong G, Dragutan I, Dragutan V, Ding F, Sun YG. Engineering functional group decorated ZIFs to high-performance Pd@ZIF-92 nanocatalysts for C(sp2)-C(sp2) couplings in aqueous medium. J Catal 2020. [DOI: 10.1016/j.jcat.2020.09.024] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
|
10
|
Development of Facile and Simple Processes for the Heterogeneous Pd-Catalyzed Ligand-Free Continuous-Flow Suzuki–Miyaura Coupling. Catalysts 2020. [DOI: 10.3390/catal10101209] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
The Suzuki–Miyaura coupling reaction is one of the most widely utilized C–C bond forming methods to create (hetero)biaryl scaffolds. The continuous-flow reaction using heterogeneous catalyst-packed cartridges is a practical and efficient synthetic method to replace batch-type reactions. A continuous-flow ligand-free Suzuki–Miyaura coupling reaction of (hetero)aryl iodides, bromides, and chlorides with (hetero)aryl boronic acids was developed using cartridges packed with spherical resin (tertiary amine-based chelate resin: WA30)-supported palladium catalysts (7% Pd/WA30). The void space in the cartridge caused by the spherical catalyst structures enables the smooth flow of a homogeneously dissolved reaction solution that consists of a mixture of organic and aqueous solvents and is delivered by the use of a single syringe pump. Clogging or serious backpressure was not observed.
Collapse
|
11
|
Silva RC, Villela LF, Brocksom TJ, de Oliveira KT. Direct C-H photoarylation of diazines using aryldiazonium salts and visible-light. RSC Adv 2020; 10:31115-31122. [PMID: 35520669 PMCID: PMC9056432 DOI: 10.1039/d0ra06876d] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2020] [Accepted: 08/13/2020] [Indexed: 12/17/2022] Open
Abstract
In this study, direct C–H photoarylation of pyrazine with aryldiazonium salts under visible-light irradiation (blue-LEDs) is described, and additional examples including photoarylations of pyrimidine and pyridazine are also covered. The corresponding aryl-diazines were prepared in yields up to 84% only by mixing and irradiating the reaction with no need for an additional photocatalyst. We demonstrate the efficacy of this protocol by the scope with electron-donor, -neutral, and -withdrawing groups attached at the ortho, meta, and para positions of the aryldiazonium salts; the results are better than those reported for ruthenium-complex mediated photoarylations. Additionally, we demonstrate the robustness of this methodology with a 5 mmol scaled-up experiment. Mechanistic studies were carried out giving support to the proposal of a photocatalyzed approach by an electron donor–acceptor (EDA) complex, also highlighting the crucial role that solvents play in the formation of the EDA complex. An electron donor–acceptor (EDA) approach for the direct C–H photoarylation of diazines using aryldiazonium salts and visible-light is described.![]()
Collapse
Affiliation(s)
- Rodrigo C Silva
- Departamento de Química, Universidade Federal de São Carlos São Carlos SP 13565-905 Brazil
| | - Lucas F Villela
- Departamento de Química, Universidade Federal de São Carlos São Carlos SP 13565-905 Brazil
| | - Timothy J Brocksom
- Departamento de Química, Universidade Federal de São Carlos São Carlos SP 13565-905 Brazil
| | - Kleber T de Oliveira
- Departamento de Química, Universidade Federal de São Carlos São Carlos SP 13565-905 Brazil
| |
Collapse
|
12
|
Vaaland IC, Sydnes MO. Consecutive Palladium Catalyzed Reactions in One-Pot Reactions. MINI-REV ORG CHEM 2020. [DOI: 10.2174/1570193x16666190716150048] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Combining palladium catalyzed reactions in one-pot reactions represents an efficient and
economical use of catalyst. The Suzuki-Miyaura cross-coupling has been proven to be a reaction
which can be combined with other palladium catalyzed reactions in the same pot. This mini-review
will highlight some of the latest examples where Suzuki-Miyaura cross-coupling reactions have been
combined with other palladium catalyzed reactions in one-pot reaction. Predominantly, examples
with homogeneous reaction conditions will be discussed in addition to a few examples from the authors
where Pd/C have been used as a catalyst.
