Kimihiro Komeyama,à Ryoichi Igawa, Takayuki Morimoto, and Ken Takakià Department of Chemistry and Chemical Engineering, Graduate School of Engineering, Hiroshima University, 1-4-1 Kagamiyama, Higashi-Hiroshima 739-8527 ... (Received May 13, 2009; CL-090470; E-mail: kkome@hiroshima-u.ac.jp) ... Fe(OTf)3, was found to be a good catalyst for the cyclization of alkenyl N,O-acetals to give various nitrogen-containing heterocycles in high yields.