Journal Description
Molbank
Molbank
is an international, peer-reviewed, open access journal comprised of a unique collection of one-compound-per-paper short notes on synthetic compounds and natural products published quarterly online by MDPI.
- Open Access— free for readers, with article processing charges (APC) paid by authors or their institutions.
- High Visibility: indexed within Scopus, ESCI (Web of Science), Reaxys, CAPlus / SciFinder, and other databases.
- Rapid Publication: manuscripts are peer-reviewed and a first decision is provided to authors approximately 15.5 days after submission; acceptance to publication is undertaken in 2.6 days (median values for papers published in this journal in the second half of 2023).
- Recognition of Reviewers: reviewers who provide timely, thorough peer-review reports receive vouchers entitling them to a discount on the APC of their next publication in any MDPI journal, in appreciation of the work done.
Impact Factor:
0.6 (2022)
Latest Articles
Chloro(η2,η2-Cycloocta-1,5-Diene){1-[(2-[(S)-1-(Hydroxymethyl)-3-Methylbutyl]Amino)-2-Oxoethyl]-3-(1-Naphthalenylmethyl)Benzimidazol-2-Ylidene}Rhodium(I)
Molbank 2024, 2024(2), M1810; https://doi.org/10.3390/M1810 - 19 Apr 2024
Abstract
Commercially available and air- and moisture-stable rhodium complex [Rh(OH)(cod)]2 (2) was utilized in the synthesis of [RhX(cod)(NHC)] (3). The presence of an OH group in complex 2 serves as an internal base, facilitating the deprotonation of the C–H
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Commercially available and air- and moisture-stable rhodium complex [Rh(OH)(cod)]2 (2) was utilized in the synthesis of [RhX(cod)(NHC)] (3). The presence of an OH group in complex 2 serves as an internal base, facilitating the deprotonation of the C–H bond of the azolium ring in the hydroxyamide-substituted benzimidazolium salt 1. This reaction between 1 and 2 proceeded in THF at room temperature without temperature control, affording the desired NHC/Rh complex 3 in excellent yield. The characterization of complex 3 was accomplished through NMR and HRMS analyses, revealing its existence as a diastereomeric mixture of two NHC/Rh complexes. Furthermore, its catalytic performance was briefly evaluated in the reaction between 2-naphthaldehyde (5) and phenylboronic acid (6).
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(This article belongs to the Topic Heterocyclic Carbene Catalysis)
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Chloro(η2,η2-cycloocta-1,5-diene){1-benzyl-3-[(S)-2-hydroxy-1-methylethyl]benzimidazol-2-ylidene}rhodium(I)
by
Satoshi Sakaguchi and Shogo Matsuo
Molbank 2024, 2024(2), M1811; https://doi.org/10.3390/M1811 - 19 Apr 2024
Abstract
Previously, we demonstrated the synthesis of a well-defined hydroxyalkyl-functionalized N-heterocyclic carbene (NHC)/Ru(II) complex through the transmetalation reaction between [RuCl2(p-cymene)]2 and the corresponding NHC/Ag(I) complex derived from a chiral benzimidazolium salt using the Ag2O method. In
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Previously, we demonstrated the synthesis of a well-defined hydroxyalkyl-functionalized N-heterocyclic carbene (NHC)/Ru(II) complex through the transmetalation reaction between [RuCl2(p-cymene)]2 and the corresponding NHC/Ag(I) complex derived from a chiral benzimidazolium salt using the Ag2O method. In this study, we successfully synthesized [RhX(cod)(NHC)] complexes through a one-pot deprotonation route. The hydroxyalkyl-substituted benzimidazolium salt reacted with [Rh(OH)(cod)]2 in THF at room temperature, affording the corresponding monodentate NHC/Rh(I) complex in nearly quantitative yield. The rhodium complex was characterized using NMR, HRMS measurement, and elemental analysis.
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(This article belongs to the Topic Heterocyclic Carbene Catalysis)
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Open AccessShort Note
Diiodido-bis{N-[2-(diphenylphosphino)benzylidene]benzylamine-κ2N,P}dicopper(I)
by
Julian Süß, Uwe Monkowius and Manfred Zabel
Molbank 2024, 2024(2), M1808; https://doi.org/10.3390/M1808 - 18 Apr 2024
Abstract
The one-pot template reaction between 2-(diphenylphosphino)benzaldehyde, benzylamine and copper(I) iodide yields the dinuclear copper complex (P∩N)2Cu2I2, as revealed by single-crystal X-ray diffraction.
