The transannular O-heterocyclization of 9-oxabicyclo[6.1.0] non-4-en-2-ols and 9-oxabicyclo[6.1.0] non-4-en-2-one by iodine-assisted oxirane ring expansion was studied. The stereo- and regioselectivity for the[4.2.1] vs[3.3.1] 10-oxabicyclo nonane skeletons are studied in terms of a tricyclic oxonium ion intermediate and rationalized by means of MNDO calculations.
研究了
碘辅助的
环氧乙烷环扩展对9-氧杂双环[6.1.0]非-4-烯-2-醇和9-氧杂双环[6.1.0]非-4-烯-2-酮的跨环O-杂环化作用。用
三环氧离子中间体研究了[4.2.1] vs [3.3.1] 10-氧杂双
环壬烷骨架的立体选择性和区域选择性,并通过MNDO计算对其进行了合理化。