Synthesis of C40-Symmetrical Fully Conjugated Carotenoids by Olefin Metathesis
作者:Noelia Fontán、Marta Domínguez、Rosana Álvarez、Ángel R. de Lera
DOI:10.1002/ejoc.201100935
日期:2011.11
In an effort to push olefinmetathesis to the limits of conjugation in reactants and products, the C40-symmetricalcarotenoids β,β-carotene (1), lycopene (2), (3R,3′R)-zeaxanthin (3), and rac-isozeaxanthin (4), which are conjugated undecaenes, have been synthesized from C21-terminal hexaenes by treatment with Grubbs' second-generation Ru catalyst in dichloromethane at 50 °C.