Collapse
Affiliation(s)
- Ingrid Caroline Vaaland
- Department of Chemistry, Bioscience and Environmental Engineering, Faculty of Science and Technology, University of Stavanger, NO-4036 Stavanger, Norway
| | - Magne Olav Sydnes
- Department of Chemistry, Bioscience and Environmental Engineering, Faculty of Science and Technology, University of Stavanger, NO-4036 Stavanger, Norway
| |
Collapse
|
13
|
You LX, Yao SX, Zhao BB, Xiong G, Dragutan I, Dragutan V, Liu XG, Ding F, Sun YG. Striking dual functionality of a novel Pd@Eu-MOF nanocatalyst in C(sp 2)-C(sp 2) bond-forming and CO 2 fixation reactions. Dalton Trans 2020; 49:6368-6376. [PMID: 32347863 DOI: 10.1039/d0dt00770f] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Pd nanoparticles were immobilized on a highly porous, hydrothermally stable Eu-MOF via solution impregnation and H2 reduction to yield a novel Pd@Eu-MOF nanocatalyst. This composite was characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy dispersive spectroscopy (EDS), inductively coupled plasma optical emission spectroscopy (ICP-OES), powder X-ray diffraction (PXRD) and X-ray photoelectron spectroscopy (XPS). Unprecedentedly, the Pd@Eu-MOF nanocatalyst could be applied with excellent results in two strikingly different, mechanistically distinct, reactions i.e., Suzuki-Miyaura cross-coupling and cycloaddition of CO2 to a range of epoxides. Under the best reaction conditions, 98-99% yields have been attained in both catalytic processes. Moreover, in either case the heterogeneous catalyst was easily recovered and efficiently reused for more than four cycles, indicating its high stability and reproducibility. PXRD, TEM and XPS measurements on the recycled catalyst confirmed that it maintained its original structure and morphology; no Pd NP agglomeration was observed.
Collapse
Affiliation(s)
- Li-Xin You
- Key Laboratory of Inorganic Molecule-Based Chemistry of Liaoning Province, Shenyang University of Chemical Technology, Shenyang 110142, China.
| | - Shan-Xin Yao
- Key Laboratory of Inorganic Molecule-Based Chemistry of Liaoning Province, Shenyang University of Chemical Technology, Shenyang 110142, China.
| | - Bai-Bei Zhao
- Key Laboratory of Inorganic Molecule-Based Chemistry of Liaoning Province, Shenyang University of Chemical Technology, Shenyang 110142, China.
| | - Gang Xiong
- Key Laboratory of Inorganic Molecule-Based Chemistry of Liaoning Province, Shenyang University of Chemical Technology, Shenyang 110142, China.
| | - Ileana Dragutan
- Institute of Organic Chemistry, Romanian Academy, P. O. Box 35-108, Bucharest, 060023, Romania.
| | - Valerian Dragutan
- Institute of Organic Chemistry, Romanian Academy, P. O. Box 35-108, Bucharest, 060023, Romania.
| | - Xue-Gui Liu
- Institute of Functional Molecules, Shenyang University of Chemical Technology, Shenyang 110142, China
| | - Fu Ding
- Key Laboratory of Inorganic Molecule-Based Chemistry of Liaoning Province, Shenyang University of Chemical Technology, Shenyang 110142, China.
| | - Ya-Guang Sun
- Key Laboratory of Inorganic Molecule-Based Chemistry of Liaoning Province, Shenyang University of Chemical Technology, Shenyang 110142, China.
