Catalysis of a free radical allylic displacement by allyl iodide

The preparation of allyl chlorostannan 5 was achieved into two steps via free radical displacement of the sulphone group by tributyltin radical. The chemical structure of compound 5 was confirmed by normal spectroscopic methods, including NMR, IR and MS. The mechanism for the free radical reaction of chlorosulphone 6 with tributyltinhydride is likely to proceed via the catalysis of the trace amount of the iodoallyl chloride 4.     

Application of the Cleavable Isocyanide in Efficient Approach to Pyroglutamic Acid Analogues with Potential Biological Activity

Two efficient procedures have been developed for the synthesis of pyroglutamic acid analogues 28, 29, and 34. According to the first method the Ugi (4C3C) reaction is followed by a post-transformation reaction, and the second method involves the Michael addition reaction. The present methodologies demonstrate the applicability of 1-(2,2-dimethoxyethyl)-2-isocyanobenzene (15) as a cleavable isocyanide in the Ugi/ post-transformation reaction and a strong nucleophile in the Michael addition reaction. The framework of pyroglutamic acid analogues has been constructed by the selective cleavage of the C-terminal amide bond and nucleophilic addition to the activated α,β-unsaturated carbonyl group.

     

Medicinal potential of willow: A chemical perspective of aspirin discovery

The willow tree is a symbolic medicinal plant that has been associated with the discovery of aspirin, chemically known as acetylsalicylic acid, or salicylate, which still offers surprises as a revival drug. The philosophical perspective of the significance of the willow tree has been elaborated since the Assyrians (4000 BC) and Sumerians (3500 BC), who were aware of its medicinal merits. In 1838, the main pharmacologically active ingredient of willow, the salicin structure was elucidated by hydrolysis to comprise D-glucose and salicyl alcohol. These uncovered new perspectives, which eventually lead to the discovery of aspirin.     

Highly Diastereoselective Metal-Free Catalytic Synthesis of Drug-Like Spiroimidazolidinone

Russian Journal of Organic Chemistry - A four-step procedure has been developed for the synthesis of (S)-3-isopropyl-1-[(R)-1-phenylethyl)- 1,4-diazaspiro[4.5]decan-2-one with high...     

Characterization of High Voltage Cold Atmospheric Plasma Generation in Sealed Packages as a Function of Container Material and Fill Gas

While numerous experiments have demonstrated the efficacy of high voltage cold atmospheric pressure plasmas (HVCAPs) in sealed packages for microbial inactivation, the influence of the package on the emitted species measured during HVCAP discharge is poorly understood. This study elucidates the impact of the package on plasma generation in sealed packages for four separate gases (ambient air, commercial grade compressed air, a helium/air mixture, and nitrogen) placed in commercially available transparent plastic containers and bags representative of the materials used in the food industry. The container and bag individually reduced emission signal intensity by an average of 63 and 45%, respectively, across the measured wavelengths of 200–1100 nm, demonstrating that they acted as broadband absorbers. Neither the container nor bag caused additional emission lines to appear, indicating no significant effect on the types of species generated. Considering the minimum applied voltage necessary to induce a discharge, the power dissipated by the nitrogen and ambient air plasma generated at 72 ± 3.7 kV RMS were comparable to the compressed dry air discharge generated at 80 ± 3.7 kV RMS. The helium discharge at 37 ± 3.7 kV RMS absorbed approximately 92% more power than these gases. Rotational temperatures ranged from 285 K for helium to 479 K for compressed air. These results indicate that the package impacts the intensity distribution but not the presence of the most dominant peaks, although further studies are required to elucidate the impact on less intense peaks.     

A novel developed method to study the energy/exergy flows of buildings compared to the traditional method

Journal of Thermal Analysis and Calorimetry - The present article focuses on finding a more accurate method to draw the energy and exergy flows that have drawn previously by many researchers. These...     

Synthesis of New Drug-Like Piperazine-2,5-diones by the Ugi/Tandem Process Catalyzed by TMSOTf and Their Molecular Docking

Russian Journal of General Chemistry - A new four-components post-Ugi transformation process has been studied. It provides an efficient access to biologically active piperazine-2,5-dione...