New Synthetic Methods for Seven- and Eight-Membered Cyclic Ethers Based on the Ring-Expansion Reactions of Hydroxy or Lithioxy Methoxyallenylisochroman Derivatives
作者:Yoshimitsu Nagao、Satoru Tanaka、Kazuhiko Hayashi、Shigeki Sano、Motoo Shiro
DOI:10.1055/s-2004-815440
日期:——
The Pd(0)-catalyzed ring-expansion reactions of hydroxy methoxyallenyl-4,4-dialkylisochroman derivatives in the presence of P(o-tolyl) 3 proceeded smoothly via hydropalladation to give 3-benzoxepan-1-one derivatives in high yields. Treatment of isochroman-1-one derivatives with lithio methoxyallene followed by quenching the reaction with water furnished 3-benzoxocan-6-one derivatives in good yields
在 P(o-tolyl) 3 存在下,Pd(0)-催化的羟基甲氧基烯基-4,4-二烷基异色满衍生物的扩环反应通过氢化钯反应顺利进行,以高产率得到 3-benzoxepan-1-one 衍生物。用锂硫代甲氧基丙二烯处理 isochroman-1-one 衍生物,然后用水淬灭反应,以良好的收率提供 3-benzoxocan-6-one 衍生物。