| |
Collapse
|
14
|
Cardullo N, Barresi V, Muccilli V, Spampinato G, D’Amico M, Condorelli DF, Tringali C. Synthesis of Bisphenol Neolignans Inspired by Honokiol as Antiproliferative Agents. Molecules 2020; 25:molecules25030733. [PMID: 32046220 PMCID: PMC7037512 DOI: 10.3390/molecules25030733] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2020] [Revised: 02/04/2020] [Accepted: 02/05/2020] [Indexed: 12/12/2022] Open
Abstract
Honokiol (2) is a natural bisphenol neolignan showing a variety of biological properties, including antitumor activity. Some studies pointed out 2 as a potential anticancer agent in view of its antiproliferative and pro-apoptotic activity towards tumor cells. As a further contribution to these studies, we report here the synthesis of a small library of bisphenol neolignans inspired by honokiol and the evaluation of their antiproliferative activity. The natural lead was hence subjected to simple chemical modifications to obtain the derivatives 3–9; further neolignans (12a-c, 13a-c, 14a-c, and 15a) were synthesized employing the Suzuki–Miyaura reaction, thus obtaining bisphenols with a substitution pattern different from honokiol. These compounds and the natural lead were subjected to antiproliferative assay towards HCT-116, HT-29, and PC3 tumor cell lines. Six of the neolignans show GI50 values lower than those of 2 towards all cell lines. Compounds 14a, 14c, and 15a are the most effective antiproliferative agents, with GI50 in the range of 3.6–19.1 µM, in some cases it is lower than those of the anticancer drug 5-fluorouracil. Flow cytometry experiments performed on these neolignans showed that the inhibition of proliferation is mainly due to an apoptotic process. These results indicate that the structural modification of honokiol may open the way to obtaining antitumor neolignans more potent than the natural lead.
Collapse
Affiliation(s)
- Nunzio Cardullo
- Department of Chemical Sciences, University of Catania, Viale A. Doria 6, 95125 Catania, Italy;
- Correspondence: (C.T.); (N.C.); Tel.: +39-095-7385025 (C.T.)
| | - Vincenza Barresi
- Department of Biomedical and Biotechnological Sciences, Section of Medical Biochemistry, University of Catania, Via Santa Sofia 97, 95123 Catania, Italy; (V.B.); (G.S.); (M.D.); (D.F.C.)
| | - Vera Muccilli
- Department of Chemical Sciences, University of Catania, Viale A. Doria 6, 95125 Catania, Italy;
| | - Giorgia Spampinato
- Department of Biomedical and Biotechnological Sciences, Section of Medical Biochemistry, University of Catania, Via Santa Sofia 97, 95123 Catania, Italy; (V.B.); (G.S.); (M.D.); (D.F.C.)
| | - Morgana D’Amico
- Department of Biomedical and Biotechnological Sciences, Section of Medical Biochemistry, University of Catania, Via Santa Sofia 97, 95123 Catania, Italy; (V.B.); (G.S.); (M.D.); (D.F.C.)
| | - Daniele Filippo Condorelli
- Department of Biomedical and Biotechnological Sciences, Section of Medical Biochemistry, University of Catania, Via Santa Sofia 97, 95123 Catania, Italy; (V.B.); (G.S.); (M.D.); (D.F.C.)
| | - Corrado Tringali
- Department of Chemical Sciences, University of Catania, Viale A. Doria 6, 95125 Catania, Italy;
- Correspondence: (C.T.); (N.C.); Tel.: +39-095-7385025 (C.T.)
| |
Collapse
|
15
|
Labattut A, Abi Fayssal S, Buendia J, Abdellah I, Huc V, Martini C, Schulz E. Calixarene-supported Pd–NHC complexes as efficient catalysts for scalable Suzuki–Miyaura cross-couplings. REACT CHEM ENG 2020. [DOI: 10.1039/d0re00118j] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Calixarene-supported PEPPSI-catalysts deliver high yielding and almost Pd trace-free Suzuki–Miyaura coupling products.
