Syntheses of 2-Pyrones via Electrophilic Substitutions at C7 of 4-Hydroxy-6-methyl-2-pyrone through Mono- or Dianion Formation - Zhang, Xuejun; McLaughlin, Michael; Muñoz, R Lizeth P; Hsung, Richard P; Wang, Jiashi; Swidorski, Jacob (Synthesis, 2007)