title: Ionic vs pericyclic transition states for the cyclization reactions of C alpha-N anions derived from amides and phosphinamides.
abstract: [structure: see text] Ab initio and DFT calculations indicate that the anionic cyclization of vinyl- and phenyl-carboxamides and phosphinamides metalated at the C(alpha)-N carbon fits better to a Michael-type ionic addition than to an electrocyclic ring closure. The lithium atom has no influence on the type of reaction mechanism.
authors.affiliation: Departamento de Química Orgánica e Inorgánica, Universidad de Oviedo, c/Julián Clavería 8, 33006, Oviedo, Spain.
authors.forename: Antonio Morán
authors.initials: AM
authors.lastname: Ramallal
authors.forename: Fernando
authors.initials: F
authors.lastname: López-Ortiz
authors.forename: Javier
authors.initials: J
authors.lastname: González