Novel Generation of Pyridinium Ylides from N-(Silylmethyl)pyridone Analogs via 1,4-Silatropy and their 1,3-Dipolar Cycloadditions Leading to N-Heteropolycycles - Komatsu, Mitsuo; Kasano, Yukihiro; Yamaoka, Seiji; Minakata, Satoshi (Synthesis, 2003)