Formation of a Substituted Tetrahydrofuran by Formal [2 + 2 + 1] Coupling of an Oxygen Atom with Two Olefins at a Nickel Center
作者:Kwangmo Koo、Gregory L. Hillhouse
DOI:10.1021/om980182u
日期:1998.6.1
Formation of the tetrasubstituted tetrahydrofuran exo-trans-endo-3-oxapentacyclo[9.2.1.1.5,80.2,1004,9]pentadeca-6,12-diene (5) has been accomplished by the coupling of an oxygen atom (from nitrous oxide) with two olefins (norbornadiene) at a Ni center. The reaction proceeds via a nickelacyclopentane complex (2) that is subsequently oxidized by N2O to give an isolable oxanickelacyclohexane (3). Oxidation
四取代四氢呋喃外-反-内-3-氧杂五环[9.2.1.1。]的形成。5,8 0. 2,10 0 4,9 ]十五烷基-6,12-二烯(5)是通过在Ni中心将一个氧原子(来自一氧化二氮)与两个烯烃(降冰片二烯)偶联而完成的。该反应通过镍环戊烷络合物(2)进行,随后被N 2 O氧化,得到可分离的氧杂环烷基环己烷(3)。用碘氧化3导致通过C,O还原消除形成5的C-O键(分离产率为47%)。