Synthesis of Cycloocta-3,5-dien-1-ol and Cycloocta-3,5-dien-1-one: SeO2/O2 Oxidation of Dienes
作者:Elena S. Koltun、Steven R. Kass
DOI:10.1055/s-2000-7107
日期:——
A useful synthesis of cycloocta-3,5-dien-1-ol was developed starting from cycloocta-1,3-diene. Oxidation of the diene with selenium oxide in refluxing acetic anhydride affords the homoallylic and allylic acetates in a 19 : 1 ratio and a 36% overall yield when O2 is bubbled through the reaction mixture. Subsequent reduction with LAH affords the homoallylic alcohol (95%), which can be readily oxidized via TPAP/N-MMO (73%) to the corresponding non-conjugated dienone. This route represents the most efficient method for the preparation of cycloocta-3,5-dien-1-ol and cycloocta-3,5-dien-1-one reported to date, and may provide a general approach to the synthesis of homoallylic alcohols and non-conjugated enones.
以环辛-1,3-二烯为原料,开发了一种有用的环辛-3,5-二烯-1-醇合成方法。在回流的乙酸酐中用氧化硒氧化二烯,得到比例为19:1的高烯丙基乙酸酯和烯丙基乙酸酯,当向反应混合物中通入O2时,总产率为36%。随后用 LAH 还原得到高烯丙醇 (95%),它可以很容易地通过 TPAP/N-MMO (73%) 氧化成相应的非共轭二烯酮。该路线代表了迄今为止报道的制备环辛基3,5-二烯-1-醇和环辛基-3,5-二烯-1-酮的最有效方法,并可能为高烯丙醇的合成提供通用方法。和非共轭烯酮。