Fluorescent periodic mesoporous organosilica nanoparticles dual-functionalized via click chemistry for two-photon photodynamic therapy in cells
作者:Jonas G. Croissant、Sébastien Picard、Dina Aggad、Maxime Klausen、Chiara Mauriello Jimenez、Marie Maynadier、Olivier Mongin、Guillaume Clermont、Emilie Genin、Xavier Cattoën、Michel Wong Chi Man、Laurence Raehm、Marcel Garcia、Magali Gary-Bobo、Mireille Blanchard-Desce、Jean-Olivier Durand
DOI:10.1039/c6tb00638h
日期:——
dual-functionalized nanoparticles were incubated with MCF-7 breast cancer cells. Two-photon confocal imaging demonstrated the endocytosis of the nanoparticles within cancer cells. Moreover, brief two-photon irradiation (3 scans of 1.57 s) at 760 nm at high laser power (3 W) was shown to induce 40% of cancer cell death demonstrating the potential of the dual-functionalized mesoporous organosilica nanoparticles for
evaluation of surface areas, pore dimensions, and catalyst loading. They were used in organocatalyzed Diels–Alder cycloadditions between cyclopentadiene and different aldehydes, affording results comparable to those obtained with the nonsupported catalyst (up to 91% yield and 92% ee in the model reaction between cyclopentadiene and cinnamic aldehyde). The catalysts were recovered from the reaction mixture
据报道,利用两个不同的锚定位点和两个不同的接头,在中孔二氧化硅纳米粒子上合成手性咪唑烷酮。催化剂1 - 4制备来自开始升-苯丙氨酸或升-酪氨酸甲基酯和通过接枝协议或叠氮化物-炔烃铜(I) -催化的环加成支撑所述咪唑啉酮在硅胶上。四种催化剂均通过固态NMR N 2进行了充分表征物理吸附,SEM和TGA,以提供结构评估,包括表面积,孔尺寸和催化剂载量的评估。它们用于环戊二烯与不同醛之间的有机催化Diels-Alder环加成反应,其结果可与无载体催化剂获得的结果相媲美(在环戊二烯与肉桂醛之间的模型反应中,收率高达91%,ee为92%)。通过简单的过滤或离心从反应混合物中回收催化剂。活性最高的催化剂循环使用两次,但催化效率有所降低,而ee的侵蚀也很小。
Stereoselective DielsAlder Reactions Promoted under Continuous-Flow Conditions by Silica-Supported Chiral Organocatalysts
with silica bearing chiral organocatalysts to realize chiral “homemade” reactors. The influence of the material properties and immobilization procedures on the chemical and stereochemical activities of the chiral HPLC columns was studied by performing organocatalyzed DielsAlder reactions between cyclopentadiene and α,β‐unsaturated aldehydes undercontinuous‐flowconditions. In some cases, excellent
Immobilization of Dipyridyl Complex to Magnetic Nanoparticle via Click Chemistry as a Recyclable Catalyst for Suzuki Cross-Coupling Reactions
作者:Lianxun Gao、Guanghua Lv、Wenpeng Mai、Rizhe Jin
DOI:10.1055/s-2008-1072597
日期:2008.5
A magnetic nanoparticle (MNP)-supported di(2-pyridyl)methanol palladium dichloride complex was prepared via click chemistry. The MNP-supported catalyst was evaluated in Suzuki coupling reaction in term of activity and recyclability in DMF. It was found to be highly efficient for Suzuki coupling reaction using aryl bromides as substrates and could be easily separated by an external magnet and reused in five consecutive runs without obvious loss of activity.
Magnetite tethered mesoionic carbene‐palladium (II): An efficient and reusable nanomagnetic catalyst for Suzuki‐Miyaura and Mizoroki‐Heck cross‐coupling reactions in aqueous medium
作者:Manjunatha Kempasiddhaiah、Vishal Kandathil、Ramesh B. Dateer、Balappa S. Sasidhar、Shivaputra A. Patil、Siddappa A. Patil
DOI:10.1002/aoc.4846
日期:2019.5
prepared MNPs‐MIC‐Pd nanomagnetic catalyst was used to catalyze the Suzuki–Miyaura and Mizoroki–Heck cross‐couplingreactions and exhibited excellent catalytic activity for various substrates under mild reaction conditions. Moreover, MNPs‐MIC‐Pd nanomagnetic catalyst could be easily and rapidly recovered by applying an external magnet. The recovered MNPs‐MIC‐Pd nanomagnetic catalyst exhibited very good