Diradical-Promoted (<i>n </i>+ 2 − 1) Ring Expansion: An Efficient Reaction for the Synthesis of Macrocyclic Ketones
作者:Georg Rüedi、Matthias A. Oberli、Matthias Nagel、Hans-Jürgen Hansen
DOI:10.1021/ol048701e
日期:2004.9.1
[reaction: see text] A diradical-promoted (n + 2 - 1) ringexpansionreaction based on vinyl side chain insertion (+2C) and decarbonylation (-1C) has been developed. Flash vacuum pyrolysis (FVP) of medium- and large-ring 2-trimethylsilyloxy-2-vinyl-cycloalkanones at 500-600 degrees C affords the one-carbon ring-expanded cycloalkanones in good yields. Methyl groups on the vinyl moiety are transformed
Preparation of 1,4-Cycloalkanediones by Hypoiodite Oxidation of Cycloalkanols
作者:Takasi Mori、Kiyohide Matsui、Hitosi Nozaki
DOI:10.1246/bcsj.43.231
日期:1970.1
Lead tetraacetate oxidation of 11, 12 and 13-membered cycloalkanols gives improved yields of 2,5-polymethylenetetrahydrofurans II in the presence of iodine. Oxidative cleavage of II furnishes 1,4-cycloalkanediones VII.
在碘存在下,11、12 和 13 元环烷醇的四乙酸铅氧化提高了 2,5-聚亚甲基四氢呋喃 II 的产率。II 的氧化裂解提供 1,4-环烷二酮 VII。