ChemInform Abstract: A Synthetic Pathway to Substituted Benzofuroxans Through the Intermediacy of Sulfonates: The Case Example of Fluoro-Nitrobenzofuroxans.

ChemInform ◽  
2016 ◽  
Vol 47 (52) ◽  
Author(s):  
Cyril Jovene ◽  
Jerome Marrot ◽  
Jean-Philippe Jasmin ◽  
Elena Chugunova ◽  
Regis Goumont
Keyword(s):  
2020 ◽  
Author(s):  
SANJIB KAR ◽  
Sruti Mondal ◽  
Kasturi Sahu ◽  
Dilruba Hasina ◽  
Tapobrata Som ◽  
...  

<p>The synthesis of new graphene-type materials (<i>via</i> polymerization of porphyrin macrocycles) through a simple chemical synthetic pathway (at RT) has been demonstrated. This newly synthesized material can be dispersed in water with an average sheet size of few microns and with single layer thickness. As the porphyrin contains four inner ring nitrogen atoms thus the presented polymeric material will be close analogous of N-doped graphene. Porphyrin as the key component to synthesize layered graphene type continuous 2D structure has never been attempted before. </p> <p> </p>


Author(s):  
Jack Rowbotham ◽  
Oliver Lenz ◽  
Holly Reeve ◽  
Kylie Vincent

<p></p><p>Chemicals labelled with the heavy hydrogen isotope deuterium (<sup>2</sup>H) have long been used in chemical and biochemical mechanistic studies, spectroscopy, and as analytical tracers. More recently, demonstration of selectively deuterated drug candidates that exhibit advantageous pharmacological traits has spurred innovations in metal-catalysed <sup>2</sup>H insertion at targeted sites, but asymmetric deuteration remains a key challenge. Here we demonstrate an easy-to-implement biocatalytic deuteration strategy, achieving high chemo-, enantio- and isotopic selectivity, requiring only <sup>2</sup>H<sub>2</sub>O (D<sub>2</sub>O) and unlabelled dihydrogen under ambient conditions. The vast library of enzymes established for NADH-dependent C=O, C=C, and C=N bond reductions have yet to appear in the toolbox of commonly employed <sup>2</sup>H-labelling techniques due to requirements for suitable deuterated reducing equivalents. By facilitating transfer of deuterium atoms from <sup>2</sup>H<sub>2</sub>O solvent to NAD<sup>+</sup>, with H<sub>2</sub> gas as a clean reductant, we open up biocatalysis for asymmetric reductive deuteration as part of a synthetic pathway or in late stage functionalisation. We demonstrate enantioselective deuteration via ketone and alkene reductions and reductive amination, as well as exquisite chemo-control for deuteration of compounds with multiple unsaturated sites.</p><p></p>


2020 ◽  
Vol 17 (2) ◽  
pp. 85-89
Author(s):  
Francisco J. Hidalgo ◽  
Nathan A.P. Lorentz ◽  
TinTin B. Luu ◽  
Jonathan D. Tran ◽  
Praveen D. Wickremasinghe ◽  
...  

: Maltodextrins have an increasing number of biomedical and industrial applications due to their attractive physicochemical properties such as biodegradability and biocompatibility. Herein, we describe the development of a synthetic pathway and characterization of thiol-responsive maltodextrin conjugates with dithiomaleimide linkages. 19F NMR studies were also conducted to demonstrate the exchange dynamics of the dithiomaleimide-functionalized sugar end groups.


Catalysts ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 140
Author(s):  
Ferdinando Zaccone ◽  
Valentina Venturi ◽  
Pier Paolo Giovannini ◽  
Claudio Trapella ◽  
Marco Narducci ◽  
...  

Recent studies have highlighted the therapeutic and ergogenic potential of the ketone body ester, (R)-3-hydroxybutyl-(R)-3-hydroxybutyrate. In the present work, the enzymatic synthesis of this biological active compound is reported. The (R)-3-hydroxybutyl-(R)-3-hydroxybutyrate has been produced through the transesterification of racemic ethyl 3-hydroxybutyrate with (R)-1,3-butanediol by exploiting the selectivity of Candida antarctica lipase B (CAL-B). The needed (R)-1,3-butanediol was in turn obtained from the kinetic resolution of the racemate achieved by acetylation with vinyl acetate, also in this case, thanks to the enantioselectivity of the CAL-B used as catalyst. Finally, the stereochemical inversion of the unreacted (S) enantiomers of the ethyl 3-hydroxybutyate and 1,3-butanediol accomplished by known procedure allowed to increase the overall yield of the synthetic pathway by incorporating up to 70% of the starting racemic reagents into the final product.


2021 ◽  
pp. 152983
Author(s):  
M. Girard ◽  
A. Hagen ◽  
I. Schwerdt ◽  
M. Gaumer ◽  
L. McDonald ◽  
...  

2021 ◽  
Vol 9 (13) ◽  
pp. 4597-4606
Author(s):  
Desiree Adamczak ◽  
Andrea Perinot ◽  
Hartmut Komber ◽  
Anna Illy ◽  
Sandra Hultmark ◽  
...  

Poly(indacenodithiophene-alt-benzothiadiazole) with different side chains and molecular weight is made using two different pathways in which all C–C coupling steps are achieved by C–H activation, and the products are comprehensively investigated.


Nano Letters ◽  
2021 ◽  
Author(s):  
Spencer D. Golze ◽  
Stefania Porcu ◽  
Chen Zhu ◽  
Eli Sutter ◽  
Pier Carlo Ricci ◽  
...  

2014 ◽  
Vol 10 ◽  
pp. 1672-1680 ◽  
Author(s):  
Silvia Bernardi ◽  
Paola Fezzardi ◽  
Gabriele Rispoli ◽  
Stefania E Sestito ◽  
Francesco Peri ◽  
...  

Four novel calix[4]arene-based glycoclusters were synthesized by conjugating the saccharide units to the macrocyclic scaffold using the CuAAC reaction and using long and hydrophilic ethylene glycol spacers. Initially, two galactosylcalix[4]arenes were prepared starting from saccharide units and calixarene cores which differ in the relative dispositions of the alkyne and azido groups. Once the most convenient synthetic pathway was selected, two further lactosylcalix[4]arenes were obtained, one in the cone, the other one in the 1,3-alternate structure. Preliminary studies of the interactions of these novel glycocalixarenes with galectin-3 were carried out by using a lectin-functionalized chip and surface plasmon resonance. These studies indicate a higher affinity of lactosyl- over galactosylcalixarenes. Furthermore, we confirmed that in case of this specific lectin binding the presentation of lactose units on a cone calixarene is highly preferred with respect to its isomeric form in the 1,3-alternate structure.


1984 ◽  
Vol 37 (12) ◽  
pp. 2537 ◽  
Author(s):  
P Cacioli ◽  
JA Reiss

A series of halogenated phenoxathiins (10a-c),(11a,b), and a 1-azaphenoxathiin (13) have been prepared satisfactorily by the reaction between l-oxaspiro[2.5]octa-5,7-dien-4-ones (6-spiroepoxy- 2,4-cyclohexadienones) (9a-c) and the appropriate halogenated thiophenolate anion. The method described provides a novel synthetic pathway to highly substituted phenoxathiins. Several (O-hydroxyphenyl)phenyl sulfides (14a-d) were also prepared with the anion of p-chlorothiophenol. Formation of the diphenyl sulfide (14b) with concomitant trapping of formaldehyde as a dimedone derivative (19) enabled a reaction pathway to be proposed.


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