A bifunctional metal–organic framework platform for catalytic applications
摘要:
DUT-71 (DUT- Dresden University of Technology), a copper paddle wheel based framework, was used as a platform for postsynthetic modification to introduce specific catalytically active sites and to enhance the catalytic activity for fine chemicals production using bifunctional N-donor ligands such as dabco (1,4-diazabicyclo[2.2.2]octane) and 3,5-bis(1H-imidazol-1-yl)arene derivatives resulting in the corresponding networks DUT-72 and DUT-90. The intact network structure after functionalisation was confirmed by powder X-ray diffraction, the degree of functionalization was analysed by H-1 NMR, thermal and elemental analysis. As a model reaction, the C-C coupling reaction of Henry type catalysed by Lewis acids in presence of organic base was chosen. The influence of the functionalisation degree, solvent, and reaction temperature on the catalytic activities was studied. Finally, yields up to 77% of 2-nitro-1-(4nitrophenyl)ethan-1-ol in the reaction of 4-nitrobenzaldeyde with nitromethane were achieved using a dabco functionalised network DUT-72. (C) 2018 Elsevier Ltd. All rights reserved.
A bifunctional metal–organic framework platform for catalytic applications
摘要:
DUT-71 (DUT- Dresden University of Technology), a copper paddle wheel based framework, was used as a platform for postsynthetic modification to introduce specific catalytically active sites and to enhance the catalytic activity for fine chemicals production using bifunctional N-donor ligands such as dabco (1,4-diazabicyclo[2.2.2]octane) and 3,5-bis(1H-imidazol-1-yl)arene derivatives resulting in the corresponding networks DUT-72 and DUT-90. The intact network structure after functionalisation was confirmed by powder X-ray diffraction, the degree of functionalization was analysed by H-1 NMR, thermal and elemental analysis. As a model reaction, the C-C coupling reaction of Henry type catalysed by Lewis acids in presence of organic base was chosen. The influence of the functionalisation degree, solvent, and reaction temperature on the catalytic activities was studied. Finally, yields up to 77% of 2-nitro-1-(4nitrophenyl)ethan-1-ol in the reaction of 4-nitrobenzaldeyde with nitromethane were achieved using a dabco functionalised network DUT-72. (C) 2018 Elsevier Ltd. All rights reserved.
From rigid cyclic templates to conformationally stabilized acyclic scaffolds. Part I: The discovery of CCR3 antagonist development candidate BMS-639623 with picomolar inhibition potency against eosinophil chemotaxis
作者:Joseph B. Santella、Daniel S. Gardner、Wenqing Yao、Chongsheng Shi、Prabhakar Reddy、Andrew J. Tebben、George V. DeLucca、Dean A. Wacker、Paul S. Watson、Patricia K. Welch、Eric A. Wadman、Paul Davies、Kimberly A. Solomon、Dani M. Graden、Swamy Yeleswaram、Sandhya Mandlekar、Ilona Kariv、Carl P. Decicco、Soo S. Ko、Percy H. Carter、John V. Duncia
DOI:10.1016/j.bmcl.2007.11.067
日期:2008.1
Conformationalanalysis of trans-1,2-disubstituted cyclohexane CCR3 antagonist 2 revealed that the cyclohexane linker could be replaced by an acyclic syn-alpha-methyl-beta-hydroxypropyl linker. Synthesis and biological evaluation of mono- and disubstituted propyl linkers support this conformational correlation. It was also found that the alpha-methyl group to the urea lowered protein binding and that