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(This article belongs to the Section Structure Determination)
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1-(3-Chlorophenyl)-3-(6-((1,7,7-trimethylbicyclo[2.2.1]heptan-2-ylidene)amino)hexyl)thiourea
by
Daria Zapravdina and Vladimir Burmistrov
Molbank 2024, 2024(2), M1809; https://doi.org/10.3390/M1809 - 18 Apr 2024
Abstract
The compound 1-(3-chlorophenyl)-3-(6-((1,7,7-trimethylbicyclo[2.2.1]heptan-2-ylidene)amino)hexyl)thiourea was synthesized for the first time from 6-((1,7,7-trimethylbicyclo[2.2.1]heptan-2-ylidene)amino)hexan-1-amine and 3-chlorophenylisothiocyanate in DMF with a 60% yield. It was characterized by 1H, 13C{1H} NMR, FT-IR, MS, and elemental analysis.
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(This article belongs to the Section Organic Synthesis)
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Open AccessShort Note
3,3’-(4,11-Bis(4-(trifluoromethyl)benzyl)-1,4,8,11-Tetraazacyclotetradecane-1,8-diyl)dipropanenitrile
by
Inês M. Nunes, Elisabete R. Silva and Luis G. Alves
Molbank 2024, 2024(2), M1807; https://doi.org/10.3390/M1807 - 17 Apr 2024
Abstract
The cyclam derivative (NCCH2CH2)2(4-CF3PhCH2)2Cyclam was prepared by the reaction of H2(4-CF3PhCH2)2Cyclam with acrylonitrile in methanol. The compound was fully characterized by elemental analysis,
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The cyclam derivative (NCCH2CH2)2(4-CF3PhCH2)2Cyclam was prepared by the reaction of H2(4-CF3PhCH2)2Cyclam with acrylonitrile in methanol. The compound was fully characterized by elemental analysis, mass spectrometry as well as IR and NMR spectroscopy. Crystals of (NCCH2CH2)2(4-CF3PhCH2)2Cyclam suitable for single-crystal X-ray diffraction were obtained by the slow evaporation of a chloroform solution of the compound. The establishment of non-classical hydrogen bonds and unusual nitrile–nitrile and π(CN)…π interactions determined the solid-state supramolecular architecture of (NCCH2CH2)2(4-CF3PhCH2)2Cyclam.
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(This article belongs to the Section Structure Determination)
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Open AccessCommunication
Synthesis and Analytical Characterization of Cyclization Products of 3-Propargyloxy-5-benzyloxy-benzoic Acid Methyl Ester
by
Matteo Mori, Giulia Cazzaniga, Donatella Nava and Elena Pini
Molbank 2024, 2024(2), M1806; https://doi.org/10.3390/M1806 - 16 Apr 2024
Abstract
In the context of our ongoing studies on chromane derivatives as inhibitors of the salicylate synthase from M. tuberculosis, we isolated a new, unexpected compound from the cyclization of 3-(propargyloxy)-5-benzyloxy-benzoic acid methyl ester. Its molecular structure was elucidated by means of 1D
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In the context of our ongoing studies on chromane derivatives as inhibitors of the salicylate synthase from M. tuberculosis, we isolated a new, unexpected compound from the cyclization of 3-(propargyloxy)-5-benzyloxy-benzoic acid methyl ester. Its molecular structure was elucidated by means of 1D and 2D NMR analyses, FT-IR, ESI-MS, and HRMS.
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(This article belongs to the Collection Molecules from Side Reactions)
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Open AccessCommunication
The Synthesis and Structure of Scandium Dichloride of Sterically Demanding Aminopyridinato Ligands
by
Sadaf Qayyum
Molbank 2024, 2024(2), M1805; https://doi.org/10.3390/M1805 - 10 Apr 2024
Abstract
The reaction of the potassium salt of (2,6-diisopropylphenyl)-[6-(2,4,6-triisopropylphenyl)-pyridine-2-yl]-amine (Ap*H) with the equimolar ratio of [ScCl3] in tetrahydrofuran (thf) resulted in the mononuclear mono(aminopyridinato) scandium dichloride complex [Ap*ScCl2(thf)2]. An X-ray analysis showed the title compound to be monomeric.
