Synthesis and Binding Affinities of Novel SRIF-Mimicking β-d-Glucosides Satisfying the Requirement for a π-Cloud at C1

Synthesis of iminosugar derivatives presenting naphthyl and alkyl amine interacting groups and binding to somatostatin receptors

The synthesis of 1-deoxynojirimycin (DNJ) derivatives, presenting a 2-naphthylmethyl and an alkyl amino side chain, from l-sorbose is described.

Synthesis of Polycyclic Heterocycles via a One-Pot Ortho Alkylation/Direct Heteroarylation Sequence

[reaction: see text] Polycyclic thiophenes and furans were synthesized using a one-pot ortho alkylation/direct heteroarylation reaction sequence. Under the optimized reaction conditions, aryl iodides were coupled with 3-(bromoalkyl)thiophenes or -furans, affording six- and seven-membered annulated ring products via formation of two C-C bonds from two aryl C-H bonds.

Pharmacophore-guided drug discovery investigations leading to bioactive 5-aminotetrahydropyrazolopyridines. Implications for the binding mode of heterocyclic dopamine D3 receptor agonists

Taking advantage of a 3D-QSAR based pharmacophore hypothesis, synthesis and biological evaluation of dopaminergic 5-aminotetrahydropyrazolo[1,5-a]pyridines are described. The data displayed substantial and selective D3 receptor affinity for the heterocyclic test compound (+/-)-1 when the enantiomer (S)-1 turned out to be responsible for the D3 binding (K(i) (high) = 4.0 nM). (S)-1 exhibited binding affinity and ligand efficacy comparable to those of our previously described D3 agonist FAUC 54, when subtype selectivity could be significantly improved. The results indicate that the sp(2) nitrogens of the pyrazole and thiazole rings of the dopaminergics (S)-1 and pramipexole, respectively, are pharmacophoric elements of major importance. To provide putative explanations for the high affinity of (S)-1, computational studies were performed employing an active state D3 model.