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598 Aktuelle Fachpublikationen in Letters in Organic Chemistry

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Synthesis of Internal gem-Diborylalkanes by Copper-Catalyzed Double Hydroboration of Conjugated Internal Alkynes

28.06.2017 | Netsu, Yuma; Tsukada, Naofumi, Letters in Organic Chemistry, 2017

Abstract: Background: Geminal diboryl reagents have attracted considerable attention due to their unique reactivities. Double hydroboration of alkynes is a convenient and useful method for the synthesis of diborylalkanes. However, the double hydroboration is applied mainly to terminal alkynes. ...

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N-Acetylation of Aromatic Amines by the Soil Fungus Aspergillus japonicus (UFMS 48.136)

28.06.2017 | P. de Lima, Denis; C. Giannesi, Giovana; dos Anjos dos Santos, Edson; S. Ebbing Freitas, Thais; S. Lopes, Rosangela; ..., Letters in Organic Chemistry, 2017

Abstract: Background: Fungi can play an important role in environmental remediation. A key class of pollutants is the aromatic amines (AA) comprising dyes, drugs, pesticides and products originated from combustion and other industrial residues. The microbial N-acetylation is known to be a ...

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Silica Nanoparticles/Nanosilica Sulfuric Acid as a Reusable Catalyst for Fast, Highly Efficient and Green Synthesis of 2-(Heteroaryl)acetamide Derivatives

18.05.2017 | Rezaei, Aram; Ramazani, Ali; Gouranlou, Farideh; Woo Joo, Sang, Letters in Organic Chemistry, 2017

Abstract: Background: Nanoparticles (NPs) for large surface area and unique physicochemical properties have a potential to perform excellent catalytic activity in comparison to bulk materials. As part of our growing program to design fundamental and potent methods for the synthesis of ...

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Molecular Dynamics Simulation and DFT Study to Predict the Refractive Index of Intermediates in the Paal-Knorr Pyrrole Synthesis

18.05.2017 | Sargolzaei, Mohsen; Soleimani, Esmaiel; Afshar, Mahdi, Letters in Organic Chemistry, 2017

Abstract: Background: Refractive index is an important optical property which can be used to identify substances such as intermediates in organic reactions. Objective: To predict this property we used molecular dynamics simulations and density functional theory. We have calculated ...

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Simple and Efficient Synthesis of Novel bis-Betti Bases via a One-Pot Pseudo-Five-Component Reaction

18.05.2017 | Olyaei, Abolfazl; Sadat Abforushha, Elham; Khoeiniha, Reyhaneh, Letters in Organic Chemistry, 2017

Abstract: Background: A one-pot pseudo-five-component green synthesis of new bis-Betti bases is described. The reported bis-Betti bases are obtained via the condensation of one equivalent of 2,3- dihydroxynaphthalene, two equivalents of aryl aldehydes, and two equivalents of heteroaryl amines in ...

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The Highly Efficient Beckmann Rearrangement of Ketoximes to Amides By Using Mukaiyama Reagent Under Mild Conditions

18.05.2017 | Azadi, Roya; Shams, Leila, Letters in Organic Chemistry, 2017

Abstract: Background: A rapid and efficient synthesis of amides via Beckmann rearrangement of ketoximes with good to excellent yields has been carried out using Mukaiyama reagent/Et3N system. The procedure is mild and suitable for both aromatic and cycloaliphatic substrates affording the ...

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β-Cyclodextrin (β-CD) as a Supramolecular Catalyst for the Synthesis of Isoxazoles and Thiopyrimidines and their Antimicrobial Screening

18.05.2017 | V. Chate, Asha; H. Gill, Charansingh, Letters in Organic Chemistry, 2017

Abstract: Background: Isoxazole and pyrimidines are interesting heterocyclic molecules, which are present as structural motif in numerous natural products synthetic drugs. Isoxazole and thiopyrimidines exhibit antidiabetic, cytotoxic tuberculostatic, and anticonvulsant activities. Herein we ...

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Mesoporous Silica Supported Ru Nanoparticles for Hydrogenation of CO2 Molecule

18.05.2017 | Srivastava, Vivek, Letters in Organic Chemistry, 2017

Abstract: Background: The unique physiochemical properties of nanoparticles as compared to their bulk state make them highly useful in the area of catalysis, fuel cell development, photonics, medicines, solar cell and biomedical imaging. The small size structures of nanoparticles are ...

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L-Cysteine (3-Nitrophenyl)methyl Ester Hydrochloride: A New Chiral Reagent in the Sugar Analysis

18.05.2017 | De Marino, Simona; Festa, Carmen; Iorizzi, Maria; Zollo, Franco, Letters in Organic Chemistry, 2017

Abstract: Background: Several GC and HPLC methods have been proposed for the separation of aldose enantiomers. Method: We developed a general HPLC method for the discrimination of (D,L)-monosaccharide components from natural products. The reaction involves the preparation of L-cysteine ...

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Synthesis and Biological Evaluation of New 4-Thiazolidinone Derivatives as Carbonic Anhydrase Inhibitors

18.05.2017 | Genc, Hayriye; Ceken, Busra; Bilen, Cigdem; Sackes, Zubeyde; Gencer, Nahit; Arslan, Oktay, Letters in Organic Chemistry, 2017

Abstract: Background: The catalytically active site of CA enzyme is Zn (II) bound hydroxide ion part which acts as a strong nucleophile (at neutral pH) on the CO2 molecule bound in a hydrophobic pocket nearby. We designed a series of thiazolidinone molecules which are able to approach the ...

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