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The reaction of the potassium salt of (2,6-diisopropylphenyl)-[6-(2,4,6-triisopropylphenyl)-pyridine-2-yl]-amine (Ap*H) with the equimolar ratio of [ScCl3] in tetrahydrofuran (thf) resulted in the mononuclear mono(aminopyridinato) scandium dichloride complex [Ap*ScCl2(thf)2]. An X-ray analysis showed the title compound to be monomeric. The compound [C40H59Cl2N2O2Sc] crystallized in the monoclinic space group, P21/n, and possessed the following cell parameters: a = 12.4441(8) b = 22.9975(10) c = 13.9971(8) Å, β = 92.297(5)°, V = 4002.5(4) A3, and Z = 4. Hirshfeld analyses show that H…H (91.1%), H…C/C…H (5.0%), and H…Cl/Cl…H (3.9%) are the contributing interactions in the solid-state structure. The compound was further characterized by NMR spectroscopy, and its purity was confirmed by elemental analysis.
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(This article belongs to the Section Structure Determination)
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Supplementary material:
Supplementary File 1 (PDF, 2182 KiB)
Supplementary File 2 (MOL, 2 KiB)
Supplementary File 3 (INCHI, 593 B)
Supplementary File 4 (MOL, 2 KiB)
Supplementary File 5 (MOL, 2 KiB)
Supplementary File 6 (INCHI, 594 B)
Supplementary File 7 (MOL, 2 KiB)
Supplementary File 8 (MOL, 1 KiB)
Supplementary File 9 (INCHI, 365 B)
Supplementary File 10 (MOL, 1 KiB)
Supplementary File 1 (PDF, 2182 KiB)
Supplementary File 2 (MOL, 2 KiB)
Supplementary File 3 (INCHI, 593 B)
Supplementary File 4 (MOL, 2 KiB)
Supplementary File 5 (MOL, 2 KiB)
Supplementary File 6 (INCHI, 594 B)
Supplementary File 7 (MOL, 2 KiB)
Supplementary File 8 (MOL, 1 KiB)
Supplementary File 9 (INCHI, 365 B)
Supplementary File 10 (MOL, 1 KiB)
Open AccessShort Note
1,2-Dibenzoylthiosemicarbazide
by
Burcă Ion, Badea Valentin, Todea Anamaria and Bercean Vasile-Nicolae
Molbank 2024, 2024(2), M1804; https://doi.org/10.3390/M1804 - 09 Apr 2024
Abstract
When 1-benzoylthiosemicarbazide (2) or thiosemicarbazide (1) were treated with benzoyl chloride in a basic medium, a mixture of two compounds was obtained: 1,2-dibenzoylthiosemicarbazide (3) and 1,4-dibenzoylthiosemicarbazide (4). To determine the structure of the novel compounds,
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When 1-benzoylthiosemicarbazide (2) or thiosemicarbazide (1) were treated with benzoyl chloride in a basic medium, a mixture of two compounds was obtained: 1,2-dibenzoylthiosemicarbazide (3) and 1,4-dibenzoylthiosemicarbazide (4). To determine the structure of the novel compounds, 2D NMR spectroscopy techniques such as 1H-13C and 1H-15N were employed.
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(This article belongs to the Collection Molecules from Side Reactions)
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Benzo[d][1,2,3]oxadithiole 2-Oxide
by
R. Alan Aitken, David B. Cordes, Arun Goyal and Aidan P. McKay
Molbank 2024, 2024(2), M1803; https://doi.org/10.3390/M1803 - 07 Apr 2024
Abstract
A simplified synthesis of the title compound is reported and its 1H and 13C NMR data are fully assigned including determination of H–H and C–H coupling constants. Its X-ray structure has been determined for the first time. NMR data are also
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A simplified synthesis of the title compound is reported and its 1H and 13C NMR data are fully assigned including determination of H–H and C–H coupling constants. Its X-ray structure has been determined for the first time. NMR data are also presented for the oxygen analogue.
