A domino synthetic approach for new, angular pyrazol- and isoxazol-heterocycles using [DBU][Ac] as an effective reaction medium
作者:Tushar R. Sutariya、Balvantsingh M. Labana、Bhagyashri D. Parmar、Narsidas J. Parmar、Rajni Kant、Vivek K. Gupta
DOI:10.1039/c5ra00493d
日期:——
Some new, angular pyrazol- and isoxazol-heterocycles have been synthesized by the reaction of pyrazolone/isoxazolone with typical ketone-based substrates—O-alkenyloxy/alkynyloxy-acetophenones.
In silico studies, nitric oxide, and cholinesterases inhibition activities of pyrazole and pyrazoline analogs of diarylpentanoids
作者:Siti Munirah Mohd Faudzi、S. Wei Leong、Faruk A. Auwal、Faridah Abas、Lam K. Wai、Syahida Ahmad、Chau L. Tham、Khozirah Shaari、Nordin H. Lajis、Bohari M. Yamin
DOI:10.1002/ardp.202000161
日期:2021.1
contrast, pyrazole 3a and pyrazoline 5a were found to be the most selective and effective BChE inhibitors over AChE. The data collected from the single‐crystal X‐ray diffraction analysis of compound 5a were then applied in a docking simulation to determine the potential binding interactions that were responsible for the anti‐BChE activity. The results obtained signify the potential of these pyrazole and
One-Pot Synthesis of Benzopyran-4-ones with Cancer Preventive and Therapeutic Potential
作者:Oualid Talhi、Lidia Brodziak-Jarosz、Jana Panning、Barbora Orlikova、Clemens Zwergel、Tzvetomira Tzanova、Stéphanie Philippot、Diana C. G. A. Pinto、Filipe A. Almeida Paz、Clarissa Gerhäuser、Tobias P. Dick、Claus Jacob、Marc Diederich、Denyse Bagrel、Gilbert Kirsch、Artur M. S. Silva
DOI:10.1002/ejoc.201501278
日期:2016.2
A one-potsynthesis of novel benzopyran-4-ones is described. In a tandemreaction, organobase-catalysed Michaeladdition of (RCOCH2COR2)-C-1 on chromone-3-carboxylic acid led to decarboxylation and pyran-4-one ring opening of the latter. This was followed by chromone- and/or chromanone ring closure of the resulting Michael adducts when R-1 is an ortho-hydroxyaryl group. Antioxidant testing of 14 derivatives
Triton-B Adsorbed on Flysh: An Efficient Support for the Base Catalysed Reactions under Microwave Irradiations
作者:VIJENDER GOEL
DOI:10.13005/ojc/280422
日期:2012.12.22
application of Triton-Badsorbed on flyash (a waste material of thermal plants ) has been reported for the variety of basecatalysedreactions such as synthesis of cinnamic acids by Deobner reaction, synthesis of 1-(2-hydroxyphenyl)-5-phenylpent-4-ene-1, 3-diones by Baker- Venkataraman reaction and synthesis of 3-carboxycoumarins by knoevenagel reaction. This material also acts as a support for the reaction
Xanthones are a class of oxygen-containing heterocyclic compounds widely distributed in nature. The natural derivatives can present different substitutions in the xanthone core that include hydroxyl, methoxyl, prenyl and glycosyl groups. The inclusion of aryl groups has only been reported for a few synthetic derivatives, the 2,3-diaryl moiety being recently introduced by our group. Xanthones are endowed with a broad spectrum of biological activities, many of them related to their antioxidant ability, including the scavenging of reactive oxygen species (ROS) and reactive nitrogen species (RNS), as well as metal chelating effects. Considering the interesting and promising antioxidant activities present in compounds derived from the xanthone core, the main goal of this work was to evaluate the scavenging activity of the new 2,3-diarylxanthones for ROS, including superoxide radical (O-2(center dot-)), hydrogen peroxide (H2O2), singlet oxygen (O-1(2)), peroxyl radical (ROO center dot) and hypochlorous acid (HOCl), and RNS, including nitric oxide ((NO)-N-center dot) and peroxynitrite anion (ONOO center dot). The obtained results revealed that the tested 2,3-diarylxanthones are endowed with outstanding ROS and RNS scavenging properties, considering the nanomolar to micromolar range of the IC50 values found. The xanthones with two catechol rings were the most potent scavengers of all tested ROS and RNS. In conclusion, the new 2,3-diarylxanthones are promising molecules to be used for their potential antioxidant properties. (C) 2010 Elsevier Ltd. All rights reserved.