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Uracil-bearing poly(2-isopropyl-2-oxazoline): Hg(II)-selective control of its thermoresponsiveness

19-Jan-2018 | Jaehyuk Nam; Yongseok Jung; Woo-Dong Jang, Chemical Communication, 2018

A poly(2-isopropyl-2-oxazoline)-containing mercury ion (Hg2+)-responsive uracil moiety (U-PiPOx-U) was synthesized and it exhibited thermoresponsiveness in its aqueous solution. The changes in the UV-Vis absorption and thermoresponsiveness of U-PiPOx-U upon the addition of Hg2+ were studied. ...


Defect-free network formation and swelling behavior in ionic liquid-based electrolytes of tetra-arm polymers synthesized using a Michael addition reaction

19-Jan-2018 | Mari Yoshitake; Yuji Kamiyama; Kengo Nishi; Nobuko Yoshimoto; Masayuki Morita; Takamasa Sakai; Kenta Fujii, Physical Chemistry Chemical Physics, 2018

The gelation mechanism of tetra-arm poly(ethylene glycol) (TetraPEG) prepolymers via a Michael addition reaction was investigated from the viewpoint of chemical reaction kinetics. The polymer network was formed by mixing two different TetraPEGs functionalized with maleimide and thiol terminal ...


A Stereoselective Thiocyanate Conjugate Addition to Electron Deficient Alkynes and Concomitant Cyclization to N, S-Heterocycles

19-Jan-2018 | Vikas Dwivedi; Manda Rajesh; Ravi Kumar; Ruchir Kant; Maddi Sridhar Reddy, Chemical Communication, 2018

A regio- and stereoselective thiocyanate addition to ynones is achieved using KSCN in AcOH at 70 °C. The reaction is extendable to ynals, ynesulfones, ynoic acids and ynoates. Adducts from ynones were readily transformed into thiazine-2-thione derivatives under slightly modified reaction ...


A facile and green synthesis of MIL-100(Fe) with high-yield and its catalytic performance

19-Jan-2018 | Le Han; Hui Qi; Dan Zhang; Gan Ye; Wei Zhou; Changmin Hou; Wei Xu; Yinyong Sun, New Journal of Chemistry, 2018

MIL-100(Fe) is one of the important metal–organic frameworks due to its fascinating physicochemical properties. Generally, MIL-100(Fe) was synthesized under the conditions of adding HF and solvent. Here, we report that MIL-100(Fe) can be facilely synthesized without the addition of solvent and ...


Sydnone–alkyne cycloaddition: applications in synthesis and bioconjugation

19-Jan-2018 | Elodie Decuypère; Lucie Plougastel; Davide Audisio; Frédéric Taran, Chemical Communication, 2018

Sydnones are among the most popular mesoionic compounds studied so far for cycloaddition reactions. However, despite their good chemical stability and versatility, only a limited number of research groups have worked on their chemistry and use in organic synthesis. This feature article aims at ...


Mutual interference of Cu and Zn ions in Alzheimer's disease: perspectives at the molecular level

19-Jan-2018 | Elena Atrián-Blasco; Amandine Conte-Daban; Christelle Hureau, Dalton Transactions, 2018

While metal ions such as copper and zinc are essential in biology, they are also linked to several amyloid-related diseases, including Alzheimer's disease (AD). Zinc and copper can indeed modify the aggregation pathways of the amyloid-β (Aβ) peptide, the key component encountered in AD. In ...


Photosensitised regioselective [2+2]-cycloaddition of cinnamates and related alkenes

18-Jan-2018 | Santosh K. Pagire; Asik Hossain; Lukas Traub; Sabine Kerres; Oliver Reiser, Chemical Communication, 2018

An efficient method for the synthesis of substituted cyclobutanes from cinnamates, chalcones, and styrenes has been developed utilizing a visible-light triplet sensitisation mode. This reaction provides a diverse range of substituted cyclobutanes in high yields under mild conditions without the ...


Hexafluoroisopropanol mediated benign synthesis of 2H-pyrido[1,2-a]pyrimidin-2-ones by using a domino protocol

18-Jan-2018 | Zakeyah Alsharif; Mohamad Akbar Ali; Hessa Alkhattabi; Derika Jones; Evan Delancey; P. C. Ravikumar; Mohammad A. Alam, New Journal of Chemistry, 2018

A domino strategy has been used for the synthesis of 2H-pyrido[1,2-a]pyrimidin-2-ones. Four sequential reactions: aza-Michael addition, water elimination, intramolecular acyl substitution, and [1,3]-H shift were observed in this domino protocol. Hexafluoroisopropanol is used as a promotor and ...


A green and efficient method for the synthesis of pyrroles using a deep eutectic solvent ([CholineCl][ZnCl2]3) under solvent-free sonication.

18-Jan-2018 | Hai Truong Nguyen; Duy-Khiem Nguyen Chau; Phuong Hoang Tran, New Journal of Chemistry, 2018

An efficient deep eutectic solvent-based synthesis of pyrroles under ultrasound irradiation has been developed to provide a significant improvement of the yield up to 99% in a short reaction time. The synthesis of pyrroles is highly atom-economical, producing water as the sole byproduct. In ...


Metal-free diastereoselective construction of bridged ketal spirooxindoles via a Michael addition-inspired sequence

18-Jan-2018 | Yanshuo Zhu; Jing Zhou; Shaojing Jin; Huahui Dong; Jiaomei Guo; Xuguan Bai; Qilin Wang; Zhanwei Bu, Chemical Communication, 2018

A TfOH-catalyzed highly diastereoselective Michael addition/ketalization sequence of 3-hydroxyoxindoles and ortho-hydroxychalcones was developed, leading to biologically important bridged ketal spirooxindoles in moderate to excellent yields. Moreover, some chemical transformations were carried ...


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