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J Med Chem. 2014 Aug 28;57(16):7061-72. doi: 10.1021/jm500855w. Epub 2014 Aug 15.

Synthesis, biological evaluation, and molecular modeling of new 3-(cyclopentyloxy)-4-methoxybenzaldehyde O-(2-(2,6-dimethylmorpholino)-2-oxoethyl) Oxime (GEBR-7b) related phosphodiesterase 4D (PDE4D) inhibitors.

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Department of Pharmacy, Section of Medicinal Chemistry, School of Medical and Pharmaceutical Sciences, University of Genoa , Viale Benedetto XV, 3, 16132 Genoa, Italy.


A new series of 3-(cyclopentyloxy)-4-methoxyphenyl derivatives, structurally related to our hit GEBR-4a (1) and GEBR-7b (2), has been designed by changing length and functionality of the chain linking the catecholic moiety to the terminal cycloamine portion. Among the numerous molecules synthesized, compounds 8, 10a, and 10b showed increased potency as PDE4D enzyme inhibitors with respect to 2 and a good selectivity against PDE4A4, PDE4B2, and PDE4C2 enzymes, without both cytotoxic and genotoxic effects. The ability to enhance cAMP level in neuronal cells was assessed for compound 8. SAR considerations, also confirmed by in silico docking simulations, evidenced that both chain and amino terminal function characterized by higher hydrophilicity are required for a good and selective inhibitor-catalytic pocket interaction.

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