Collapse
Affiliation(s)
- Axel Labattut
- Université Paris-Saclay
- CNRS
- Institut de Chimie Moléculaire et des Matériaux d'Orsay
- 91405 Orsay
- France
| | - Sandra Abi Fayssal
- Université Paris-Saclay
- CNRS
- Institut de Chimie Moléculaire et des Matériaux d'Orsay
- 91405 Orsay
- France
| | | | - Ibrahim Abdellah
- Université Paris-Saclay
- CNRS
- Institut de Chimie Moléculaire et des Matériaux d'Orsay
- 91405 Orsay
- France
| | - Vincent Huc
- Université Paris-Saclay
- CNRS
- Institut de Chimie Moléculaire et des Matériaux d'Orsay
- 91405 Orsay
- France
| | | | - Emmanuelle Schulz
- Université Paris-Saclay
- CNRS
- Institut de Chimie Moléculaire et des Matériaux d'Orsay
- 91405 Orsay
- France
| |
Collapse
|
16
|
Bennett JA, Davis BA, Efimenko K, Genzer J, Abolhasani M. Network-supported, metal-mediated catalysis: progress and perspective. REACT CHEM ENG 2020. [DOI: 10.1039/d0re00229a] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
This minireview focuses on recent developments of network-supported catalysts to improve the performance of a wide range of metal-mediated catalytic reactions.
Collapse
Affiliation(s)
- Jeffrey A. Bennett
- Department of Chemical and Biomolecular Engineering
- North Carolina State University
- Raleigh
- USA
| | - Bradley A. Davis
- Department of Chemical and Biomolecular Engineering
- North Carolina State University
- Raleigh
- USA
| | - Kirill Efimenko
- Department of Chemical and Biomolecular Engineering
- North Carolina State University
- Raleigh
- USA
| | - Jan Genzer
- Department of Chemical and Biomolecular Engineering
- North Carolina State University
- Raleigh
- USA
| | - Milad Abolhasani
- Department of Chemical and Biomolecular Engineering
- North Carolina State University
- Raleigh
- USA
| |
Collapse
|
17
|
Yamada T, Ogawa A, Masuda H, Teranishi W, Fujii A, Park K, Ashikari Y, Tomiyasu N, Ichikawa T, Miyamoto R, Bai H, Matsuyama K, Nagaki A, Sajiki H. Pd catalysts supported on dual-pore monolithic silica beads for chemoselective hydrogenation under batch and flow reaction conditions. Catal Sci Technol 2020. [DOI: 10.1039/d0cy01442g] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Two different types of palladium catalysts supported on dual-pore monolithic silica beads [5% Pd/SM and 0.25% Pd/SM(sc)] for chemoselective hydrogenation were developed.
Collapse
|
18
|
Bartolomeu ADA, Silva RC, Brocksom TJ, Noël T, de Oliveira KT. Photoarylation of Pyridines Using Aryldiazonium Salts and Visible Light: An EDA Approach. J Org Chem 2019; 84:10459-10471. [DOI: 10.1021/acs.joc.9b01879] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Affiliation(s)
- Aloisio de A. Bartolomeu
- Departamento de Química, Universidade Federal de São Carlos, São Carlos, São Paulo 13565-905, Brazil
- Department of Chemical Engineering and Chemistry, Sustainable Process Engineering, Micro Flow Chemistry & Synthetic Methodology, Eindhoven University of Technology, De Rondom 70 (Helix, STO 1.37), 5612 AP Eindhoven, The Netherlands
| | - Rodrigo C. Silva
- Departamento de Química, Universidade Federal de São Carlos, São Carlos, São Paulo 13565-905, Brazil
| | - Timothy J. Brocksom
- Departamento de Química, Universidade Federal de São Carlos, São Carlos, São Paulo 13565-905, Brazil
| | - Timothy Noël
- Department of Chemical Engineering and Chemistry, Sustainable Process Engineering, Micro Flow Chemistry & Synthetic Methodology, Eindhoven University of Technology, De Rondom 70 (Helix, STO 1.37), 5612 AP Eindhoven, The Netherlands
| | - Kleber T. de Oliveira