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(This article belongs to the Section Structure Determination)
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(2R,4aS,6aS,12bR,14aS,14bR)-N-(2-(2-(2-(2-Azidoethoxy)ethoxy)ethoxy)ethyl)-10-hydroxy-2,4a,6a,9,12b,14a-hexamethyl-11-oxo-1,2,3,4,4a,5,6,6a,11,12b,13,14,14a,14b-tetradecahydropicene-2-carboxamide
by
Guo Yuzhu, Margrate Anyanwu, Xiao Yang, Ren Zimo, Alessandra Gianoncelli, Giovanni Ribaudo and Paolo Coghi
Molbank 2024, 2024(2), M1800; https://doi.org/10.3390/M1800 - 01 Apr 2024
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In this report, we discuss the synthesis of a compound obtained from the derivatization of the natural compound celastrol. This derivative is connected to PEG azide moiety through an amide linkage. The linkage was achieved through the activation of the carboxylic acid using
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In this report, we discuss the synthesis of a compound obtained from the derivatization of the natural compound celastrol. This derivative is connected to PEG azide moiety through an amide linkage. The linkage was achieved through the activation of the carboxylic acid using HOBt/EDC. The compound was fully characterized by proton (1H), carbon-13 (13C), heteronuclear single quantum coherence (HSQC), correlation spectroscopy (1H-1H-COSY), and distortionless enhancement by polarization transfer (DEPT) NMR. Ultraviolet (UV), Fourier-transform infrared (FTIR), and high-resolution mass spectrometry (HRMS) were also adopted. Computational investigations were conducted to forecast the binding mode between the synthesized compound and sarco-endoplasmic reticulum (SR) Ca2+ transport ATPase (SERCA), a known target for the development of novel therapeutics for rheumatoid arthritis. Additionally, the drug-likeness of the synthesized compound was assessed by predicting its pharmacokinetic properties.
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Open AccessShort Note
1,4-Diiodotetrafluorobenzene 3,5-di-(pyridin-4-yl)-1,2,4-thiadiazole <1/1>
by
Enrico Podda, Anna Pintus, Vito Lippolis, Francesco Isaia, Alexandra M. Z. Slawin, Cameron L. Carpenter-Warren, John Derek Woollins and Maria Carla Aragoni
Molbank 2024, 2024(2), M1801; https://doi.org/10.3390/M1801 - 01 Apr 2024
Abstract
The reactivity of 3,5-di-(pyridin-4-yl)-1,2,4-thiadiazole (L1) with 1,4-diiodotetrafluorobenzene (1,4-DITFB) was explored and the halogen-bonded 1:1 co-crystal (1) was successfully isolated and structurally characterized.
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(This article belongs to the Section Structure Determination)
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(1RS,3SR)-1-(4-Methylbenzyl)-7-phenyl-5-oxa-6-azaspiro[2.4]hept-6-en-4-one
by
Gleb D. Titov and Nikolai V. Rostovskii
Molbank 2024, 2024(2), M1799; https://doi.org/10.3390/M1799 - 01 Apr 2024
Abstract
The previously unknown cyclopropane spiro-fused with isoxazol-5-one ((1RS,3SR)-1-(4-methylbenzyl)-7-phenyl-5-oxa-6-azaspiro[2.4]hept-6-en-4-one) was synthesized from benzylideneisoxazol-5-one in 34% yield via double methylene transfer from diazomethane. The structure of the compound was established based on 1H, 13C, and 2D NMR spectroscopy and
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The previously unknown cyclopropane spiro-fused with isoxazol-5-one ((1RS,3SR)-1-(4-methylbenzyl)-7-phenyl-5-oxa-6-azaspiro[2.4]hept-6-en-4-one) was synthesized from benzylideneisoxazol-5-one in 34% yield via double methylene transfer from diazomethane. The structure of the compound was established based on 1H, 13C, and 2D NMR spectroscopy and high-resolution mass spectrometry, and confirmed by X-ray diffraction analysis.
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(This article belongs to the Section Organic Synthesis)
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N-(3-chlorophenethyl)-4-nitrobenzamide
by
Diyana Dimitrova, Stanimir Manolov, Dimitar Bojilov, Iliyan Ivanov and Paraskev Nedialkov
Molbank 2024, 2024(2), M1802; https://doi.org/10.3390/M1802 - 01 Apr 2024
Abstract
Herein, we report the synthesis of N-(3-chlorophenethyl)-4-nitrobenzamide in the reaction between 2-(3-chlorophenyl)ethan-1-amine and 4-nitrobenzoyl chloride. The newly obtained bio-functional hybrid molecule was fully characterized via 1H, 13C NMR, UV, and mass spectral data.
