Regioselective synthesis of bis(silyl enol ethers) and bis(conjugated enones) through electron transfer from Mg metal
作者:Hirofumi Maekawa、Manabu Sakai、Tetsuro Uchida、Yoshio Kita、Ikuzo Nishiguchi
DOI:10.1016/j.tetlet.2003.10.122
日期:2004.1
choride (TMSCl) brought about facile and regioselective reductive dimerization to give the corresponding bis(silyl enol ethers), 1,6-bis(trimethylsilyloxy)-1,5-dienes. Similar Mg-promoted reductive dimerization of 1,3-cyclic diketones in the presence of TMSCl followed by acid-catalyzed hydrolysis led to selective formation of the corresponding 1,6-diketo-2,4-dienes in moderate to good yields.
在三甲基甲硅烷基氯(TMSCl)存在下用Mg金属处理α,β-不饱和酮可轻松实现区域选择性还原二聚,得到相应的双(甲硅烷基烯醇醚),1,6-双(三甲基甲硅烷氧基)-1,5 -dienes。在TMSC1存在下,类似的Mg促进的1,3-环二酮的还原还原二聚,然后酸催化的水解导致以中等至良好的收率选择性地形成相应的1,6-二酮-2,4-二烯。