- Departamento de Química, Universidade Federal de São Carlos, São Carlos, São Paulo 13565-905, Brazil
| |
Collapse
|
19
|
Yamada T, Kobayashi Y, Ito N, Ichikawa T, Park K, Kunishima K, Ueda S, Mizuno M, Adachi T, Sawama Y, Monguchi Y, Sajiki H. Polyethyleneimine-Modified Polymer as an Efficient Palladium Scavenger and Effective Catalyst Support for a Functional Heterogeneous Palladium Catalyst. ACS OMEGA 2019; 4:10243-10251. [PMID: 31460116 PMCID: PMC6649293 DOI: 10.1021/acsomega.9b00707] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/13/2019] [Accepted: 05/31/2019] [Indexed: 05/27/2023]
Abstract
The polyethyleneimine-modified polymers, polystyrene-divinylbenzene-based (TAs) and polymethacrylate-based polymers (TAm), were used as palladium scavengers to eliminate residual palladium species after palladium on carbon-catalyzed Sonogashira-type coupling reaction. Since both TAs and TAm indicated relatively favorable elimination abilities toward residual palladium species in the reaction mixture, the affinities of TAs and TAm for palladium species were used as supports for palladium catalysts. The TAm-supported palladium catalyst (Pd/TAm) indicated better catalyst properties for the chemoselective hydrogenation compared to those of the corresponding TAs-supported palladium catalyst (Pd/TAs). Aromatic benzyl ethers; aromatic and aliphatic N-Cbzs; and aromatic carbonyl groups were smoothly hydrogenated in the presence of 1-5 mol % of Pd/TAm in MeOH or 2-PrOH. In contrast, the hydrogenation of aromatic ketones was selectively suppressed in morpholine which act as appropriate catalyst poison and solvent. Furthermore, Pd/TAm-catalyzed chemoselective hydrogenation was applicable to continuous-flow reaction.
Collapse
Affiliation(s)
- Tsuyoshi Yamada
- Laboratory
of Organic Chemistry, Gifu Pharmaceutical
University, 1-25-4 Daigaku-nishi, Gifu 501-1196, Japan
| | - Yutaka Kobayashi
- Laboratory
of Organic Chemistry, Gifu Pharmaceutical
University, 1-25-4 Daigaku-nishi, Gifu 501-1196, Japan
| | - Naoya Ito
- Laboratory
of Organic Chemistry, Gifu Pharmaceutical
University, 1-25-4 Daigaku-nishi, Gifu 501-1196, Japan
| | - Tomohiro Ichikawa
- Laboratory
of Organic Chemistry, Gifu Pharmaceutical
University, 1-25-4 Daigaku-nishi, Gifu 501-1196, Japan
| | - Kwihwan Park
- Laboratory
of Organic Chemistry, Gifu Pharmaceutical
University, 1-25-4 Daigaku-nishi, Gifu 501-1196, Japan
| | - Kouki Kunishima
- Laboratory
of Organic Chemistry, Gifu Pharmaceutical
University, 1-25-4 Daigaku-nishi, Gifu 501-1196, Japan
| | - Shun Ueda
- Laboratory
of Organic Chemistry, Gifu Pharmaceutical
University, 1-25-4 Daigaku-nishi, Gifu 501-1196, Japan
| | - Masahiro Mizuno
- Laboratory
of Organic Chemistry, Gifu Pharmaceutical
University, 1-25-4 Daigaku-nishi, Gifu 501-1196, Japan
| | - Tadashi Adachi
- Separation
Materials Group, Functional Organic Materials Laboratory, Fukuoka
R&D Center, Mitsubishi Chemical Corporation, 1-1 Kurosaki-Shiroishi, Yahatanishi-ku, Kitakyushu-shi, Fukuoka 806-0004, Japan
| | - Yoshinari Sawama
- Laboratory
of Organic Chemistry, Gifu Pharmaceutical
University, 1-25-4 Daigaku-nishi, Gifu 501-1196, Japan
| | - Yasunari Monguchi
- Laboratory
of Organic Chemistry, Daiichi University
of Pharmacy, 22-1 Tamagawa-cho, Minami-ku, Fukuoka 815-8511, Japan
| | - Hironao Sajiki
- Laboratory
of Organic Chemistry, Gifu Pharmaceutical
University, 1-25-4 Daigaku-nishi, Gifu 501-1196, Japan
| |
Collapse
|
20
|
