Four-component Pd-catalysed cascade/ring closing metathesis. Synthesis of heterocyclic enones
作者:Ronald Grigg、William Martin、James Morris、Visuvanathar Sridharan
DOI:10.1016/j.tet.2005.09.015
日期:2005.11
palladium-catalysed four-component process is described involving carbon monoxide, allene and aryl/heteroaryl iodides generating (π-allyl) palladium species, which are intercepted by alkene tethered nitrogen nucleophiles to afford 1,6- and 1,7-dienones. Subsequent ring closing metathesis affords five- and six-membered N-heterocyclic enones. The N-heterocyclic enones are active dipolarophiles in 1,3-dipolar
描述了一种钯催化的四组分方法,该方法涉及一氧化碳,丙二烯和芳基/杂芳基碘化物,生成(π-烯丙基)钯,并被烯烃系氮亲核试剂拦截,得到1,6-和1,7-二壬烯。随后的闭环复分解得到五元和六元的N-杂环烯酮。的Ñ -杂环烯酮是例证由偶氮甲碱内鎓盐和硝酮环加成在1,3-偶极环加成反应活性dipolarophiles。