Easy α-alkylation of ketones with alcohols through a hydrogen autotransfer process catalyzed by RuCl2(DMSO)4
作者:Ricardo Martínez、Diego J. Ramón、Miguel Yus
DOI:10.1016/j.tet.2006.07.013
日期:2006.9
indicate that the process goes through the oxidation of the alcohols with ruthenium (after a previous deprotonation) to yield the corresponding aldehyde and a ruthenium hydride intermediate. In turn, the aldehyde suffers a classical aldol reaction with the starting ketone to form the corresponding α,β-unsaturated ketone, which finally is reduced through a Michael-type addition by the aforementioned ruthenium
酮与醇的亲电子α-烷基化是通过RuCl 2(DMSO)4催化的氢自动转移过程完成的。仅通过选择合适的起始酮(分别为甲基酮或双环亚甲基酮)以及喹啉(通过使用2-氨基苄醇衍生物)或相应的醇,该反应即可生成简单的烷基化酮或α,β-不饱和酮。通过添加额外当量的初始醇衍生而来。在最后一种情况下,在上述烷基化过程之后,羰基化合物还原。机理研究似乎表明该过程经历了醇与钌的氧化(在先前的去质子化之后),得到了相应的醛和氢化钌中间体。反过来,醛与起始酮发生经典的醛醇缩合反应,形成相应的α,β-不饱和酮,