A click chemistry approach for the synthesis of mono and bis aryloxy linked coumarinyl triazoles as anti-tubercular agents
摘要:
A series of mono and bis-triazole coumarin hybrids 6a-u and 9a-f respectively have been synthesized using 4-(azidomethyl)-2H-chromen-2-ones 5a-i and aryl propargyl ethers 2a-c/8 employing Click chemistry modified protocol for Azide-Alkyne cycloadditions(CuAAC). Anti-tubercular screening showed moderate activity for mono aryloxy compounds 6a-u with MIC 50-100 mu g/mL, whereas the bis compounds 9a-f were more effective with MICs between 0.2 and 12.5 mu g/mL. Molecular modeling and 3D-QSAR measurements using CoMFA and Topomer CoMFA further supported the observed results. The his compound 9b showed excellent activity with MIC value as low as 0.2 mu g/mL. (C) 2015 Elsevier Masson SAS. All rights reserved.
Unusual anisotropic effects from 1,3-dipolar cycloadducts of 4-azidomethyl coumarins
作者:Raviraj A. Kusanur、Manohar V. Kulkarni、Geetha M. Kulkarni、Susanta K. Nayak、Tayur N. Guru Row、Kilivelu Ganesan、Chung-Ming Sun
DOI:10.1002/jhet.273
日期:——
acetone to give 4-azidomethylcoumarins (), which underwent 1,3-dipolar cycloaddition with acetylenic dipolarophiles to give triazoles (). These triazoles () have been found to exhibit interesting variations in the chemical shifts of C3H and C4-methylene protons. Protonation studies indicate that the shielding effect of the C3H of coumarin is due to π-electrons of the triazole ring, further supported
Click Chemistry Approach for Bis-Chromenyl Triazole Hybrids and Their Antitubercular Activity
作者:Reshma J. Naik、Manohar V. Kulkarni、K. Sreedhara Ranganath Pai、Pawan G. Nayak
DOI:10.1111/j.1747-0285.2012.01441.x
日期:2012.10
1,4‐Disubstituted bis‐chromenyl triazole hybrids 5a–m have been synthesized in a three‐step reaction sequence from 4‐(bromomethyl)‐2H‐chromen‐2‐ones 3a–m. The intermediate azides 4a–m underwent a regioselective 1,3‐dipolar cycloaddition with a 2H‐chromen‐2‐one linked acetylenic dipolarophile in the presence of Cu (II)/ascorbate/water/n‐butanol reaction medium. Three compounds 5h–j exhibited 6.25 μg/mL MIC against M. tuberculosis. Among the compounds screened for antifungal activity, lowest MIC of 6.25 μg/mL was observed for 5c against A. niger that also exhibited DNA cleavage observed by agarose gel electrophoresis. All the compounds were moderately active against both Gram‐positive and Gram‐negative bacterial strains. The cytotoxic effect of potent compounds on normal cells (V79 and HBL100) was assessed by MTT assay.
Click chemistry approach for the regioselective synthesis of iso-indoline-1,3-dione-linked 1,4 and 1,5 coumarinyl 1,2,3-triazoles and their photophysical properties
作者:Ashish Anand、Manohar V. Kulkarni
DOI:10.1080/00397911.2017.1283524
日期:2017.4.3
ABSTRACT Copper-catalyzed reaction of N-propargyl isoindoline-1,3-dione and 4-azidomethyl coumarins / 4-azidomethyl-1-aza coumarins under click chemistry conditions afforded 1,4-disubstituted 1,2,3-triazoles, whereas ruthenium catalysis yielded isomeric 1,5-disubstituted 1,2,3-triazoles. The two regioisomers have been distinguished by NOE studies. UV absorption for a given pair of isomers exhibited
摘要 在点击化学条件下,N-炔丙基异吲哚啉-1,3-二酮和 4-叠氮甲基香豆素/4-叠氮甲基-1-氮杂香豆素在铜催化下反应得到 1,4-二取代 1,2,3-三唑,而钌催化产生异构的 1,5-二取代的 1,2,3-三唑。两种区域异构体已通过 NOE 研究区分开来。一对给定异构体的紫外吸收显示出相似的趋势,而荧光测量显示出相当大的差异。还对叠氮化物与铜和钌的相互作用进行了光物理研究。图形概要