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
Facile One-Pot Synthesis of 1,3,5-Trisubstituted Pyrazoles from α,β-Enones
作者:Jin Yu、Ko Hoon Kim、Hye Ran Moon、Jae Nyoung Kim
DOI:10.5012/bkcs.2014.35.6.1692
日期:2014.6.20
efficient one-pot synthesis of 1,3,5-trisubstituted pyrazoles from α,β-enones and arylhydrazinehydrochlorides has been developed. The pyrazoles were formed via a tandem formation of the correspondingpyrazolines and an acid-catalyzed aerobic oxidation process.Key Words : Pyrazoles, One-pot synthesis, Aerobic oxidation, α,β-Enones Introduction1,3,5-Trisubstituted pyrazolines are important heterocycliccompounds