作者:Christoph Schneider、Ansgar Schuffenhauer
DOI:10.1002/(sici)1099-0690(200001)2000:1<73::aid-ejoc73>3.0.co;2-4
日期:2000.1
oxa-conjugate addition has been employed in a stereoselective synthesis of enantiopure polyalkyl-substituted tetrahydropyrans, which are frequently found as substructures in many natural products. The requisite cyclization precursors, 7-hydroxy-2-enimides 3 and 7-hydroxy-2-enoates 6 were easily accessible by silyloxy Cope rearrangements of the appropriate chiral syn-aldols. It was found that the stereoselectivity
分子内氧杂偶联物加成已用于立体选择性合成对映纯多烷基取代的四氢吡喃,其经常作为许多天然产物的亚结构被发现。必要的环化前体,7-羟基-2-烯酰亚胺3和7-羟基-2-烯酸酯6很容易通过适当手性合成羟醛的甲硅烷氧基Cope重排获得。发现环化的立体选择性可以通过羧酸衍生物的明智选择来控制,导致酰亚胺的动力学控制反应和酯的热力学控制过程。概述了可以解释过程立体控制的机械注意事项。