作者:Timothy J Donohoe、Jean-Baptiste Guillermin、Andrew A Calabrese、Daryl S Walter
DOI:10.1016/s0040-4039(01)01151-0
日期:2001.8
Chiral derivatives of 3-silyl-2-furoic acid were prepared and subjected to a Birch reductive alkylation reaction. It was found that the presence of a silicon atom, ortho to the chiral auxiliary, enabled the synthesis of dihydrofurans with high levels of stereoselectivity. We believe that the silicon group is essential in order to control the geometry of the enolate formed in the reduction regime. Remarkably
制备3-甲硅烷基-2-糠酸的手性衍生物,并使其进行桦木还原烷基化反应。已经发现,手性助剂邻位的硅原子的存在使得能够合成具有高立体选择性的二氢呋喃。我们认为,硅基对于控制还原体系中形成的烯醇化物的几何形状至关重要。值得注意的是,可以调整部分还原条件,以便在呋喃衍生的烯醇化物烷基化之前就地除去硅。