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(This article belongs to the Section Structure Determination)
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(E)-1-(4-Methoxyphenyl)-5-methyl-4-(1-phenyl-4-((2-(2,4,6-trichlorophenyl)hydrazineylidene)methyl)-1H-pyrazol-3-yl)-1H-1,2,3-triazole
by
Bakr F. Abdel-Wahab, Hanan A. Mohamed, Benson M. Kariuki and Gamal A. El-Hiti
Molbank 2024, 2024(2), M1798; https://doi.org/10.3390/M1798 - 28 Mar 2024
Abstract
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The reaction of equimolar quantities of 3-(1-(4-methoxyphenyl)-5-methyl-1H-1,2,3-triazol-4-yl)-1-phenyl-1H-pyrazole-4-carbaldehyde and (2,4,6-trichlorophenyl)hydrazine in ethanol containing concentrated hydrochloric acid (0.2 mL; 37%) as a catalyst under reflux for 2 h yielded 1-(1-(benzofuran-2-yl)ethylidene)-2-(2,4,6-trichlorophenyl)hydrazine. The crude produced was purified by crystallization using dimethylformamide to provide
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The reaction of equimolar quantities of 3-(1-(4-methoxyphenyl)-5-methyl-1H-1,2,3-triazol-4-yl)-1-phenyl-1H-pyrazole-4-carbaldehyde and (2,4,6-trichlorophenyl)hydrazine in ethanol containing concentrated hydrochloric acid (0.2 mL; 37%) as a catalyst under reflux for 2 h yielded 1-(1-(benzofuran-2-yl)ethylidene)-2-(2,4,6-trichlorophenyl)hydrazine. The crude produced was purified by crystallization using dimethylformamide to provide the title heterocycle in a 95% yield. The structure of the newly synthesized heterocycle was confirmed through X-ray diffraction and spectral analyses.
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Supplementary material:
Supplementary File 1 (ZIP, 2500 KiB)
Supplementary File 2 (MOL, 3 KiB)
Supplementary File 3 (INCHI, 934 B)
Supplementary File 4 (MOL, 3 KiB)
Supplementary File 5 (MOL, 3 KiB)
Supplementary File 6 (INCHI, 924 B)
Supplementary File 7 (MOL, 3 KiB)
Supplementary File 8 (MOL, 3 KiB)
Supplementary File 9 (INCHI, 1 KiB)
Supplementary File 10 (MOL, 3 KiB)
Supplementary File 11 (CIF, 2549 KiB)
Supplementary File 12 (CIF, 1317 KiB)
Supplementary File 13 (CIF, 1079 KiB)
Supplementary File 1 (ZIP, 2500 KiB)
Supplementary File 2 (MOL, 3 KiB)
Supplementary File 3 (INCHI, 934 B)
Supplementary File 4 (MOL, 3 KiB)
Supplementary File 5 (MOL, 3 KiB)
Supplementary File 6 (INCHI, 924 B)
Supplementary File 7 (MOL, 3 KiB)
Supplementary File 8 (MOL, 3 KiB)
Supplementary File 9 (INCHI, 1 KiB)
Supplementary File 10 (MOL, 3 KiB)
Supplementary File 11 (CIF, 2549 KiB)
Supplementary File 12 (CIF, 1317 KiB)
Supplementary File 13 (CIF, 1079 KiB)
Open AccessCommunication
Aza-Diphosphido-Bridged Di-Iron Complexes Related to the [FeFe]-Hydrogenases
by
Pankaj Das, Catherine Elleouet, François Y. Pétillon and Philippe Schollhammer
Molbank 2024, 2024(2), M1797; https://doi.org/10.3390/M1797 - 25 Mar 2024
Abstract
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The reaction of the dianionic species [Fe2(CO)6(μ-PPh)2]2− with tBuN(CH2Cl)2 gives the di-iron carbonyl aza-diphosphido-bridged complex [Fe2(CO)6(µ-{P(Ph)CH2}2NtBu)] (1
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The reaction of the dianionic species [Fe2(CO)6(μ-PPh)2]2− with tBuN(CH2Cl)2 gives the di-iron carbonyl aza-diphosphido-bridged complex [Fe2(CO)6(µ-{P(Ph)CH2}2NtBu)] (1). Attempts to prepare 1 by click-chemistry by reacting [Fe2(CO)6(μ-PHPh)2] with CH2O and tBuNH2 afforded a bis-phosphido compound [Fe2(CO)6(µ-P(Ph)CH2NHtBu)2] (2) which exists as two, syn and anti, isolable isomers depending on the relative orientation of the groups carried by the phosphorus atoms. In the presence of HBF4.Et2O, in dichloromethane, 1 leads to the stabilized ammonium species [Fe2(CO)6(µ-{P(Ph)CH2}2NHtBu)](BF4) (3). The derivatives 1–3 were characterized by IR and 1H, 31P-{1H} NMR spectroscopies. Their structures in a solid state were determined by X-ray diffraction analyses, which accord with their spectroscopic characteristics.