Facile synthesis of palladium nanoparticles immobilized on magnetic biodegradable microcapsules used as effective and recyclable catalyst in Suzuki-Miyaura reaction and p-nitrophenol reduction. Carbohydr Polym 2019; 222:115029. [PMID: 31320097 DOI: 10.1016/j.carbpol.2019.115029] [Citation(s) in RCA: 75] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2019] [Revised: 06/13/2019] [Accepted: 06/25/2019] [Indexed: 12/15/2022]
Abstract
This study reports (i) preparation and characterization of palladium nanoparticles (Pd NPs) stabilized on magnetically separable chitosan/agar microcapsules (Pd NPs@Fe3O4/CS-AG microcapsules) and (ii) investigation of catalytic behaviors of the prepared nanoparticles in Suzuki-Miyaura C-C cross-coupling reactions and reduction of p-nitrophenol (p-NP). Fourier transforms infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), X-ray diffraction (XRD), elemental mapping, inductively coupled plasma-optical emission spectrometry (ICP-OES) and thermogravimetry/derivative thermogravimetry (TG/DTG) techniques were used for analyzing the Pd NPs@Fe3O4/CS-AG microcapsules. Characterization studies showed that Pd NPs@Fe3O4/CS-AG microcapsules were successfully synthesized and the size of the particles was in the range of 28-39 nm. Pd NPs@Fe3O4/CS-AG microcapsules displayed highly effective catalytic performance in the conversion of various aryl halides into the corresponding biaryl derivatives by Suzuki-Miyaura reaction under solvent-free conditions in 5 min. Pd NPs@Fe3O4/CS-AG microcapsules were also successfully employed in p-NP reduction to p-aminophenol (p-AP) in water at room temperature in 180 s. Moreover, reproducibility studies showed that Pd NPs@Fe3O4/CS-AG microcapsules were highly efficient and could be used many times in both catalytic reactions due to their magnetically separable nature. According to the results of this work, Pd NPs@Fe3O4/CS-AG microcapsules are highly efficient, economical, practical and environmentally superb catalysts for Suzuki-Miyaura reaction and p-NP reduction.
Collapse
|
21
|
Development of Titanium Dioxide-Supported Pd Catalysts for Ligand-Free Suzuki–Miyaura Coupling of Aryl Chlorides. Catalysts 2019. [DOI: 10.3390/catal9050461] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
The catalyst activities of various heterogeneous palladium catalysts supported by anatase-, rutile- and brookite-type titanium oxide for ligand-free Suzuki–Miyaura cross-coupling reactions of aryl chlorides were evaluated. Palladium acetate [Pd(OAc)2], supported on anatase-type titanium oxide (TiO2) via acetonitrile solution impregnation process without reduction [Pd/TiO2 (anatase-type)], demonstrated the highest catalyst activity in comparison to those of other titanium oxide (rutile- or brookite-type) supported Pd(OAc)2 without reduction and reduced Pd/TiO2 (anatase-type) [Pd(red)/TiO2 (anatase-type)]. Various aryl chloride and bromide derivatives were smoothly coupled with arylboronic acids including heteroarylboronic acids in the presence of 5–10 mol% Pd/TiO2 (anatase-type) without the addition of any ligands. Although the fresh Pd/TiO2 (anatase-type) catalyst was surprisingly comprised of ca. 1:2 mixture of palladium(II) and palladium(0) species according to X-ray photoelectron spectroscopy (XPS), in spite of no reduction process, significant further increment of palladium(0) species was observed during the Suzuki–Miyaura coupling reaction, and Pd/TiO2 (anatase-type) was converted into a catalyst, which contained palladium(0) species as the main component [ca. 1:5 mixture of palladium(II) and palladium(0) species]. Therefore, the reduction via the electron donation process to the palladium(II) species may have occurred during the reaction on anatase-type titanium oxide.
