Novel inhibitors of tyrosinase produced by the 4-substitution of TCT
作者:Jian Xu、Jing Liu、Xinqi Zhu、Yanying Yu、Shuwen Cao
DOI:10.1016/j.foodchem.2016.10.140
日期:2017.4
investigated their inhibitory activities and mechanisms on tyrosinase by using Spectrofluorimetry, 1H and 13C NMR titration and IR spectra. The results of the fluorescence spectra and NMR titrations showed that the thiosemicarbazone moiety formed complexes with copper ions in the activecenter of the enzyme and played an important role in inhibiting the activities of the target compounds. The 5-functionalization
Anion–cation co-operative catalysis by artificial sweetener saccharine-based ionic liquid for sustainable synthesis of 3,4-dihydropyrano[<i>c</i>]chromenes, 4,5-dihydropyrano[4,3-<i>b</i>]pyran and tetrahydrobenzo[<i>b</i>]pyrans in aqueous medium
作者:Himani Sharma、Suman Srivastava
DOI:10.1039/c8ra06889e
日期:——
tetrahydrobenzo[b]pyrans scaffolds through Domino Knoevenagel–Michael reaction. The easy recovery of the catalyst and high yield of the products make the protocol attractive, sustainable and economical. A mechanistic hypothesis is discussed using the concept of cooperativecatalysis based on the dual (electrophilic/nucleophilic) activation of reactants by [Bmim]Sac. Furthermore, dual hydrogenbonding of saccharinate
在这项研究中,糖精基离子液体 [Bmim]Sac 被发现是合成 3,4-二氢吡喃[ c ]色烯、4,5-二氢吡喃[4,3- b ]吡喃和通过 Domino Knoevenagel-Michael 反应形成四氢苯并[ b ]吡喃支架。催化剂的容易回收和产品的高产率使该协议具有吸引力、可持续性和经济性。使用基于[Bmim]Sac对反应物的双重(亲电/亲核)活化的协同催化概念讨论了机械假设。此外,糖精阴离子的双氢键在亲核试剂的活化中起重要作用。
[EN] PHARMACEUTICAL COMPOUNDS FOR THE TREATMENT OF COMPLEMENT MEDIATED DISORDERS<br/>[FR] COMPOSÉS PHARMACEUTIQUES POUR LE TRAITEMENT DE TROUBLES À MÉDIATION PAR COMPLÉMENT
申请人:ACHILLION PHARMACEUTICALS INC
公开号:WO2022066774A1
公开(公告)日:2022-03-31
This disclosure provides pharmaceutical compounds to treat medical disorders, such as complement-mediated disorders, including complement C1-mediated disorders.
这份披露提供了用于治疗医学障碍的药物化合物,例如补体介导的障碍,包括补体C1介导的障碍。
An Improved Preparation Method of Benzyl and Thenyl Triphenylphosphonium Salts
作者:Jian-Xin Zhang、Philippe Dubois、Robert Jérôme
DOI:10.1080/00397919608004613
日期:1996.8
Abstract New benzyl and thenyl phosphonium salts have been prepared by an improved method in solution from the parent alcohols and triphenylphosphine hydrobromide. Benzyl-type alcohols containing a tertiary amine can also be converted within high yields to phosphonium salts by removing the formed water by azeotropic distillation. Solvent (methylene chloride, chloroform and acetonitrile) and temperature
N-doped carbon layer-coated Au nanocatalyst for H2-free conversion of 5-hydroxymethylfurfural to 5-methylfurfural
作者:Jiang Zhang、Zijian Wang、Mugeng Chen、Yifeng Zhu、Yongmei Liu、Heyong He、Yong Cao、Xinhe Bao
DOI:10.1016/s1872-2067(21)64049-4
日期:2022.8
valuable chemicals has attracted intensive research interest in recent years, with product selectivity control remaining an important topic. Herein, TiO2 supported gold catalysts coated with a thin N-doped porous carbon (NPC) layer were developed via a polydopamine-coating-carbonization strategy and utilized for pathway-specific conversion of HMF into 5-methylfurfural (5-MF) with the use of renewable formic
近年来,将 5-氢甲基糠醛 (HMF) 脱氧升级为有价值的化学品引起了广泛的研究兴趣,其中产品选择性控制仍然是一个重要课题。在此,通过聚多巴胺涂层碳化策略开发了涂有薄 N 掺杂多孔碳 (NPC) 层的TiO 2负载金催化剂,并用于将 HMF 转化为 5-甲基糠醛 (5-MF)使用可再生甲酸 (FA) 作为脱氧试剂。制备的 Au/TiO 2@NPC 表现出优异的催化性能,5-MF (>95%) 的产率很高。Au@NPC 基催化剂的催化行为与高度分散的 Au 纳米颗粒的适当组合和 Au@NPC 核壳异质纳米结构中有利的界面相互作用相关,从而促进 HMF 与 FA 的优先酯化和抑制非生产性 FA 脱氢,从而以途径特异性的方式促进 HMF 中羟甲基的选择性甲酰化/脱羧。目前的 NPC/金属界面工程策略可能为合理设计用于生物质源转化的各种多相催化过程的先进催化剂提供潜在的指导。