A Visible-Light-Mediated Oxidative CN Bond Formation/Aromatization Cascade: Photocatalytic Preparation of N-Arylindoles
作者:Soumitra Maity、Nan Zheng
DOI:10.1002/anie.201205137
日期:2012.9.17
Just add light and air: Structurally diverse N‐arylindoles can be prepared from readily prepared o‐styryl anilines through visible‐light photocatalysis. The reaction, which is conducted open to air, is mediated by [Ru(bpz)3](PF6)2 (bpz=2,2′‐bipyrazine) and involves both CNbondformation and aromatization (see scheme). Using suitably substituted substrates, a 1,2‐carbon shift can be also incorporated
只需添加光和空气:可以通过可见光光催化从容易制备的邻苯乙烯基苯胺制备结构多样的N-芳基吲哚。该反应在空气中进行,由 [Ru(bpz) 3 ](PF 6 ) 2 (bpz=2,2′-联吡嗪)介导,涉及 C N 键形成和芳构化(见方案)。使用适当取代的底物,1,2-碳转移也可以纳入该级联反应中。
Facile Generation of a Strained Cyclic Vinyl Cation by Thermal Solvolysis of Cyclopent-1-enyl-λ<sup>3</sup>-bromanes
作者:Kazunori Miyamoto、Motoo Shiro、Masahito Ochiai
DOI:10.1002/anie.200903368
日期:2009.11.9
Last of the cyclic vinyl cations: The simple solvolysis of cyclopent‐1‐enyl‐λ3‐bromane efficiently generates the highly strained cyclopent‐1‐enyl cation at room temperature (see scheme). The very high nucleofugality of the aryl‐λ3‐bromanyl groups are responsible for this unique unimolecular dissociation.
Oxygenated phenanthrenes via quinol ketals: Cyclization vs. migration
作者:Gary W. Morrow、Tina M. Marks、Debra L. Sear
DOI:10.1016/0040-4020(95)00593-w
日期:1995.9
2-methoxyphenanthrenes were prepared by reaction of lithiated 2-bromostyrenes with quinone monoketals followed by acid-mediated cyclization of the resulting p-arylquinol ketals. Substitution at the bromostyrene side-chain or the quinone monoketal ring had only a modest effect on yields, but oxygen substitution on the bromostyrene aromatic nucleus resulted in a competing 1,2-aryl migration arising during the quinol ketal cyclization step. The extent of this rearrangement was found to be a function of the Lewis acid/solvent system employed.
Palladium-Catalyzed Alkenyl C–H Activation/Diamination toward Tetrahydrocarbazole and Analogs Using Hydroxylamines as Single-Nitrogen Sources
作者:Lingbo Han、Tingjie Liu、Han Wang、Xinjun Luan
DOI:10.1021/acs.orglett.2c03809
日期:2023.1.13
CYCLOALIPHATISCH-AROMATISCHE DIPHOSPHINE UND IHRE VERWENDUNG IN DER KATALYSE