Ring-Closing Metathesis of Vinyl Fluorides towards α-Fluorinated α,β-Unsaturated Lactams and Lactones
作者:Michael Marhold、Christian Stillig、Roland Fröhlich、Günter Haufe
DOI:10.1002/ejoc.201402535
日期:2014.9
corresponding ϵ-lactam was also formed in 38 % yield. When N-(2-fluoroallyl) derivatives were used instead of fluoroacryloyl derivatives, six-, seven-, and eight-membered N-heterocycles were obtained in low yields. This method was also used to synthesize fluorinated α,β-unsaturated analogues of pyrrolizidine and indolizidine alkaloids from prolinol, and also to synthesize N-benzyl-3-fluoroquinolone in
使用 Grubbs II 或 Hoveyda 催化剂的闭环烯烃复分解反应 (RCM) 已应用于一系列 N-烯基-N-苄基-α-氟丙烯酰胺。α-氟代-α,β-不饱和γ-或δ-内酰胺结合了氟化双键,收率中等至良好,这取决于苄基环上取代基的性质。在类似条件下未形成相应的七元和八元内酰胺。当 N-苄基被 N-甲苯磺酰基取代时,相应的 ϵ-内酰胺也以 38% 的产率形成。当使用 N-(2-氟烯丙基) 衍生物代替氟丙烯酰基衍生物时,以低产率获得六元、七元和八元 N-杂环。该方法还用于从脯氨醇合成吡咯里西啶和吲哚里西啶生物碱的氟化α,β-不饱和类似物,并且还从市售的 2-乙烯基苯胺中分三步合成 N-苄基-3-氟喹诺酮,总产率为 44%。3-氟香豆素和3-氟色烯由邻乙烯基苯酚制备,3-氟-苯并氧杂则由邻烯丙基苯酚制备。