Discovery of triazines as selective PDE4B versus PDE4D inhibitors
摘要:
In this study we report a series of triazine derivatives that are potent inhibitors of PDE4B. We also provide a series of structure activity relationships that demonstrate the triazine core can be used to generate subtype selective inhibitors of PDE4B versus PDE4D. A high resolution co-crystal structure shows that the inhibitors interact with a C-terminal regulatory helix (CR3) locking the enzyme in an inactive 'closed' conformation. The results show that the compounds interact with both catalytic domain and CR3 residues. This provides the first structure-based approach to engineer PDE4B-selective inhibitors. (C) 2014 Elsevier Ltd. All rights reserved.
Experimental determination of the diffusion coefficient in two-dimensions in ferrous sulphate gels using the finite element method
作者:C. Baldock、P. J. Harris、A. R. Piercy、B. Healy
DOI:10.1007/bf03178282
日期:2001.3
To demonstrate the technique comparative diffusion measurements between ferroussulphate radiation dosimetry gels, with and without xylenol orange chelating agent and carbohydrate additives have been undertaken. Diffusion coefficients of 9.7 +/- 0.4, 13.3 +/- 0.6 and 9.5 +/- 0.8 10(-3) cm2h-1 were determined for ferroussulphate radiation dosimetry gels with and without xylenol orange and with xylenol
A method for the synthesis of methyl and ethyl 2-R-1-4-R-2-5-oxo-5,8-dihydropyrido[2,3-d]pyrimidine-7-carboxylates was proposed. The method is based on condensation of 2-R-1-6-R-2-5-acetyl-4-aminopyrimidines with ethyl oxalate in the presence of MeONa or EtONa. Products of the Friedlander self-condensation of the starting pyrimidines were also obtained.