Synthetic study on naturally occurring acetylenic spiroacetal enol ethers: The first access to optically active 3,4-diacetoxy-2-formylmethylene-1,6-dioxaspiro[4.5]decanes
作者:Hiroaki Toshima、Hisateru Aramaki、Akitami Ichihara
DOI:10.1016/s0040-4039(99)00579-1
日期:1999.4
keto-alcohol possessing an unsaturated aldehyde part via intramolecular conjugate addition. The C3- and C4-stereogenic centers were introduced via Sharpless asymmetric dihydroxylation of an acyclic conjugated ketone with modified AD-mix-α in high enantioselectivity (96% e.e.). This is the first access to optically active spiroacetal 2-enol ethers.
通过分子内共轭加成反应,由具有不饱和醛部分的无环酮醇合成了旋光的3,4-二乙酰氧基-2-甲酰基亚甲基-1,6-二氧杂螺[4.5]癸烷。C3-和C4-立体异构中心是通过无环共轭酮的Sharpless不对称二羟基化和修饰的AD-mix-α以高对映选择性(96%ee)引入的。这是光学活性螺缩醛2-烯醇醚的首次使用。