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Open AccessCommunication
Three-Step Synthesis of N-(7-chloro-4-morpholinoquinolin-2-yl)benzamide from 4,7-Dichloroquinoline
by
Deiby F. Aparicio Acevedo, Marlyn C. Ortiz Villamizar and Vladimir V. Kouznetsov
Molbank 2024, 2024(1), M1796; https://doi.org/10.3390/M1796 - 21 Mar 2024
Abstract
The quinoline derivative, N-(7-chloro-4-morpholinoquinolin-2-yl)benzamide, was synthesized in a conventional three-step procedure from 4,7-dichloroquinoline using a N-oxidation reaction/C2-amide formation reaction/C4 SNAr reaction sequence. The structure of the compound was fully characterized by FT-IR, 1H-, 13C-NMR, DEPT-135°, and ESI-MS
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The quinoline derivative, N-(7-chloro-4-morpholinoquinolin-2-yl)benzamide, was synthesized in a conventional three-step procedure from 4,7-dichloroquinoline using a N-oxidation reaction/C2-amide formation reaction/C4 SNAr reaction sequence. The structure of the compound was fully characterized by FT-IR, 1H-, 13C-NMR, DEPT-135°, and ESI-MS techniques. Its physicochemical parameters (Lipinski’s descriptors) were also calculated using the online SwissADME database. Such derivatives are relevant therapeutic agents exhibiting potent anticancer, antibacterial, antifungal, and antiparasitic properties.
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(This article belongs to the Section Organic Synthesis)
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Open AccessCommunication
Structural Characterization of 4-(4-Nitrophenyl)thiomorpholine, a Precursor in Medicinal Chemistry
by
Paul R. Palme, Richard Goddard, Peter Imming and Rüdiger W. Seidel
Molbank 2024, 2024(1), M1795; https://doi.org/10.3390/M1795 - 20 Mar 2024
Abstract
4-(4-nitrophenyl)thiomorpholine, the title compound, has been used as a precursor for the corresponding 4-thiomorpholinoaniline, which is a useful building block in medicinal chemistry. The crystal and molecular structures of the title compound, however, have not been described thus far. We synthesized the title
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4-(4-nitrophenyl)thiomorpholine, the title compound, has been used as a precursor for the corresponding 4-thiomorpholinoaniline, which is a useful building block in medicinal chemistry. The crystal and molecular structures of the title compound, however, have not been described thus far. We synthesized the title compound by means of a nucleophilic aromatic substitution reaction of 4-fluoronitrobenzene and thiomorpholine and structurally characterized it by X-ray crystallography, DFT calculations, and Hirshfeld surface analysis. In the crystal, the molecule exhibits an approximately CS-symmetric structure, with the nitrogen-bound 4-nitrophenyl group in a quasi axial position on the six-membered thiomorpholine ring in a low-energy chair conformation. The solid-state structure of the title compound is markedly different from that of its morpholine analogue. This can be ascribed to the formation of centrosymmetric dimers through intermolecular C–H···O weak hydrogen bonds involving the methylene groups adjacent to the sulfur atom and face-to-face aromatic stacking.
