A Simple Synthetic Method for Tetraaza[3.3.3.3]meta- and paracyclopanes by Alkylation of N-Substituted Trifluoroacetamide - Shinmyozu, Teruo; Shibakawa, Nobuhiko; Sugimoto, Ken'ichi; Sakane, Hiroko; Takemura, Hiroyuki; Sako, Katsuya; Inazu, Takahiko (Synthesis, 1993)