Electroreductive crossed pinacol coupling of aromatic ketones with aliphatic ketones and aldehydes
作者:Naoki Kise、Yousuke Shiozawa、Nasuo Ueda
DOI:10.1016/j.tet.2007.04.050
日期:2007.6
The intermolecular crossed pinacol coupling of aromatic ketones with aliphatic aldehydes and ketones was effected by electroreduction in the presence of chlorotrimethylsilane. The best result was obtained using a Pb cathode in Bu4NPF6/THF. The electroreduction of aromatic 1,4-, 1,5-, and 1,6-diketones under the same conditions gave four-, five-, and six-membered 1,2-diols with trans-stereoselectivity
芳族酮与脂族醛和酮的分子间交叉频哪醇偶联是在氯代三甲基硅烷存在下通过电还原实现的。使用Bu 4 NPF 6 / THF中的Pb阴极可获得最佳结果。在相同条件下电还原芳族1,4-,1,5-和1,6-二酮可得到具有反式立体选择性的四元,五元和六元1,2-二醇TiCl 4 -Zn的二酮主要产生相同分子内交叉频哪醇偶联产物的顺式异构体。