Purine derivatives with heterocyclic moieties and related analogs as new antitumor agents.

Aim: Identification of new antiproliferative compounds.

Methodology: Four series of compounds were synthesized by the Mitsunobu reaction. Their antiproliferative activity was studied against several cancer cells and a noncancerous fibroblast cell line.

Quinazolinones, Quinazolinthiones, and Quinazolinimines as Nitric Oxide Synthase Inhibitors: Synthetic Study and Biological Evaluation.

The synthesis of different compounds with a quinazolinone, quinazolinthione, or quinazolinimine skeleton and their in vitro biological evaluation as inhibitors of inducible and neuronal nitric oxide synthase (iNOS and nNOS) isoforms are described. These derivatives were obtained from substituted 2-aminobenzylamines, using diverse cyclization procedures. Furthermore, the diamines were synthesized by two routes: A conventional pathway and an efficient one-pot synthesis in a continuous-flow hydrogenator.

New coumarin-based fluorescent melatonin ligands. Design, synthesis and pharmacological characterization.

The design and synthesis of a series of new fluorescent coumarin-containing melatonin analogues is presented. The combination of high-binding affinities for human melatonergic receptors (h-MT₁R and h-MT₂R) and fluorescent properties, derived from the inclusion of melatonin pharmacophoric elements in the coumarin scaffold, yielded suitable candidates for the development of MT₁R and MT₂R fluorescent probes for imaging in biological media.

Derivatization of (quinolin-8-yl)phosphinimidic amides via ortho-lithiation revisited.

5The direct ortho-lithiation of N-H containing (quinolin-8-yl)phosphinimidic amides by reaction with 1 equiv. of n-BuLi described by Wang and co-workers has been re-examined. The multinuclear magnetic resonance ((1)H, (2)H, (7)Li, (13)C, (15)N and (31)P) study of the species formed in the monolithiation of N-(tert-butyl)-P,P-diphenyl-N'-(quinolin-8-yl)phosphinimidic amide 5 with n-BuLi in THF showed that proton abstraction occurred exclusively and quantitatively at the NH.