Jan-Feb 1984 Reaction of 2,3-Diphenylpyrazine 1-Oxides with Acetic Anhydride Akihiro Ohta*, Masami Inoue, Junichi Yamada and Yasuhiko Yamada Tokyo College of Pharmacy, 1432-1 Horinouchi, Hachioji, Tokyo 192-03, Japan Teruo Kurihara and Toshihiro Honda Faculty of Sciences, Josai University, 1-1 Keyakidai, Sakado, Saitama 350-02, Japan Received July 12, 1983 Some 2,3-diphenylpyrazine 1-oxides were heated with acetic anhydride to give ...