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Rawat V, Vigalok A, Sinha AK, Sachdeva G, Srivastava CM, Rao GK, Kumar A, Singh M, Rathi K, Verma VP, Yadav B, Pandey AK, Vats M. Synthesis of a Zirconium Complex of an N, O-type p- tert-Butylcalix[4]arene and Its Application in Some Multicomponent Reactions. ACS OMEGA 2022; 7:28471-28480. [PMID: 35990458 PMCID: PMC9386809 DOI: 10.1021/acsomega.2c03187] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/22/2022] [Accepted: 07/22/2022] [Indexed: 06/15/2023]
Abstract
The synthesis and characterization of a new octahedral Zr(IV) complex of oxygen-depleted N,O-type calixarene ligand comprising two distal-functionalized pyrazole rings have been reported. The cone shape and structure of the prepared complex were confirmed univocally by single-crystal X-ray diffraction and NMR studies. The Zr metal lies at 2.091 Å from the plane of the calixarene ring. This complex has been utilized as an efficient catalyst for the synthesis of Biginelli adducts, bis(indolyl)methanes, and coumarins. This complex (Cl2Zr-calixarene) showed superior activity for these multicomponent reactions in comparison to the corresponding Ti(IV) and Zn(II) analogues. Ferrocene-appended bis(indolyl)methane, prepared using this catalyst, was also evaluated for its anticancer activity against the A-172 cell line.
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Affiliation(s)
- Varun Rawat
- Amity
School of Applied Sciences, Amity University
Haryana, Gurugram 122413, India
- School
of Chemistry, Faculty of Exact Sciences, Tel Aviv University, Tel Aviv 6997801, Israel
| | - Arkadi Vigalok
- School
of Chemistry, Faculty of Exact Sciences, Tel Aviv University, Tel Aviv 6997801, Israel
| | - Anshu Kumar Sinha
- Amity
School of Applied Sciences, Amity University
Haryana, Gurugram 122413, India
| | - Garima Sachdeva
- Amity
School of Applied Sciences, Amity University
Haryana, Gurugram 122413, India
| | | | - Gyandshwar K. Rao
- Amity
School of Applied Sciences, Amity University
Haryana, Gurugram 122413, India
| | - Arun Kumar
- Department
of Chemistry, School of Physical Sciences, Doon University, Dehradun 248012, Uttarakhand, India
| | - Mandeep Singh
- Nuchem
Sciences, Saint-Laurent, Quebec H4R2N6, Canada
| | - Komal Rathi
- Department
of Chemistry, Banasthali University, Banasthali Newai 304002, Rajasthan, India
| | - Ved Prakash Verma
- Department
of Chemistry, Banasthali University, Banasthali Newai 304002, Rajasthan, India
| | - Bhupender Yadav
- Amity Institute
of Biotechnology, Amity University Haryana, Gurugram 122413, India
| | - Amit Kumar Pandey
- Amity Institute
of Biotechnology, Amity University Haryana, Gurugram 122413, India
| | - Monika Vats
- Amity
School of Applied Sciences, Amity University
Haryana, Gurugram 122413, India
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Two coordination polymers based on p-tert-butylcalix[4]arene as efficient luminescent sensor for Fe3+ and MnO4− ions. INORG CHEM COMMUN 2020. [DOI: 10.1016/j.inoche.2020.108290] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
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Kunert R, Philouze C, Berthiol F, Jarjayes O, Storr T, Thomas F. Distorted copper(ii) radicals with sterically hindered salens: electronic structure and aerobic oxidation of alcohols. Dalton Trans 2020; 49:12990-13002. [PMID: 32909589 DOI: 10.1039/d0dt02524k] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The sterically hindered salen ligands featuring biphenyl and tetramethyl putrescine linkers were synthesized and chelated to copper. The resulting complexes CuLbp,tBu, CuLbp,OMe, CuLpu,tBu and CuLpu,OMe were structurally characterized, showing a significanty tetrahedrally distorted metal center. The complexes show two reversible oxidation waves in the range 0.2 to 0.8 V vs. Fc+/Fc. A further reduction wave is detected in the range -1.4 to -1.7 V vs. Fc+/Fc. It is reversible for CuLbp,tBu and CuLbp,OMe and assigned to the CuII/CuI redox couple. One-electron oxidation of CuLbp,OMe, CuLpu,tBu and CuLpu,OMe was performed chemically and electrochemically. It is accompanied by a quenching of the EPR resonances. Phenoxyl radical formation was established by X-Ray diffraction on the cations [CuLbp,OMe]+ and [CuLpu,OMe]+, whereby the coordination sphere is elongated upon oxidation with quinoidal distributions of bond distances. The cations exhibit a NIR band of moderate intensity in their optical spectrum, supporting their classification as class II mixed-valent radical species according to the Robin Day classification. The proposed electronic structures are supported by DFT calculations. The cations [CuLbp,OMe]+, [CuLpu,tBu]+ and [CuLpu,OMe]+ were active towards aerobic oxidation of the unactivated alcohol 2-phenylethanol, with TON numbers up to 58 within 3 h.
