With the aim of finding the structural features for the human MAO inhibitory activity and selectivity, in the present communication we report the synthesis, pharmacological evaluation and a comparative study of a new series of 3-phenylcoumarins (compounds 1–4) and 3-benzoylcoumarins (compounds ...

A series of β-d-ribofuranosyl coumarinyl-1,2,3-triazoles have been synthesized by Cu-catalyzed cycloaddition reaction between azidosugar and 7-O-/7-alkynylated coumarins in 62–70% overall yields. The in vitro antimycobacterial activity evaluation of the synthesized triazolo-conjugates against ...

A series of eight N1-(2′-O,4′-C-methylene-β-D-ribofuranonucleoside-3′-yl)-C4-(coumarin-7-oxymethyl)-1,2,3-triazoles have been synthesized by Cu(I)-catalyzed azide-alkyne cycloaddition reaction of 3′-azido-3′-deoxy-2′-O,4′-C-methyleneuridine and 3′-azido-3′-deoxy-2′-O,4′-C-methylene-5...

5-Substituted 7-methoxy-2-(4- or 3-methoxyphenyl)-4(1H)-quinolones 8–17 have been synthesised in good yields from the corresponding 7-methoxy-2-(4- or 3-methoxyphenyl)-5-trifluoromethanesulfonate-4(1H)-quinolones 7 via palladium-mediated cross-coupling reactions or aromatic nucleophilic substit...

We have developed versatile methods toward the synthesis of a variety of piperidine/piperazine bridged isosteres of pridopidine. The compounds were assessed against the D2 receptor in agonist and antagonist modes and against the D4 receptor in agonist mode. hERG Binding and the ADME profiles wer...

An amine-catalyzed asymmetric formal aza [3 + 3] cycloaddition of α,β-unsaturated aldehydes with N-Ts ketimines derived from both acyclic and cyclic ketones was developed, which was followed by an oxidation to afford chiral piperidine derivatives in good yields and excellent enantioselectiviti...

Enantiomeric analogues of 5-(3-hydroxyphenyl)morphan ligands were synthesized and evaluated because of our unexpected finding that opioid antagonists can be obtained in the 5-phenylmorphan series of opioids without sterically hindering the rotation of the phenolic ring. We determined the opioid ...

Herein we report a novel class of 1,4-disubstituted piperidines as potential anticancer agents. One-step and efficient synthesis of a structurally diverse library of piperidine-based analogs with five points of diversity has been developed using the Ugi four-component reaction. A structure–acti...

trans-3,4-Dimethyl-4-(3-carboxamidophenyl)piperidines constitute a novel class of μ opioid receptor antagonists. The CONH2 group was found to be an effective isostere of the phenolic OH moiety. Structure–activity relationships at the piperidine nitrogen position led to the identification of se...

A series of N-substituted trans-3,4-dimethyl-4-(3-hydroxyphenyl)piperidines, μ opioid receptor antagonists, analogs of alvimopan, were prepared using solid phase methodology. This study led to the identification of a highly selective μ opioid receptor antagonist, which interacts selectively wi...

Structure–activity relationships at the 2α-position of the piperidine ring of the trans-4,5-dimethyl-4-(3-hydroxyphenyl)piperidine μ-opioid antagonist series were investigated. This study showed that only small linear alkyl groups (methyl, propyl) are tolerated at the 2α-position of the pipe...

Binding of i.v. administered (+)-[3H]3-(3-hydroxyphenyl)-N-(1-propyl)piperidine ([3H]3-PPP) in the brain of intact mice is antagonized dose responsively by σ receptor ligands. The correlation of potencies for inhibition of binding in vivo and in vitro indicates that σ receptors in mouse brain ...

This chapter describes methods of synthesis, the pharmacological properties, and the use of derivatives of piperidine-based nonfused biheterocycles with C–N and C–C coupling.Piperidine-based nonfused biheterocycles with C–N coupling are presented as a series of drugs such as droperidol, benpe...

A series of novel piperazine or piperidine-containing non-covalent peptidyl derivatives possessing a neopentyl-asparagine residue were designed, synthesized and evaluated as proteasome inhibitors. All target compounds were screened for their 20S proteasome chymotrypsin-like inhibitory activities...

A series of arylalkanol-piperidine derivatives was synthesized, and their triple reuptake inhibition and in vivo activities have been evaluated. Among them, compounds 2a, 2j, 2k, 2m and 2n exhibited high potency for 5-HT, NA and DA transporters. Optimized compounds 2j and 2m showed significant r...

A phenethyl containing piperidinium compound was synthesized and the results of an X-ray crystallographic and computational analysis of this compound are reported. The compound, 1-[2-(2-methoxyphenyl)ethyl]piperidinium chloride, contains a C–H···O contact, which stabilizes the experimentally...

A convenient new method has been developed for preparation a series of 3-(substituted benzyl)piperidines by addition of substituted phenylmagnesium bromide to pyridine-3-carboxaldehyde followed by one pot deoxygenation and heteroaromatic ring saturation in the presence of palladium catalyst.

A concise and efficient method for the synthesis of 1,4-naphthoquinones has been successfully developed involving a CuI/Cu(OTf)2/DMSO system-catalyzed intramolecular oxidative cyclization of (o-alkynyl)arylketones. The present protocol provided a novel approach to access functionalized 1,4-napht...

Background: Recently developed tools for the genetic manipulation of modular polyketide synthases (PKSs) have advanced the development of combinatorial biosynthesis technologies for drug discovery. Although many of the current techniques involve engineering individual domains or modules of the P...

The final step in the biosynthesis of methymycin, neomethymycin, and picromycin is an hydroxylation, shown to be carried out by the cytochrome P-450 monooxygenase, PicK. Direct comparison of the relative kcatKm values for the two substrates, YC-17 and narbomycin, showed a threefold rate preferen...