Latest ArticlesHere we use nor-seco-cucurbit[10]uril (ns-CB[10]) based ternary complexation to construct [5]rotaxane, linear supramolecular dynamic rotaxane polymers and cubic 3D supramolecular organic framework. A [5]rotaxane is constructed by ns-CB[10], TMeCB[6] and short linear derivatives of 4, 4′-bipyridinium (M2). ns-CB[10], CB[7] and long linear derivatives of 4, 4′-bipyridinium (M3) self-assemble into a linear supramolecular dynamic rotaxane polymer. ns-CB[10] and tetracationic tetrahedral monomer self-assemble and form a three-dimensional supramolecular organic framework. The above results demonstrate that ns-CB[10]-based ternary complexation is a versatile platform to build various supramolecular systems.
Multiple contiguous quaternary carbon stereocenters (CQS) are highly challenging, yet important structural motifs in organic synthesis. Here, we describe a visible light induced catalytic [2 + 2] cycloaddition approach that constructed up to four CQS in a pentacyclic fused ring system diastereoselectively, from the readily accessible dienamides with pendent heteroaryls. Variously substituted dienamides have been cyclized with heteroaryls to provide a range of novel CQS-containing scaffolds (26 examples, up to 96% yield and > 20:1 dr ratio). Mechanistic studies revealed that it may proceed through an uncommon β-C radical initiated 7-endo cyclization from the biradical intermediate.
The normal operation of lysosome, mitochondria, Golgi apparatus and endoplasmic reticulum plays a significant role in maintaining cell homeostasis. Reflecting the state and function of lysosomes, viscosity is a pivotal parameter to assess the stability of microenvironment. Herein, based on TICT mechanism, a new NIR pH-dependent fluorescent probe DCIC with push-pull electronic moiety was synthesized to identify the lysosomes viscosity. In viscous media, DCIC was highly sensitive to viscosity, fluorescence intensity increased by 180 times as viscosity increased from 1.0 cp to 438.4 cp. In addition, DCIC have high localization ability for lysosome, mitochondria, Golgi apparatus, and endoplasmic reticulum and can monitor lysosomal viscosity fluctuations with laser confocal microscopy.
In recent years, nanozymes have received more and more attention, but the low activity limits the development of nanozymes. Therefore, the design and development of efficient nanozymes is still a major challenge for researchers. Herein, the Fe,N co-doped ultrathin hollow carbon framework (Fe,N-UHCF) exhibit ultra-high peroxidase-like activity. The specific activity of Fe,N-UHCF nanozyme is as high as 36.6 U/mg, which is much higher than almost all of other reported nanozymes. In practical applications, the Fe,N-UHCF show good antibacterial effects.
As important emerging contaminants, antibiotics have caused potential hazards to the ecological environment and human health due to their extensive production and consumption. Among various techniques for removing antibiotics from wastewater, H2O2-based advanced oxidation processes (AOPs) have received increasing attention due to their fast reaction rate and strong oxidation capability. Hence this review critically discusses: (ⅰ) Recent research progress of AOPs with the addition of H2O2 for antibiotics removal through different methods of H2O2 activation; (ⅱ) recent advances in AOPs that can in-situ generate and activate H2O2 for antibiotics removal; (ⅲ) H2O2-based AOPs as a combination with other techniques for the degradation and mineralization of antibiotics in wastewater. Future perspectives about H2O2-based AOPs are also presented to grasp the future research trend in the area.
Catalytic asymmetric dearomatization of indoles and alkynes has received much attention in the past decade because this strategy offers an attractive and alternative way for the efficient synthesis of valuable chiral polycyclic indolines. However, these reactions have been mostly limited to transition-metal catalysts, and the related chiral Brønsted acid catalysis has been scarcely reported. Herein, we disclose a chiral phosphoric acid-catalyzed asymmetric dearomatization of indolyl ynamides by direct activation of alkynes. This metal-free method enables the practical and atom-economical construction of an array of valuable chiral polycyclic indolines in moderate to good yields with high enantioselectivities
Corneal neovascularization (CNV) is one of the major factors for vision impairment and blindness worldwide. The current treatment for CNV focuses primarily on topical eyedrops of glucocorticoids, non-steroidal anti-inflammatory drugs, electro-coagulation and laser photo-coagulation. Unfortunately, coagulation-based treatment is restricted by corneal hemorrhage and iris atrophy. And drug treatments have limited therapeutic effects and a short duration of action. Nanoparticle-based drug delivery systems are widely applied due to their improved pharmacokinetics, optimized drug targeting and enhanced biocompatibility. In this article, we provide a comprehensive and systematic overview of the CNV nanodrug system, highlighting some of the recent advances in nanodrug design, preparation, and functional modification. Moreover, we discuss the challenges in the clinical translation and potential risks in CNV treatment. A greater effort is needed for the potential applications of nanotechnology in the field of ophthalmology.
β-Cyclodextrin (β-CD) based materials have attracted great attention in the separation of hydrophilic glycopeptides due to the abundant hydroxyl groups in its exterior. However, the current materials based on β-CD generally has complex synthesis process and harsh experimental conditions, on the other hand, the interior cavity of β-CD is hydrophobic and is harmful to capture glycopeptides. Herein, a novel hydrophilic material based on β-CD was engineered via a self-assembly process utilizing l-cysteine (l-Cys) or glutathione (GSH) derived adamantane for highly efficient glycopeptide enrichment. It is the first attempt to make use of the hydrophobic interior cavity of β-CD for hydrophilic glycopeptide capture. Taking advantages of strong hydrophilicity and superparamagnetism, the as-prepared materials possess low detection limit, high selectively, and excellent reusability when employed to glycopeptide enrichment. In addition, the feasibility of the hydrophilic material based on β-CD was verified by enriching glycopeptides from human serum and saliva samples. This study provides a heuristic strategy for the application of β-CD-based self-assembly materials in the enrichment of glycopeptides. Importantly, this strategy certified a possible that the change of glycopeptide enrichment sites through host-guest interaction between β-CD and adamantane derivatives with different functional groups.
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