Oxidative Cleavage of <i>vic</i>-Diols Using Copper(II) Bromide-Lithium <i>t</i>-Butoxide: A New Route to Unsymmetrical 1,5- and 1,6-Diketones
作者:Tooru Fujiwara、Yumiko Tsuruta、Ko-ichi Arizono、Takeshi Takeda
DOI:10.1055/s-1997-970
日期:1997.8
Unsymmetrical 1,6-diketones were obtained by the copper(II) bromide-lithium t-butoxide oxidation of 1,2-disubstituted 1,2-cyclohexanediols. The diols were easily prepared by the addition of Grignard reagents to 2-trimethylsiloxy-2-cyclohexenone followed by the hydrolysis and treatment of the resulting 2-hydroxycyclohexanones with the second Grignard reagents. Similarly, 1,5-Diketones were obtained using 2-trimethylsiloxy-2-cyclopentenone as a starting material.
通过溴化铜(II)-叔丁醇锂氧化 1,2-二取代的 1,2-环己二醇,得到了不对称的 1,6-二酮。在 2-三甲基硅氧基-2-环己烯酮中加入格氏试剂,然后用第二种格氏试剂水解和处理得到的 2-羟基环己酮,就可以轻松制备出二元醇。同样,以 2-三甲基硅氧基-2-环戊烯酮为起始原料,也可以得到 1,5-二酮。