A Facile and Convenient Synthetic Method for N-β-Trifluoroacetylvinyl Amino Acid Esters, α-Aminoacetophenones and Aminoacetonitriles as Potentially Useful Precursors of Fluorine-Containing Pyrroles - Okada, Etsuji; Masuda, Ryoichi; Hojo, Masaru; Inoue, Ryohei (Synthesis, 1992)