... SYNTHESIS OF 11-DEOXYANTHRACYCLINONE PRECURSOR. A NEW STRATEGY TOWARD TETRACYCLIC SYSTEM VIA TANDEM 1,4/[4+2] ADDITION 1) Yoshinori NARUTA, Masanori KASHIWAGI, Yutaka NISHIGAICHI, Hidemitsu UNO, and Kazuhiro MARUYAMA* Department of Chemistry, Faculty of Science, Kyoto University, Sakyo-ku, Kyoto 606 Direct and regioselective reaction of 2, 4-pentadienyltrimethyl- ...