Collapse
|
22
|
Ichitsuka T, Suzuki N, Sairenji M, Koumura N, Onozawa S, Sato K, Kobayashi S. Readily Available Immobilized Pd Catalysts for Suzuki‐Miyaura Coupling under Continuous‐flow Conditions. ChemCatChem 2019. [DOI: 10.1002/cctc.201900085] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Tomohiro Ichitsuka
- Interdisciplinary Research Center for Catalytic ChemistryNational Institute of Advanced Industrial Science and Technology Central 5, Higashi 1-1-1 Tsukuba, Ibaraki 305-8565 Japan
| | - Naoto Suzuki
- Interdisciplinary Research Center for Catalytic ChemistryNational Institute of Advanced Industrial Science and Technology Central 5, Higashi 1-1-1 Tsukuba, Ibaraki 305-8565 Japan
| | - Masaki Sairenji
- Interdisciplinary Research Center for Catalytic ChemistryNational Institute of Advanced Industrial Science and Technology Central 5, Higashi 1-1-1 Tsukuba, Ibaraki 305-8565 Japan
| | - Nagatoshi Koumura
- Interdisciplinary Research Center for Catalytic ChemistryNational Institute of Advanced Industrial Science and Technology Central 5, Higashi 1-1-1 Tsukuba, Ibaraki 305-8565 Japan
| | - Shun‐ya Onozawa
- Interdisciplinary Research Center for Catalytic ChemistryNational Institute of Advanced Industrial Science and Technology Central 5, Higashi 1-1-1 Tsukuba, Ibaraki 305-8565 Japan
| | - Kazuhiko Sato
- Interdisciplinary Research Center for Catalytic ChemistryNational Institute of Advanced Industrial Science and Technology Central 5, Higashi 1-1-1 Tsukuba, Ibaraki 305-8565 Japan
| | - Shū Kobayashi
- Interdisciplinary Research Center for Catalytic ChemistryNational Institute of Advanced Industrial Science and Technology Central 5, Higashi 1-1-1 Tsukuba, Ibaraki 305-8565 Japan
- Department of Chemistry, School of ScienceThe University of Tokyo Hongo, Bunkyo-ku, Tokyo 113-0033 Japan
| |
Collapse
|
23
|
Abstract
A critical review of conclusions about the putative heterogeneous mechanism in the Suzuki-Miyaura coupling by supported Pd solids is reported. In the first section, the turnover frequencies (TOF) of 20 well-established homogeneous catalysts are shown to be in the range 200 to 1,000,000,000 h − 1 . The evidences used to prove a heterogeneous mechanism are discussed and another interpretation is proposed, hypothesizing that only the leached species are responsible for the catalytic reaction, even at ppb levels. Considering more than 40 published catalytic systems for which liquid phase Pd content have been reported, activities have been computed based on leached Pd concentrations and are shown to be in the range TOF 150 to 70,000,000 h − 1 . Such values are compatible with those found for the well-established homogeneous catalysts which questions the validity of the conclusions raised by many papers about the heterogeneous (solid) nature of Suzuki-Miyaura catalysis. Last, a tentative methodology is proposed which involves the rational use of well-known tests (hot-filtration test, mercury test…) to help to discriminate between homogeneous and heterogeneous mechanisms.
