Environmentally Benign Preparation of Heteroaromatics from Ketones or Alcohols, with Macroporous Polystyrenesulfonic Acid and (Diacetoxyiodo)benzene, Followed by Thioamide, Amidine, and 2-Aminopyridine - Ueno, Makoto; Togo, Hideo (Synthesis, 2004)