An Assembly of Pyrano[3,2‐b]indol‐2‐ones via NHC‐Catalyzed [3 + 3] Annulation of Indolin‐3‐ones with Ynals†
作者:Xia Wang、Shulei Zhang、Shao‐Jie Wang、Hao An、Xiaolan Xin、Haonan Lin、Zhifeng Tu、Shenci Lu
DOI:10.1002/cjoc.202300728
日期:2024.7
We report herein an unprecedented N-heterocycliccarbene-catalyzed formal [3 + 3] annulation of ynals with N-Ts indolin-3-ones under the oxidation condition affording the functionalized pyrano[3,2-b]indol-2-ones. The alkynyl acylazoliums via the combination of a carbene with ynals in the presence of oxidate proved to be the important intermediates for the success of this transformation. This method
The Reaction of Iodine Monochloride with Polycyclic Aromatic Compounds: Polar and Electron Transfer Pathways
作者:Dean E. Turner、Robert F. O'Malley、Dennis J. Sardella、Lucio S. Barinelli、Pushkar Kaul
DOI:10.1021/jo00103a026
日期:1994.12
Several polycyclic aromatic hydrocarbons were treated with iodine monochloride. Although iodination is the predominant reaction of benzenoid arenes, chlorination is the sole reaction with anthracene, phenanthrene and naphthalene compounds (except for 5), whose oxidation half-wave potentials are less than 1.58 V vs Ag/Ag+ (0.1 M). Arenes with higher potentials are unreactive. Naphthalene (9) and its derivatives with mild electron-withdrawing substituents are chlorinated; the exception (5) yields the 1-iodo product (21). The reaction is first order in substrate and second order in ICl. An electron transfer pathway involving radical cation intermediates is assumed. Ion-pair collapse of the radical cation-ICl intermediates is proposed for the chlorinations and radical-pair collapse for the iodination.