Reactions in Elastomeric Nanoreactors Reveal the Role of Force on the Kinetics of the Huisgen Reaction on Surfaces
摘要:
The force dependence of the copper-free Huisgen cycloaddition between an alkyne and a surface-bound azide was examined in elastomeric nanoreactors. These studies revealed that pressure and chain length are critical factors that determine the reaction rate. These experiments demonstrate the central role of pressure and surface structure on interfacial processes that are increasingly important in biology, materials science, and nanotechnology.
A click-based modular approach to introduction of peroxides onto molecules and nanostructures
作者:Alissa Horn、Patrick H. Dussault
DOI:10.1039/d0ra09088c
日期:——
Copper-promoted azide/alkyne cycloadditions (CuAAC) are explored as a tool for modular introduction of peroxides onto molecules and nanomaterials. Dialkyl peroxide-substituted alkynes undergo Cu(I)-promoted reaction with azides in either organic or biphasic media to furnish peroxide-substituted 1,2,3-triazoles. Heterolytic fragmentation of the peroxide to an aldehyde, a side reaction that appears to
Selective inhibition of β-N-acetylhexosaminidases by thioglycosyl–naphthalimide hybrid molecules
作者:Wei Chen、Shengqiang Shen、Lili Dong、Jianjun Zhang、Qing Yang
DOI:10.1016/j.bmc.2017.11.042
日期:2018.1
To develop selective inhibitors for beta-N-acetylhexosaminidases which are involved in a myriad of physiological processes, a series of novel thioglycosyl-naphthalimide hybrid inhibitors were designed, synthesized and evaluated for inhibition activity against glycosyl hydrolase family 20 and 84 (GH20 and GH84) beta-N-acetylhexosaminidases. These compounds which incorporate groups with varied sizes and lengths at the linker region between thioglycosyl moiety and naphthalimide moiety are designed to improve the selectivity and stacking interactions. The GH84 human O-GlcNAcase (hOGA) was sensitive to the subtle changes in the linker region and the optimal choice is a small size linker with six atoms length. And the GH20 insect beta-N-acetylhexosaminidase OfHex1 could tolerate compounds with a hydrophobic bulky linker. Especially, the compound 5c (hOGA, K-i = 3.46 mu M; OfHex1, K-i > 200 mu M) and the compound 6f (hOGA, K-i > 200 mu M; OfHex1, K-i = 21.81 mu M) displayed high selectivity. The molecular docking results indicated that the inhibition mechanism was different between the two families due to their different structural characteristics beyond the active sites. These results provide some promising clues to improve selectivity of potent molecules against beta-N-acetylhexosaminidases. (C) 2017 Elsevier Ltd. All rights reserved.
Reactions in Elastomeric Nanoreactors Reveal the Role of Force on the Kinetics of the Huisgen Reaction on Surfaces
作者:Xu Han、Shudan Bian、Yong Liang、K. N. Houk、Adam B. Braunschweig
DOI:10.1021/ja504137u
日期:2014.7.30
The force dependence of the copper-free Huisgen cycloaddition between an alkyne and a surface-bound azide was examined in elastomeric nanoreactors. These studies revealed that pressure and chain length are critical factors that determine the reaction rate. These experiments demonstrate the central role of pressure and surface structure on interfacial processes that are increasingly important in biology, materials science, and nanotechnology.
Plasmon Resonance Scattering Spectroscopy at the Single-Nanoparticle Level: Real-Time Monitoring of a Click Reaction
作者:Lei Shi、Chao Jing、Wei Ma、Da-Wei Li、Jonathan E. Halls、Frank Marken、Yi-Tao Long
DOI:10.1002/anie.201301930
日期:2013.6.3
A method based on plasmonresonance Rayleigh scattering (PRRS) spectroscopy and dark‐field microscopy (DFM) was established for the real‐time monitoring of a clickreaction at the single‐nanoparticle level. Clickreactions on the surface of single gold nanoparticles (GNPs) result in interparticle coupling, which leads to a red‐shift of the λmax (Δλmax=43 nm) in the PRRS spectra and a color change of