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(This article belongs to the Section Structure Determination)
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Open AccessCommunication
Butyl (2,2-Dibutoxybutanoyl)-ʟ-Tryptophanate
by
Diego Quiroga and Ericsson Coy-Barrera
Molbank 2024, 2024(1), M1794; https://doi.org/10.3390/M1794 - 19 Mar 2024
Abstract
The multicomponent reaction between ʟ-tryptophan 1, 2-oxobutanoic acid 2, and 1-butanol in the presence of SiMe3Cl was studied using microwave irradiation conditions. The main product was identified as an unreported acetal-containing compound, namely, butyl (2,2-dibutoxybutanoyl)-ʟ-tryptophanate (3), yielding
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The multicomponent reaction between ʟ-tryptophan 1, 2-oxobutanoic acid 2, and 1-butanol in the presence of SiMe3Cl was studied using microwave irradiation conditions. The main product was identified as an unreported acetal-containing compound, namely, butyl (2,2-dibutoxybutanoyl)-ʟ-tryptophanate (3), yielding 89%. NMR experiments demonstrated that the adjacent methylene protons of the acetal group appeared as two signals exhibiting their behavior as diastereotopic protons. DFT/B3LYP calculations revealed an asymmetric molecular structure with specific angles, leading to an explanation of the NMR results. The calculated chemical shifts showed slight differences with the experimental values and suggested magnetic anisotropy and inductive deprotection around the methylene hydrogen atoms in the acetal location. The reaction mechanism was proposed in which SiMe3Cl plays a crucial role by promoting water removal through key steps.
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(This article belongs to the Section Organic Synthesis)
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Open AccessCommunication
Synthesis and In Vitro Antibacterial Evaluation of Mannich Base Nitrothiazole Derivatives
by
Phelelisiwe S. Dube, Dylan Hart, Lesetja J. Legoabe, Audrey Jordaan, Digby F. Warner and Richard M. Beteck
Molbank 2024, 2024(1), M1793; https://doi.org/10.3390/M1793 - 18 Mar 2024
Abstract
Nitrothiazole derivatives have been reported to exhibit activity against aerobic, anaerobic, and microaerophilic bacteria. This activity profile makes the nitrothiazole compound class an ideal lead source against Mycobacterium tuberculosis, which flourishes in varied environments with different oxygen concentrations. In this work, we
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Nitrothiazole derivatives have been reported to exhibit activity against aerobic, anaerobic, and microaerophilic bacteria. This activity profile makes the nitrothiazole compound class an ideal lead source against Mycobacterium tuberculosis, which flourishes in varied environments with different oxygen concentrations. In this work, we investigated six nitrothiazole derivatives for antitubercular activity. The compounds exhibited potent activity, with compounds 9 and 10 possessing an equipotent MIC90 value of 0.24 µM. The compounds were investigated for cytotoxicity against HEK293 cells and hemolysis against red blood cells, and they demonstrated no cytotoxicity nor hemolytic effects, suggesting they possess inherent antitubercular activity.
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(This article belongs to the Topic Towards the Sustainable Synthesis of Biologically Active Molecules in Green Solvents)
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5-(9-(p-Tolyl)-2,3,4,4a,9,9a-hexahydro-1H-1,4-methanocarbazol-6-yl)thiophene-2-carbaldehyde
by
Nikita S. Gudim, Ekaterina A. Knyazeva and Oleg A. Rakitin
Molbank 2024, 2024(1), M1792; https://doi.org/10.3390/M1792 - 14 Mar 2024
Abstract
Donor–π spacer–acceptor (D–π–A) dyes are among the most attractive structures for the design of organic dye-sensitized solar cells (DSSCs). Typically, the key intermediates for these sensitizers are D–π compounds containing an aldehyde group to which an anchor acceptor group is attached via the
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Donor–π spacer–acceptor (D–π–A) dyes are among the most attractive structures for the design of organic dye-sensitized solar cells (DSSCs). Typically, the key intermediates for these sensitizers are D–π compounds containing an aldehyde group to which an anchor acceptor group is attached via the Knoevenagel reaction. In this communication, 5-(9-(p-tolyl)-2,3,4,4a,9,9a-hexahydro-1H-1,4-methanocarbazol-6-yl)thiophene-2-carbaldehyde was prepared via the Suzuki cross-coupling reaction. The structure of the newly synthesized compound was established by means of high-resolution mass spectrometry, 1H NMR, 13C NMR, IR, and UV–Vis spectroscopy. The title compound would be used in the synthesis of sensitizers for DSSCs.
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(This article belongs to the Section Organic Synthesis)
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