Triazole-curcuminoids: A new class of derivatives for ‘tuning’ curcumin bioactivities?
摘要:
Curcumin is a unique blend of pharmacophores responsible for the pleiotropy of this natural pigment. In the present study we have replaced the 1,3-dicarbonyl moiety with a 1,2,3-triazole ring to furnish a new class of triazole-curcuminoids as a possible strategy to generate new compounds with different potency and selectivity compared to curcumin. We obtained a proof-of-principle library of 28 compounds tested for their cytotoxicity (SY-SY5Y and HeLa cells) and for their ability to inhibit NF-kappa B. Furthermore, we also generated 1,3-dicarbonyl curcuminoids of selected click compounds. Triazole-curcuminoids lost their ability to be Michael's acceptors, yet maintained some of the features of the parent compounds and disclosed new ones. In particular, we found that some compounds were able to inhibit NF-kappa B without showing cytotoxicity, while others, unlike curcumin, activated NF-kappa B signalling. This validates the hypothesis that click libraries can be used to investigate the biological activities of curcumin as well as generate analogs with selected features. (C) 2015 Elsevier Ltd. All rights reserved.
Photoswitchable Regiodivergent Azidation of Olefins with Sulfonium Iodate(I) Reagent
作者:Dodla S. Rao、Thurpu R. Reddy、Aakanksha Gurawa、Manoj Kumar、Sudhir Kashyap
DOI:10.1021/acs.orglett.9b03910
日期:2019.12.20
Photoswitchable strategy for selective azidation of structurally diverse olefins under transition-metal-free conditions is reported. The unprecedented reactivity of trimethylsulfonium [bis(azido)iodate(I)] species under visible light allows radical azidooxygenation of the C═C π bond with distinctive selectivity. In the absence of visible light, the reaction proceeds through an ionic intermediate which
Iodoazidation of Alkenes by Using Iodine Pentafluoride–Pyridine–Hydrogen Fluoride and Trimethylsilyl Azide
作者:Shoji Hara、Tatsuki Hiraoka、Shohei Yano
DOI:10.1055/s-0035-1561374
日期:——
Iodoazidation of alkenes was carried out by using iodine pentafluoride–pyridine–hydrogen fluoride and trimethylsilyl azide. In the reactions of terminal alkenes, anti-Markovnikov products were formed selectively. Cyclohexene gave a mixture of cis- and trans-adducts. These results suggest the involvement of radical species in the reaction. Iodoazidation of alkenes was carried out by using iodine pentaf
The combination of sodium periodate, potassium iodide, and sodium azide has been found to be an efficient, simple, and inexpensive reagent system for azidoiodination of alkenes. The regiospecific 1,2-azidoiodination proceeds in an anti-Markovnikov fashion to produce β-iodoazides in excellent yields. azides - alkenes - azidoiodination - β-iodoazides - regiospecific
Ring Enlargement of Three‐Membered Heterocycles by Treatment with In Situ Formed Tricyanomethane
作者:Klaus Banert、Madhu Chityala、Marcus Korb
DOI:10.1002/chem.202000089
日期:2020.5.15
expansion with formation of 2-(dicyanomethylidene)oxazolidine derivatives or creation of the corresponding thiazolidine, imidazolidine, or imidazoline compounds and opens up a new access to these push-pull-substituted olefinic products. The regio- and stereochemistry of the ring-enlargement processes are discussed, and the proposed reaction mechanisms were confirmed by using 15 N-labeled substrates. It
Synthesis of 6,7-dihydro-4<i>H</i>-[1,2,3]triazolo[5,1-<i>c</i>][1,4]oxazines <i>via</i> tandem reactions of <i>β</i>-iodoazides with propargyl alcohols
Abstract Tandem reactions between β-iodoazides and propargylalcohols under mild conditions are presented, providing a general and convenient method for the synthesis of 6,7-dihydro-4H-[1,2,3]triazolo[5,1-c][1,4]oxazines. The advantages of this method are its simple operation, high efficiency and high product yields (80–95%).
摘要 介绍了β-碘叠氮化物和炔丙醇在温和条件下的串联反应,为合成6,7-二氢-4 H- [1,2,3]三唑并[5,1- c ][提供了一种通用方便的方法。1,4]恶嗪。该方法的优点是操作简单、效率高、产品收率高(80-95%)。