Mauro Angiolini

Synthesis and SAR of new pyrazolo[4,3-h]quinazoline-3-carboxamide derivatives as potent and selective MPS1 kinase inhibitors

The synthesis and SAR of a series of novel pyrazolo-quinazolines as potent and selective MPS1 inhibitors are reported. We describe the optimization of the initial hit, identified by screening the internal library collection, into an orally available, potent and selective MPS1 inhibitor.

Synthesis of Azabicycloalkane Amino Acid Scaffolds as Reverse-Turn Inducer Dipeptide Mimics

In an effort to design dipeptide structural mimics of protein and peptide reverse-turns, a series of 5,5-, 6,5-, and 7,5-fused 2-oxo-1-azabicycloalkane amino acids has been synthesized. A new and convenient synthetic route utilizing a Horner−Emmons reaction followed by double-bond reduction has been used to prepare the bicyclic lactams in high yields.

Structure-Based Optimization of Potent Pdk1 Inhibitors.

In this Letter is described the structure-based design of potent dihydro-pyrazoloquinazolines as PDK1 inhibitors. Starting from low potency HTS hits with the aid of X-ray crystallography and modeling, a medicinal chemistry activity was carried out to improve potency versus PDK1 and selectivity versus CDK2 protein kinase.

Design and synthesis of conformationally constrained arginal thrombin inhibitors

A series of conformationally constrained arginal thrombin inhibitors was prepared starting from 5,6 or 5,7 bicyclic lactamic structures, that an indirect approach of X-ray structure-based drug design indicated as D-Phe-Pro dipeptide mimetics. The tetrahydroquinolyl sulfonamido derivative Ig (LR-D/009) displayed the best inhibitory potency (IC50 = 0.018 μm), with good selectivity over plasmin and trypsin.

Stereoselective synthesis of 6,5-bicyclic reverse-turn peptidomimetics

Abstract A flexible stereoselective synthetic scheme was developed to prepare 6,5-fused bicyclic lactams, that molecular mechanics calculations revealed to have a potential as reverse-turn mimetics. The convergence of the synthetic sequence was achieved by attachment of a properly substituted malonate unit to the (2S)-cis-5-(2-hydroxyethyl)proline tert-butyl ester. Stereoselective intramolecular alkylation of the malonate afforded the 6-membered lactam fused to the 2-carbalkoxy pyrrolidine nucleus. X-ray diffraction analysis of a more advanced synthetic derivative allowed the unequivocal assignment of the configuration at the newly created quaternary stereocenter as R.

Design and synthesis of nonpeptide angiotensin II receptor antagonists featuring acyclic imidazole-mimicking structural units

Extensive molecular modelling studies, including conformational analysis and the comparison of molecular electrostatic potential distributions, wee used to evaluate structural parameters of new antagonists containing acyclic replacements of the N = C-N imidazole region. The synthesis and the biological screening of a series of acyl biphenyltetrazole derivatives were planned and realized to gain an insight into the structure-activity relationships of this unusual class of Angiotensin II antagonists.