... V.” Synthesis of 1-Heteroar0ylpiperazine Derivatives HIDENORI OGAWA,* SHIGEHARU TAMADA, TAKAFUMI FUJIOKA, SHUJi ... 2) M. Tominaga, E. Yo, H. Ogawa, S. Yamashita, Y. Yabuuchi, and K ... 7) T. Shioiri, Y. Yokoyama, Y. Kasai, and S. Yamada, Tetrahedron, 32, 2211 ...