Nucleophilic substitution reactions of diethyl 4-nitrophenyl phosphate triester: Kinetics and mechanism
作者:Enrique A. Castro、Daniela Ugarte、M. Fernanda Rojas、Paulina Pavez、José G. Santos
DOI:10.1002/kin.20605
日期:2011.12
Brønsted‐type plot (log kN vs. pKa nucleophile) obtained for the phenolysis is linear with slope β=0.21; no break was found at pKa 7.5, consistent with a concerted mechanism. The Brønsted‐type plots for the SA aminolysis and pyridinolysis are linear with slopes β=0.39 and 0.43, respectively, also suggesting concerted processes. The concerted mechanisms for the latter reactions are proposed on the basis
[EN] PYRAZOLOPYRIMIDINONE DERIVATIVES, PROCESS FOR THEIR PREPARATION AND THEIR USE<br/>[FR] DERIVES DE PYRAZOLOPYRIMIDINONE, LEUR PROCEDE DE PREPARATION ET LEUR UTILISATION
申请人:SK CHEMICALS CO LTD
公开号:WO2001087888A1
公开(公告)日:2001-11-22
This invention relates to a series of pyrazolopyrimidinone derivatives, having an excellent inhibiting activity against cyclic guanosine 3',5'- monophosphate specific phosphodiesterase (cGMP specific PDE; PDE V), process for their preparation, intermediates in their preparation, their uses as therapeutic agents, and pharmaceutical compositions containing them.