Collapse
|
24
|
Barham JP, Koyama E, Norikane Y, Ohneda N, Yoshimura T. Microwave Flow: A Perspective on Reactor and Microwave Configurations and the Emergence of Tunable Single‐Mode Heating Toward Large‐Scale Applications. CHEM REC 2018; 19:188-203. [DOI: 10.1002/tcr.201800104] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2018] [Accepted: 10/17/2018] [Indexed: 11/06/2022]
Affiliation(s)
- Joshua P. Barham
- Electronics and Photonics Research InstituteNational Institute of Advanced Industrial Science and Technology Tsukuba Central 5, 1-1-1 Higashi Tsukuba, Ibaraki 305-8568 Japan
| | - Emiko Koyama
- Electronics and Photonics Research InstituteNational Institute of Advanced Industrial Science and Technology Tsukuba Central 5, 1-1-1 Higashi Tsukuba, Ibaraki 305-8568 Japan
| | - Yasuo Norikane
- Electronics and Photonics Research InstituteNational Institute of Advanced Industrial Science and Technology Tsukuba Central 5, 1-1-1 Higashi Tsukuba, Ibaraki 305-8568 Japan
| | - Noriyuki Ohneda
- SAIDA FDS, INC. 143-10 Isshiki Yaizu, Shizuoka 425-0054 Japan
| | - Takeo Yoshimura
- SAIDA FDS, INC. 143-10 Isshiki Yaizu, Shizuoka 425-0054 Japan
| |
Collapse
|
25
|
Monguchi Y, Ichikawa T, Yamada T, Sawama Y, Sajiki H. Continuous-Flow Suzuki-Miyaura and Mizoroki-Heck Reactions under Microwave Heating Conditions. CHEM REC 2018; 19:3-14. [PMID: 30182484 DOI: 10.1002/tcr.201800063] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2018] [Accepted: 08/17/2018] [Indexed: 01/11/2023]
Abstract
Microwave-assisted continuous-flow reactions have attracted significant interest from synthetic organic chemists, especially process chemists from practical points of view, due to a less complicated shift to large-scale synthesis based on simple and continuous access to products with low energy requirements. In this personal account, we focused on the Suzuki-Miyaura and Mizoroki-Heck reactions, both of which are significantly important cross-coupling reactions for the synthesis of various functional materials. Microwave power is effective for heating. Typical homogeneous palladium catalysts, such as PdCl2 (PPh3 )2 , Pd(PPh3 )4 , and Pd(OAc)2 , as well as heterogeneous palladium catalysts, such as Pd-film, Pd/Al2 O3 , Pd/SiO2 , and Pd supported on polymers, can be used for these reactions.
Collapse
Affiliation(s)
- Yasunari Monguchi
- Laboratory of Organic Chemistry, Gifu Pharmaceutical University, 1-25-4 Daigaku-nishi, Gifu, 501-1196, Japan.,Laboratory of Organic Chemistry, Daiichi University of Pharmacy, 22-1 Tamagawa-cho, Minami-ku, Fukuoka, 815-8511, Japan
| | - Tomohiro Ichikawa
- Laboratory of Organic Chemistry, Gifu Pharmaceutical University, 1-25-4 Daigaku-nishi, Gifu, 501-1196, Japan
| | - Tsuyoshi Yamada
- Laboratory of Organic Chemistry, Gifu Pharmaceutical University, 1-25-4 Daigaku-nishi, Gifu, 501-1196, Japan
| | - Yoshinari Sawama
- Laboratory of Organic Chemistry, Gifu Pharmaceutical University, 1-25-4 Daigaku-nishi, Gifu, 501-1196, Japan
| | - Hironao Sajiki
- Laboratory of Organic Chemistry, Gifu Pharmaceutical University, 1-25-4 Daigaku-nishi, Gifu, 501-1196, Japan
| |
Collapse
|
26
|
Synthesis and characterization of Pd-γ-Fe2O3 nanocomposite and its application as a magnetically recyclable catalyst in ligand-free Suzuki-Miyaura reaction in water. J Organomet Chem 2018. [DOI: 10.1016/j.jorganchem.2018.06.016] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
|
27
|
Xiong G, Chen XL, You LX, Ren BY, Ding F, Dragutan I, Dragutan V, Sun YG. La-Metal-Organic Framework incorporating Fe3O4 nanoparticles, post-synthetically modified with Schiff base and Pd. A highly active, magnetically recoverable, recyclable catalyst for C C cross-couplings at low Pd loadings. J Catal 2018. [DOI: 10.1016/j.jcat.2018.02.026] [Citation(s) in RCA: 61] [Impact Index Per Article: 10.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
|
28
|
A practical method for heterogeneously-catalyzed Mizoroki–Heck reaction: Flow system with adjustment of microwave resonance as an energy source. Tetrahedron 2018. [DOI: 10.1016/j.tet.2018.02.044] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
|