Allylsilane and diallylsilane reactions with functionalized ethylene ketals or benzodioxoles
作者:Nicolas Galy、Delphine Moraleda、Maurice Santelli
DOI:10.1016/j.tet.2010.12.045
日期:2011.2
The bis-allylation of ethylene ketal and catechol ketal derivatives of 2,5-hexanedione occurred with a great stereoselectivity. The tetraallylation of bis-catechol ketal derivatives of 2,5-hexanedione and 2-methyl-1,3-cyclohexanedione or the diallylation of 4-phenylbutan-2-one derivatives arise in good yields and these compounds were suitable substrates for ring-closing metathesis leading to 4,4-dialkylcyclopentenes
2,5-己二酮的乙烯缩酮和邻苯二酚缩酮衍生物的双烯丙基化具有很大的立体选择性。2,5-己二酮和2-甲基-1,3-环己烷二酮的双邻苯二酚缩酮衍生物的四烯丙基化或4-苯基丁烷-2-酮衍生物的二烯丙基化的收率很高,这些化合物是用于闭环的合适底物易位导致4,4-二烷基环戊烯。1,8-双三甲基甲硅烷基-2,6-辛二烯(Bistro)与4-苯基丁烷-2-一邻苯二酚缩酮衍生物或2-甲基环己-1,3-二酮单邻苯二酚缩酮的缩合反应可得到高产率的环状和三环产物12或分别为23。