A water‐soluble Pd6 trigonal prism (A) was synthesized by two‐component coordination‐driven self‐assembly of a PdII 90° acceptor with a tetraimidazole donor. The walls of the prism are constructed by three conjugated aromatic building blocks, which means that the confined pocket of the prism is hydrophobic. In addition to the hydrophobic cavity, large product egress windows make A an ideal molecular
通过Pd II 90°受体与四咪唑供体的两组分配位驱动自组装合成了水溶性Pd 6三角棱镜(A)。棱镜的壁由三个共轭芳族结构块构成,这意味着棱镜的受限腔是疏水的。除了疏水腔外,大的产品出口窗口还使A一个理想的分子容器,可以在水性介质中的有限纳米空间中催化其他挑战性的假多组分脱水反应。这项研究是通过使用超分子分子容器微调反应条件来选择性生成中间四酮和黄嘌呤的尝试。而且,在相似的反应条件下,在不存在A的情况下,脱水产物的收率差或无收率,都支持了桶的密闭空间在水中促进这种反应的能力。此外,我们专注于锚定在Pd II配位结构中的基于四苯基乙烯的四咪唑单元的刚性化;在有水的情况下使依赖于阴离子的聚集诱导的发射成为可能。
Introduction of taurine (2-aminoethanesulfonic acid) as a green bio-organic catalyst for the promotion of organic reactions under green conditions
作者:Farhad Shirini、Nader Daneshvar
DOI:10.1039/c6ra15432h
日期:——
derivatives are simply prepared via a three-component reaction in the presence of taurine as the catalyst. All these reactions are performed in water, a green solvent. The advantages of using of taurine as the catalyst are it is environmentally friendly, low cost, commercially available, easy to separate from the reaction mixture, and has high reusability. Use of this catalyst results in acceptable reaction
Organocatalytic Sequential One-Pot Double Cascade Asymmetric Synthesis of Wieland−Miescher Ketone Analogues from a Knoevenagel/Hydrogenation/Robinson Annulation Sequence: Scope and Applications of Organocatalytic Biomimetic Reductions
作者:Dhevalapally B. Ramachary、Mamillapalli Kishor
DOI:10.1021/jo070277i
日期:2007.7.1
practical and novel organocatalytic chemo- and enantioselective process for the cascade synthesis of highly substituted 2-alkyl-cyclohexane-1,3-diones and Wieland−Miescher (W−M) ketone analogs is presented via reductive alkylation as a key step. First time, we developed the one-step alkylation of dimedone and 1,3-cyclohexanedione with aldehydes and Hantzsch ester through an organocatalytic reductive alkylation
Preparation and study of the catalytic application in the synthesis of xanthenedione pharmaceuticals of a hybrid nano-system based on copper, zinc and iron nanoparticles
pharmaceutical derivatives from aldehyde and dimedone. Due to the magnetic behavior of the catalyst, the purification process is carried out with high convenience. Herein, a plausible mechanism for the catalytic process is suggested and reusability of the presented catalyst is also investigated. In this report, it has been well-proven that high reaction yields are obtained for xanthenedione derivatives under
Increased expression of efflux transport proteins confers the Multi DrugResistant (MDR) phenotype to drugresistant bacteria, which can be mitigated by effluxpumpinhibitors (EPI). EPI's have the dual advantage of restoring efficacy of antibiotics and retarding the evolution of drugresistant mutants. In this study, 17 heterocyclic derivatives synthesized by a polyethylenimine (PEI) catalyzed one-pot