Electrochemical [4+2] Annulation‐Rearrangement‐Aromatization of Styrenes: Synthesis of Naphthalene Derivatives
作者:Yueyue Ma、Jufeng Lv、Chengyu Liu、Xiantong Yao、Guoming Yan、Wei Yu、Jinxing Ye
DOI:10.1002/anie.201902315
日期:2019.5.13
We report the first electrochemical strategy to synthesize functionalized naphthalene derivatives through [4+2] annulation—rearrangement–aromatization from styrenes under mild conditions. The electrolysis does not require metals, oxidants and high valence substrates, indicating the atom and step‐economy ideals. The dehydrodimer produced through [4+2] cycloaddition of 4‐methoxy α‐methyl styrene is isolated
Unwringing the ring: Methylenecyclopropanes reacted with vinyl and aryl Grignard reagents in the presence of a nickel catalyst to afford vinyl‐ and arylmagnesation products, respectively, through a selective CC bondcleavage (see scheme). The reaction provides a new method for the preparation of substituted homoallyl and allyl Grignard reagents.