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Affiliation(s)
- R Kunert
- Univ. Grenoble Alpes, CNRS, DCM, 38000 Grenoble, France.
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Keck M, Hoof S, Rawat V, Vigalok A, Limberg C. The Coordination Behavior of Oxygen‐depleted Calixarenes towards d
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Noble Metal Ions. Z Anorg Allg Chem 2020. [DOI: 10.1002/zaac.202000138] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Matthias Keck
- Institut für Chemie Humboldt‐Universität zu Berlin Brook‐Taylor‐Str. 2 12489 Berlin Germany
| | - Santina Hoof
- Institut für Chemie Humboldt‐Universität zu Berlin Brook‐Taylor‐Str. 2 12489 Berlin Germany
| | - Varun Rawat
- School of Chemistry Tel Aviv University 1 Ramat Aviv 69978 Tel Aviv Israel
| | - Arkadi Vigalok
- School of Chemistry Tel Aviv University 1 Ramat Aviv 69978 Tel Aviv Israel
| | - Christian Limberg
- Institut für Chemie Humboldt‐Universität zu Berlin Brook‐Taylor‐Str. 2 12489 Berlin Germany
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Keck M, Hoof S, Herwig C, Vigalok A, Limberg C. Oxygen-Depleted Calixarenes as Ligands for Molecular Models of Galactose Oxidase. Chemistry 2019; 25:13285-13289. [PMID: 31441974 PMCID: PMC6857004 DOI: 10.1002/chem.201903820] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2019] [Indexed: 11/10/2022]
Abstract
A calix[4]arene ligand, in which two of the phenol functions are replaced by pyrazole units has been employed to mimic the His2 -Tyr2 (His: histidine, Tyr: tyrosine) ligand sphere within the active site of the galactose oxidase (GO). The calixarene backbone forces the corresponding copper(II) complex into a see-saw-type structure, which is hitherto unprecedented in GO modelling chemistry. It undergoes a one-electron oxidation that is centered at the phenolate donor leading to a copper-coordinated phenoxyl radical like in the GO. Accordingly, the complex was tested as a functional model and indeed proved capable of oxidizing benzyl alcohol to the respective aldehyde using two phenoxyl-radical equivalents as oxidants. Finally, the results show that the calixarene platform can be utilized to arrange donor functions to biomimetic binding pockets that allow for the creation of novel types of model compounds.
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Affiliation(s)
- Matthias Keck
- Institut für ChemieHumboldt-Universität zu BerlinBrook-Taylor-Strasse 212489BerlinGermany
| | - Santina Hoof
- Institut für ChemieHumboldt-Universität zu BerlinBrook-Taylor-Strasse 212489BerlinGermany
| | - Christian Herwig
- Institut für ChemieHumboldt-Universität zu BerlinBrook-Taylor-Strasse 212489BerlinGermany
| | - Arkadi Vigalok
- School of ChemistryTel Aviv University1 Ramat Aviv69978Tel AvivIsrael
| | - Christian Limberg
- Institut für ChemieHumboldt-Universität zu BerlinBrook-Taylor-Strasse 212489BerlinGermany
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