CuO nanoparticles: synthesis and application as an efficient reusable catalyst for the preparation of xanthene substituted 1,2,3-triazoles via click chemistry
摘要:
Copper(II) oxide (CuO) nanoparticles have been found to be an efficient catalyst for 1,3-dipolar cycloaddition (CuAAC) of aromatic azides and acetylenic xanthenes furnishing the corresponding xanthene substituted triazoles in excellent yields. CuO nanoparticles have been synthesized from copper acetate by simple co-precipitation method and characterized by scanning electron microscope, energy dispersive X-ray analysis, transmission electron microscope, and X-ray diffraction analysis. The salient features of the present protocol are mild reaction conditions, shorter reaction time, reusability of the catalyst, and applicability to a wide range of substrates. (C) 2015 Elsevier Ltd. All rights reserved.
[EN] XANTHENEDIONE DERIVATIVES FOR THE TREATMENT OF PIGMENTATION AND SKIN AGEING DISORDERS<br/>[FR] DÉRIVÉS DE XANTHÈNEDIONE POUR LE TRAITEMENT DE TROUBLES DE PIGMENTATION ET DE VIEILLISSEMENT DE LA PEAU
申请人:FABRE PIERRE DERMO COSMETIQUE
公开号:WO2012004390A1
公开(公告)日:2012-01-12
The invention relates to compound of generic formula (I) in which: R1 and R2 represent: OH, a hydrogen atom, a C1-C6 alkyl radical a C1-C6 alkoxy radical, a halogen, or OCOR3; R3 represents: a C1-C24 alkyl radical a C12-C24 alkenyl radical comprising at least one unsaturation; R4 represents: COR5, a glucide substituted or not by one or more acetyl radical(s); R5 represents: a C10-C24 alkyl radical or a C12-C24 alkenyl radical comprising at least one unsaturation; R6 and R7 represent: - simultaneously a hydrogen atom or a methyl radical, or - when R6 represents a hydrogen atom, R7 represents a C1-C6 alkyl radical or a phenyl substituted or not by one or more C1-C3 alkoxy radical(s) or one or more halogen(s) or - R6 and R7 are bonded together and form a C3-C6 cycloalkyl, and pharmaceutically or cosmetically acceptable salts.
Synthesis and antioxidant studies of novel bi-, tri-, and tetrapodal 9-aryl-1,8-dioxo-octahydroxanthenes
作者:P. Iniyavan、S. Sarveswari、V. Vijayakumar
DOI:10.1016/j.tetlet.2015.01.162
日期:2015.3
Compounds bearing two, three, and four 9-aryl-1,8-dioxo-octahydroxanthenes units were synthesized by regioselective O-alkylation of monopodal xanthenes with bis-, tris-, and tetralds(bromomethyl)benzenes as alkylating agents using K2CO3 as base and DMF as solvent in moderate temperature. All the synthesized compounds were characterized by NMR and mass spectral data and then tested for antioxidant activity, as reflected by free radical scavenging, increased with increasing number of xanthene units. (C) 2015 Elsevier Ltd. All rights reserved.
XANTHENEDIONE DERIVATIVES FOR THE TREATMENT OF PIGMENTATION AND SKIN AGEING DISORDERS
申请人:Pierre Fabre Dermo-Cosmétique
公开号:EP2590959A1
公开(公告)日:2013-05-15
US8906416B2
申请人:——
公开号:US8906416B2
公开(公告)日:2014-12-09
CuO nanoparticles: synthesis and application as an efficient reusable catalyst for the preparation of xanthene substituted 1,2,3-triazoles via click chemistry
Copper(II) oxide (CuO) nanoparticles have been found to be an efficient catalyst for 1,3-dipolar cycloaddition (CuAAC) of aromatic azides and acetylenic xanthenes furnishing the corresponding xanthene substituted triazoles in excellent yields. CuO nanoparticles have been synthesized from copper acetate by simple co-precipitation method and characterized by scanning electron microscope, energy dispersive X-ray analysis, transmission electron microscope, and X-ray diffraction analysis. The salient features of the present protocol are mild reaction conditions, shorter reaction time, reusability of the catalyst, and applicability to a wide range of substrates. (C) 2015 Elsevier Ltd. All rights reserved.