Palladium-Catalyzed [3 + 2] Annulation of Alkynes with Concomitant Aromatic Ring Expansion: A Concise Approach to (Pseudo)azulenes
作者:Fulin Zhou、Weiming Shi、Xingrong Liao、Yudong Yang、Zhi-Xiang Yu、Jingsong You
DOI:10.1021/acscatal.1c04549
日期:2022.1.7
in organic synthetic chemistry. Herein, we disclose a palladium-catalyzed [3 + 2] annulation technique of alkynes with concomitant aromatic ring expansion driven by a diboron reagent and iodide, affording a concise approach to azulenes (7-fused-5 bicycle) and pseudoazulenes (6-fused-5 bicycle). Compared with the documented synthetic strategies, the route to (pseudo)azulenes developed herein is applicable
The Photochemical Reaction of Diphenylacetylene with Enamines
作者:Norioki Miyamoto、Hitosi Nozaki
DOI:10.1246/bcsj.46.1257
日期:1973.4
and the enamine of the diethyl ketone (II) or of cyclopentanone (IV) gives two β,γ-unsaturated ketones, III and X respectively, in which the diphenylacetylene moiety is formally inserted into the respective enamine double bond under hydrogen migration. The reaction with the enamine of cyclohexanone (V) affords 2-(1,2-diphenylvinyl)cyclohexanone (XIII) as the major product in addition to the cycloadduct
二苯乙炔 (I) 和二乙酮 (II) 或环戊酮 (IV) 的烯胺的混合物的辐照分别得到两个 β,γ-不饱和酮,III 和 X,其中二苯乙炔部分正式插入到氢迁移下各自的烯胺双键。与环己酮 (V) 的烯胺反应得到 2-(1,2-二苯基乙烯基) 环己酮 (XIII) 作为除环加合物 (XV) 之外的主要产物。在每种情况下,都观察到 I 的光二聚体的形成。该反应通过加入芘猝灭,被苯并苯敏化,并且应该通过三线态路径进行。烯胺反应的不同路线可以通过考虑中间体双自由基的几何形状来解释。
The generation of azulene radical cations from arylalkynes
作者:Christopher J. Cooksey、John L. Courtneidge、Alwyn G. Davies、Jeffrey C. Evans、Peter S. Gregory、Christopher C. Rowlands
DOI:10.1039/c39860000549
日期:——
Arylalkynes ArCCR (R = alkyl or aryl) undergo one-electron oxidation with dimerization and rearrangement to show the e.s.r. spectra of the corresponding azuleneradicalcations.