作者:Dietrich Spitzner、Peter Wagner、Arndt Simon、Karl Peters
DOI:10.1016/s0040-4039(00)95249-3
日期:1989.1
with kinetically controlled generated lithium dienolate 6a to form chiral bicyclo[2.2.2]octanes 4 with modest d.e.. It was found, that the diastereoselection is improved, when the corresponding trimethylsilyl ether 6b reacts with chiral acrylates under Lewis acid catalysis. The absolute stereochemistry of these bicyclo[2.2.2]octanes was determined by X-ray analysis.
几种手性丙烯酸酯(7b-f)与动力学控制生成的二烯酸锂6a反应,形成适度de的手性双环[2.2.2]辛烷4。已经发现,当相应的三甲基甲硅烷基醚6b在路易斯酸催化下与手性丙烯酸酯反应时,改善了非对映选择性。通过X射线分析确定这些双环[2.2.2]辛烷的绝对立体化学。