Diastereoselective Reaction of Buta-1,3-diene with Chiral Derivatives of Glyoxylic Acid: Effective Route to Optically Pure 2-Substituted 3,6-Dihydro-2H-pyrans - Kosior, Magorzata; Asztemborska, Monika; Jurczak, Janusz (Synthesis, 2004)