Rhodium(<scp>ii</scp>) catalyzed synthesis of macrocycles incorporating oxindole via O–H/N–H insertion reactions
作者:Sengodagounder Muthusamy、Thangaraju Karikalan
DOI:10.1039/c4ob01671h
日期:——
an oxindole unit were synthesized in good yield via rhodium(II) acetate dimer catalyzed intramolecular O–H/N–H insertion reactions. Interestingly, synthesis of C2-symmetric macrocycles in moderate yield was also demonstrated via head to tail dimerization involving double intermolecular O–H insertion when the spacer length was decreased. The synthesis of chiral macrocycles was also delineated. This study
Metalloporphyrins were immobilized on biogenous iron oxide (BIO) produced by iron-oxidizing bacteria, Leptothrix ochracea. These organic–inorganic hybrid materials were used as immobilized catalysts for the synthesis of cyclic carbonates from epoxides and CO2 under solvent-free conditions. ZnII porphyrin immobilized via four tetraalkylammonium bromide groups showed high catalytic activity and reusability at a catalyst loading of 0.1 mol%. The product was obtained in 99% yield after nine times reuse, and the substrate scope was broad.
Bisimidazole-functionalized cobaltoporphyrin acted as efficient bifunctional catalysts to facilitate the synthesis of cyclic carbonates from epoxides and CO2.
双咪唑官能化的钴卟啉充当有效的双官能催化剂,以促进由环氧化物和CO 2合成环状碳酸酯。
Chiral Bifunctional Metalloporphyrin Catalysts for Kinetic Resolution of Epoxides with Carbon Dioxide
作者:Chihiro Maeda、Mayato Mitsuzane、Tadashi Ema
DOI:10.1021/acs.orglett.9b00447
日期:2019.3.15
triazolium halide units were synthesized as bifunctional catalysts for kinetic resolution of epoxides with CO2. Several catalysts were screened by changing the linker length and nucleophilic counteranions, and the optimized catalyst accelerated the enantioselective reaction at ambient temperature to produce optically active cyclic carbonates and epoxides.
Design, synthesis, in-silico and biological evaluation of novel chalcone derivatives as multi-function agents for the treatment of Alzheimer's disease
作者:Zhipei Sang、Keren Wang、Pengfei Zhang、Jian Shi、Wenmin Liu、Zhenghuai Tan
DOI:10.1016/j.ejmech.2019.07.021
日期:2019.10
A series of novel chalconederivatives was designed, synthesized and evaluated as multifunctionalagents for the treatment of AD. Among of these synthesized compounds, compound TM-2 was a selective BuChE inhibitor (IC50 = 2.6 μM) and selective MAO-B inhibitor (IC50 = 5.3 μM), which were supported by docking study. Compound TM-2 also showed good antioxidant activity, and was a selective metal chelator