New Synthetic Methods for Seven- and Eight-Membered Cyclic Ethers Based on the Ring-Expansion Reactions of Hydroxy or Lithioxy Methoxyallenylisochroman Derivatives - Nagao, Yoshimitsu; Tanaka, Satoru; Hayashi, Kazuhiko; Sano, Shigeki; Shiro, Motoo (Synlett, 2004)