Ruthenium-Catalyzed Azide-Thioalkyne Cycloadditions in Aqueous Media: A Mild, Orthogonal, and Biocompatible Chemical Ligation
作者:Paolo Destito、José R. Couceiro、Hélio Faustino、Fernando López、José L. Mascareñas
DOI:10.1002/anie.201705006
日期:2017.8.28
metal-promoted bioorthogonal ligations remains as a major scientific challenge. Demonstrated herein is that azides undergo efficient and regioselective room-temperature annulations with thioalkynes in aqueous milieu when treated with catalytic amounts of a suitable ruthenium complex. The reaction is compatible with different biomolecules, and can be carried out in complex aqueous mixtures such as phosphate
A new protocol for the photoinduced copper(I)-catalyzedazide–alkynecycloaddition (CuAAC) was developed. The system utilizes mesoporous graphitic carbon nitride (mpg-N3C4) as a heterogeneous photocatalyst to realize the in situ formation of the required copper(I) catalyst by reducing copper(II) species upon UV or sunlight irradiation. The efficiency of the system in regard to its ability to photoinitiate
为光诱导的铜(I)催化的叠氮化物-炔烃环加成反应(CuAAC)开发了一种新的协议。该系统利用介孔石墨碳氮化物(mpg-N 3 C 4)作为非均相光催化剂,通过还原铜(II)实现原位形成所需的铜(I)催化剂。)受到紫外线或阳光照射的物种。关于在不同溶剂中光引发各种脂族和芳族叠氮化物和炔烃的CuAAC的能力,研究了该系统的效率。光热法测量证实,反应速率取决于光强度以及连续或间歇照射。重要的是,由于光催化剂的非均质性质,mpg-C 3 N 4可以很容易地分离出来并在进一步的反应中重新使用,而不会失去活性。
A fluorogenic ‘click’ reaction of azidoanthracene derivatives
作者:Fang Xie、Krishnamoorthy Sivakumar、Qingbing Zeng、Michael A. Bruckman、Blake Hodges、Qian Wang
DOI:10.1016/j.tet.2008.01.080
日期:2008.3
Fluorogenic reactions have broad applications in biolabeling, combinatorial synthesis of fluorescent dyes, and materials development. It was recently reported that the highly selective and efficient Cu(I)-catalyzed azide-alkyne cycloaddition (CuAAC) reaction can be employed in designing new types of fluorogenic reactions. In this study, we report a fluorogenic reaction using anthracene azides as starting materials. The fluorescence of the anthryl core can be greatly inhibited upon introducing electron-donating azido groups in the proximity. Such weakly fluorescent anthracene azides demonstrate high reactivity with a variety of alkynes under the CuAAC conditions producing a strongly fluorescent triazole product with high quantum yields. This reaction can be used in the synthesis and screening of fluorescent dyes combinatorially. Compared with most existing methods, the fluorogenic CuAAC reaction is a much milder and simpler technique to prepare large libraries of fluorescent dyes without further purification. In order to demonstrate the efficiency of using anthracene azides for biolabeling applications, both small molecules and biomolecules including the multialkyne-derivatized cowpea mosaic virus and tobacco mosaic virus had been studied. (C) 2008 Elsevier Ltd. All rights reserved.
Click chemistry from organic halides, diazonium salts and anilines in water catalysed by copper nanoparticles on activated carbon
An easy-to-prepare, reusable and versatile catalyst consisting of oxidised copper nanoparticles on activated carbon has been fully characterised and found to effectively promote the multicomponent synthesis of 1,2,3-triazoles from organic halides, diazonium salts, and aromatic amines in water at a low copper loading.