Cu ion-exchanged and Cu nanoparticles decorated mesoporous ZSM-5 catalysts for the activation and utilization of phenylacetylene in a sustainable chemical synthesis

RSC Advances ◽  
2016 ◽  
Vol 6 (90) ◽  
pp. 87066-87081 ◽  
Author(s):  
Bhaskar Sarmah ◽  
Biswarup Satpati ◽  
Rajendra Srivastava

Highly dispersed Cu nanoparticles supported on the large external surface of Meso-ZSM-5 exhibited excellent activity in the selective synthesis of indolizines, chalcones, and triazoles using phenylacetylene as one of the building blocks.

2020 ◽  
Vol 24 (21) ◽  
pp. 2475-2497
Author(s):  
Andrea Verónica Rodríguez-Mayor ◽  
German Jesid Peralta-Camacho ◽  
Karen Johanna Cárdenas-Martínez ◽  
Javier Eduardo García-Castañeda

Glycoproteins and glycopeptides are an interesting focus of research, because of their potential use as therapeutic agents, since they are related to carbohydrate-carbohydrate, carbohydrate-protein, and carbohydrate-lipid interactions, which are commonly involved in biological processes. It has been established that natural glycoconjugates could be an important source of templates for the design and development of molecules with therapeutic applications. However, isolating large quantities of glycoconjugates from biological sources with the required purity is extremely complex, because these molecules are found in heterogeneous environments and in very low concentrations. As an alternative to solving this problem, the chemical synthesis of glycoconjugates has been developed. In this context, several methods for the synthesis of glycopeptides in solution and/or solid-phase have been reported. In most of these methods, glycosylated amino acid derivatives are used as building blocks for both solution and solid-phase synthesis. The synthetic viability of glycoconjugates is a critical parameter for allowing their use as drugs to mitigate the impact of microbial resistance and/or cancer. However, the chemical synthesis of glycoconjugates is a challenge, because these molecules possess multiple reaction sites and have a very specific stereochemistry. Therefore, it is necessary to design and implement synthetic routes, which may involve various protection schemes but can be stereoselective, environmentally friendly, and high-yielding. This review focuses on glycopeptide synthesis by recapitulating the progress made over the last 15 years.


2020 ◽  
Author(s):  
Hitesh Patel ◽  
Wolf Ihlenfeldt ◽  
Philip Judson ◽  
Yurii S. Moroz ◽  
Yuri Pevzner ◽  
...  

We have made available a database of over 1 billion compounds predicted to be easily synthesizable. They have been created by a set of transforms based on an adaptation and extension of the CHMTRN/PATRAN programming languages describing chemical synthesis expert knowledge, which originally stem from the LHASA project. The chemoinformatics toolkit CACTVS was used to apply a total of 53 transforms to about 150,000 readily available building blocks (enamine.net). Only single-step, two-reactant syntheses were calculated for this database even though the technology can execute multi-step reactions. The possibility to incorporate scoring systems in CHMTRN allowed us to subdivide the database of 1.75 billion compounds in sets according to their predicted synthesizability, with the most-synthesizable class comprising 1.09 billion synthetic products. Properties calculated for all SAVI products show that the database should be well-suited for drug discovery. It is being made publicly available for free download from https://cactus.nci.nih.gov/download/savi_download/.


2020 ◽  
Author(s):  
Skander Abboud ◽  
El hadji Cisse ◽  
Michel Doudeau ◽  
Hélène Bénédetti ◽  
Vincent AUCAGNE

One of the main limitations encountered during the chemical synthesis of proteins through native chemical ligation (NCL) is the limited solubility of some of the peptide segments. The most commonly used solution to overcome this problem is to derivatize the segment with a temporary solubilizing tag. Conveniently, the tag can be introduced on the thioester segment in such a way that it is removed concomitantly with the NCL reaction. We herein describe a generalization of this approach to N-terminal cysteinyl segment counterparts, using a straightforward synthetic approach that can be easily automated from commercially available building blocks, and applied it to a well-known problematic target, SUMO-2 (93 amino acids).


ChemInform ◽  
2007 ◽  
Vol 38 (2) ◽  
Author(s):  
Bin Wu ◽  
Zhongping Tan ◽  
Gong Chen ◽  
Jiehao Chen ◽  
Zihao Hua ◽  
...  

2019 ◽  
Vol 15 ◽  
pp. 2563-2568
Author(s):  
Debasish Pal ◽  
Balaram Mukhopadhyay

The total chemical synthesis of the pentasaccharide repeating unit of the O-polysaccharide from E. coli O132 is accomplished in the form of its 2-aminoethyl glycoside. The 2-aminoethyl glycoside is particularly important as it allows further glycoconjugate formation utilizing the terminal amine without affecting the stereochemistry of the reducing end. The target was achieved through a [3 + 2] strategy where the required monosaccharide building blocks are prepared from commercially available sugars through rational protecting group manipulation. The NIS-mediated activation of thioglycosides was used extensively for the glycosylation reactions throughout.


RSC Advances ◽  
2016 ◽  
Vol 6 (75) ◽  
pp. 70763-70769 ◽  
Author(s):  
Pengxi Li ◽  
Ruguang Ma ◽  
Yao Zhou ◽  
Yongfang Chen ◽  
Qian Liu ◽  
...  

Highly dispersed CoO nanoparticles on mesoporous carbon show the excellent activity and stability toward the electrocatalytic oxygen reduction reaction with a four-electron reaction path, compared to commercial Pt/C.


1989 ◽  
Vol 67 (5) ◽  
pp. 831-839 ◽  
Author(s):  
Masad José Damha ◽  
Nassim Usman ◽  
Kelvin Kenneth Ogilvie

A fast and convenient procedure for the chemical synthesis of arabinonucleotides, which eliminates the multistep protection of the arabinonucleoside building blocks, is described. The results of these studies were successfully applied to the automated chemical synthesis of the hexanucleotide 5′-aUpaApaUpaApaUpaA-3′. Both solution and solid phase phosphite triester procedures are described. Keywords: arabinonucleotides, arabinophosphoramidites, automated chemical synthesis, protected arabinonucleosides.


RSC Advances ◽  
2016 ◽  
Vol 6 (27) ◽  
pp. 22812-22820 ◽  
Author(s):  
Astha Shukla ◽  
Rajib Kumar Singha ◽  
L. N. Sivakumar Konathala ◽  
Takehiko Sasaki ◽  
Rajaram Bal

Highly dispersed Cu-nanoparticles supported on nanocrystalline CeO2 were prepared which showed good catalytic activity toward selective oxidation of aromatic amines.


Molecules ◽  
2018 ◽  
Vol 23 (8) ◽  
pp. 1997 ◽  
Author(s):  
Archanamayee Behera ◽  
Suvarn Kulkarni

Bacteria often contain rare deoxy amino sugars which are absent in the host cells. This structural difference can be harnessed for the development of vaccines. Over the last fifteen years, remarkable progress has been made toward the development of novel and efficient protocols for obtaining the rare sugar building blocks and their stereoselective assembly to construct conjugation ready bacterial glycans. In this review, we discuss the total synthesis of a variety of rare sugar containing bacterial glycoconjugates which are potential vaccine candidates.


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