Preparation of N-Heterocycles by Radical Cyclisation of Enamides Mediated by Manganese(III) or Copper(I). A Comparison of Cyclisation Methods
作者:David T Davies、Neha Kapur、Andrew F Parsons
DOI:10.1016/s0040-4020(00)00316-1
日期:2000.6
Reaction of enamides with manganese(III) acetate or copper(I) chloride/bipyridine has been investigated. In both cases, an initial 5-endo-trig radical cyclisation reaction took place to produce functionalised pyrrolidinones. The copper(I)-mediated cyclisations were very efficient and bicyclic dienes could be isolated in >80% yield, while the corresponding manganese(III) reactions were generally more problematic
研究了酰胺与乙酸锰(III)或氯化铜(I)/联吡啶的反应。在两种情况下,初始5-内切- trig的自由基环化反应发生来产生官能化的吡咯烷酮。铜(I)介导的环化非常有效,双环二烯的收率> 80%,而相应的锰(III)反应通常存在更多问题,相关的二烯收率较低(35-52%)。