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
defect clusters facilitate 1O2 production for molecular oxygen activation in photocatalysis.
缺陷团簇促进光催化中分子氧活化产生活性氧的产生。
One-Pot Photomediated Giese Reaction/Friedel–Crafts Hydroxyalkylation/Oxidative Aromatization To Access Naphthalene Derivatives from Toluenes and Enones
γ-aryl ketones and naphthalenes, were conveniently synthesized from readily available toluenes and enones through the synergistic combination of photoredox and Lewis acid catalysis. The direct synthesis of γ-aryl ketones represents a rare example of Giese reactions between benzylic C(sp3)–H and enones that avoids the use of prefunctionalized metallic nucleophiles. Naphthalene derivatives were accessed
acetonitrile solution, the deprotonation of the ipso-arenium ions has not been observed and the main reaction was the 1–2 migration of the phenyl group. The reactivity of the ipso position in regard to attack by phenylcations and the reactivity of the 2 position are very similar. 1-methyl 4-phenyl naphthalene has not been detected by G L C so that demethylphenylation of 1,4-dimethylnaphthalene must
由四氟硼酸苯重氮鎓热解获得的苯基阳离子与DMSO中的1,4-二甲基萘反应生成1-甲基4-亚甲基1-苯基1,4-二氢萘以及2,5和6位的苯基化产物。前者的形成为C 6 H 5 +的进攻提供了直接的证据。ipso甲基。在纯的1,4-二甲基萘或乙腈溶液中,均未观察到ipso-areium离子的去质子化,主要反应是苯基的1-2迁移。关于被苯基阳离子侵蚀的ipso位的反应性和2位的反应性非常相似。GLC尚未检测到1-甲基4-苯基萘,因此1,4-二甲基萘的脱甲基苯基化作用必须忽略不计。
Apparent anomalous behavior of polar substituents on the benzene ring in the regioselectivity of di-π-methane rearrangement of 5,6-benzo-2-azabicyclo[2.2.2]octadienones
Polar substituenteffects on the aromatic ring emerge in the regioselectivity of the di-π-methanerearrangement of the title compounds when they possess the structural feature of including the bridgehead carbon in a saturated ring; the importance of the environment at the bridgehead carbon is pointed out.