An Efficient Approach to Original Substituted 2-Arylidene-2H-[1,4]-oxazin-3(4H)-ones via a Tandem Intramolecular P(O→C) Migration/Horner-Wadsworth-Emmons Olefination Sequence - Claveau, Elise; Gillaizeau, Isabelle; Coudert, Gérard (Synlett, 2009)