Rearrangement Approaches to Cyclic Skeletons. IX. Stereoselective Total Synthesis of (±)-Camphorenone Based on a Ring-Contraction of Bicyclo[3.2.1]oct-6-en-2-one. Reliable One-Step Diazo Transfer Followed by a Wolff Rearrangement
作者:Tadao Uyehara、Naohiko Takehara、Masako Ueno、Toshio Sato
DOI:10.1246/bcsj.68.2687
日期:1995.9
onyl azide and potassium t-butoxide at −78 °C in THF. A Wolff rearrangement of the resulting α-diazoketones in the presence of water gave ring-contraction products, bicyclo[2.2.1]heptenecarboxylic acids. Using these two transformations the total synthesis of (±)-camphorenone was achieved stereoselectively, starting from 1-methoxybicyclo[2.2.2]oct-5-en-2-one.
双环[3.2.1]oct-6-en-2-ones和相关化合物的直接重氮转移反应是通过在-78°C的THF中用2,4,6-三异丙基苯磺酰基叠氮化物和叔丁醇钾处理来完成的。在水的存在下,所得α-重氮酮的沃尔夫重排得到环收缩产物,双环[2.2.1]庚烯羧酸。使用这两个转化,从 1-甲氧基双环 [2.2.2] oct-5-en-2-one 开始,立体选择性地实现了 (±)-樟脑酮的全合成。