Pre-clinical investigation of some aryl-piperidinyl ether histamine H3 receptor antagonists revealed a strong hERG binding. To overcome this issue, we have developed a QSAR model specially dedicated to H3 receptor ligands. This model was designed to be directly applicable in medicinal chemistry with no need of molecular modeling. The resulting recursive partitioning trees are robust (80-85% accuracy), but also simple and comprehensible. A novel promising lead emerged from our work and the structure-activity relationships are presented. (C) 2011 Elsevier Ltd. All rights reserved.
Synthesis and Antimicrobial Activity of Hydroxyalkyl- and Hydroxyacyl-phenols and Their Benzyl Ethers
New phenolic compounds with hydrophilic side chains were prepared from 4-benzyloxybenzaldehyde and alkenyl magnesium bromides, followed by Sharpless dihydroxylation and hydrogenolytic removal of the benzyl group. The resulting compounds were tested in an agar diffusion assay against gram positive bacteria, gram negative bacteria, and against the fungi Candida glabrata and Aspergillus niger.
Manganese-Promoted Oxidative Cyclization of Unsaturated Oximes Using Molecular Oxygen in Air under Ambient Conditions
A highly efficient manganese-promoted oxidative cyclization of unsaturated oximes to afford the corresponding 4,5-dihydroisoxazoline alcohols was developed. A very low loading (generally 0.1–0.2 mol-%) of Mn(acac)3 (acac = acetylacetonate) promoted the oxidative cyclization through the direct incorporation of molecular oxygen present in air (open flask) at room temperature.