AbstractCopper(II) acetylacetonate‐catalyzed Wittig olefination reactions of aldehydes with ketone‐derived N‐tosylhydrazones are reported. A series of tosylhydrazones was investigated and our results showed that the carbon number of the alkyl chain influences the E‐selecivity of the alkenes greatly. Alkenes could be obtained in moderate yields and excellent E‐selectivity when the carbon numbers were up to two. Under metal‐free conditions, triphenylphosphine was able to capture the in situ generated diazo compounds and the corresponding unsymmetrical azines were formed in good yields.magnified image
Capture of<i>In Situ</i>Generated Diazo Compounds or Copper Carbenoids by Triphenylphosphine: Selective Synthesis of<i>trans</i>- Alkenes and Unsymmetric Azines<i>via</i>Reaction of Aldehydes with Ketone-Derived<i>N</i>-Tosylhydrazones
作者:Qiang Sha、Yifei Ling、Wenyong Wang、Yunyang Wei
DOI:10.1002/adsc.201300302
日期:2013.8.12
AbstractCopper(II) acetylacetonate‐catalyzed Wittig olefination reactions of aldehydes with ketone‐derived N‐tosylhydrazones are reported. A series of tosylhydrazones was investigated and our results showed that the carbon number of the alkyl chain influences the E‐selecivity of the alkenes greatly. Alkenes could be obtained in moderate yields and excellent E‐selectivity when the carbon numbers were up to two. Under metal‐free conditions, triphenylphosphine was able to capture the in situ generated diazo compounds and the corresponding unsymmetrical azines were formed in good yields.magnified image