title: Synthesis, structural and conformational properties, and gas phase reactivity of 1,4-dihydropyridine ester and ketone derivatives.
abstract: A new series of 4-aryl-2,6-dimethyl-1,4-dihydropyridines, characterized by ester or ketone functions at positions 3 and 5, has been synthesized. Structural and conformational properties, concerning the dihydropyridine ring and the orientation (synplanar/antiperiplanar) of the substituents have been investigated in their crystal structure and in solution by nuclear magnetic resonance. Evaluation of intermolecular and hydrogen bonding interactions as well as packing features, have been also carried out, evidencing interesting packing motifs. Their gas phase reactivity, as protonated and deprotonated molecules, has been investigated by electrospray ionization, high resolution and collision-induced dissociation multiple stage mass spectrometry. Deydrogenation reactions have been observed as a function of the capillary voltage.
authors.affiliation: Dipartimento di Chimica, Università di Siena, via Aldo Moro, 53100, Siena, Italy. gianluca.giorgi@unisi.it
authors.forename: Gianluca
authors.initials: G
authors.lastname: Giorgi
authors.forename: Mauro F A
authors.initials: MF
authors.lastname: Adamo
authors.forename: Fabio
authors.initials: F
authors.lastname: Ponticelli
authors.forename: Antonio
authors.initials: A
authors.lastname: Ventura
mesh_terms: D018360:Crystallography, X-Ray; D004095:Dihydropyridines / Q000737:chemistry*; D004952:Esters / Q000138:chemical synthesis*; D005740:Gases / Q000737:chemistry*; D006860:Hydrogen Bonding; D007659:Ketones / Q000138:chemical synthesis*; D008958:Models, Molecular; D015394:Molecular Structure; D011522:Protons
chemical_list: D004095:Dihydropyridines; D004952:Esters; D005740:Gases; D007659:Ketones; D011522:Protons; C038806:1,4-dihydropyridine