An electroreductive 4-pyridylation of activated alkenes was developed in an undivided cell with the assistance of Ni(acac)(2) (acac = acetylacetone). This novel protocol is compatible with a broad range of electron-poor alkenes, which are commonly regarded as challenging substrates in the previous conventional approaches. Moreover, a series of cyclic voltammetric experiments were conducted to reveal the unique role of Ni(acac)(2) differentiating reduction process of reaction partners.
Conjugate Addition of 2- and 4-Pyridylcuprates: An Expeditious Asymmetric Synthesis of Natural (−)-Evoninic Acid
作者:Alan C. Spivey、Lena Shukla、Judy F. Hayler
DOI:10.1021/ol070011y
日期:2007.3.1
of 2-bromo-3-methylpyridine to (E)-methyl crotonate then diastereoselective enolate alkylation and lipase-mediated enantioselective ester hydrolysis have enabled an efficient four-step first asymmetricsynthesis of the Celastraceae sesquiterpenoid esterifying ligand (-)-(1'S,2'S)-evoninic acid.