Regioselectivity in the 1,3-dipolar cycloaddition of nitrile oxides to alkylidenecyclopropanes.
作者:Alberto Brandi、Silvio Carli、Antonio Guarna、Francesco De Sarlo
DOI:10.1016/s0040-4039(00)96402-5
日期:1987.1
The 1,3-dipolar cycloaddition of nitrile oxides to methylenecyclopropanes substituted on the exocyclic double bond gives prevalently or exclusively 4-spirocyclopropane isoxazolines when the substituent is arylic or alkylic group, 5-spirocyclopropane isoxazolines when the substituent is an electron-withdrawing group. Adducts 16 and 17 selectively rearrange photochemically to the enaminoenone 19.
当取代基为芳基或烷基时,腈氧化物与在环外双键上取代的亚甲基环丙烷的1,3-偶极环加成可普遍或仅形成4-螺环丙烷异恶唑啉,而当取代基为吸电子基团时则产生5-螺环丙烷异恶唑啉。加合物16和17选择性地光化学重排至烯胺酮19。