Medium and substituent effects on the photochemistry of phenanthridine N-oxides. Is an intermediate of diradical character involved in the photorearrangement of heterocyclic N-oxides?
作者:Angelo Albini、Elisa Fasani、Valeria Frattini
DOI:10.1039/p29880000235
日期:——
The photochemistry of several 6-substituted phenanthridine N-oxides has been investigated, or reinvestigated, in benzene and ethanol. The main processes observed are: (a) 1,2-oxygen and substituent shift to yield N-substituted phenanthridones (2) and (b) ring enlargements to dibenzo[d,f]-1,3-oxazepines (7). With 6-diphenylmethylphenanthridine N-oxide (1b) rearrangement (a) predominates and occurs with
Bronsted acid-mediated reactions of aldehydes with 2-vinylaniline and biphenyl-2-amine
作者:Xu Zhang、Xuefeng Xu、Lintao Yu、Qiang Zhao
DOI:10.1016/j.tetlet.2014.02.090
日期:2014.4
Herein we report simple Bronsted acid-mediated reactions of aldehydes with 2-vinylaniline and biphenyl-2-amine. Ultimately, the useful nitrogen-containing heterocycle derivatives are obtained. The electronic properties of the substituents on the aldehydes and 2-vinylaniline were investigated. It was found that molecules with both electron-donating and -withdrawing substituents were perfectly suitable
Cascade Approach to Substituted 6-Aryl-phenanthridines from Aromatic Aldehydes, Anilines, and Benzenediazonium-2-carboxylate
作者:Wang-Ge Shou、Yun-Yun Yang、Yan-Guang Wang
DOI:10.1021/jo061648i
日期:2006.11.1
Aromatic aldehydes reacted with anilines and benzenediazonium-2-carboxylate to afford 6-aryl-phenanthridines. The reaction furnishes a rapid and direct construction of substituted phenanthridine rings from readily available starting materials via a one-pot cascade process.
Pd/Fe<sub>3</sub>O<sub>4</sub> supported on nitrogen-doped reduced graphene oxide for room-temperature isocyanide insertion reactions
作者:Karandeep Singh、Ajay K. Singh、Devendra Singh、Rakhi Singh、Siddharth Sharma
DOI:10.1039/c5cy01973g
日期:——
graphene oxide (N-rGO) catalyst was developed to carry out the synthesis of quinazolinones and phenanthridines under extremely mild conditions through isocyanideinsertion cascades. The supported Pd/Fe3O4 nanoparticles could be easily recovered from the reaction mixture and reused several times without any loss in catalytic activity.
开发了一种多功能的Pd / Fe 3 O 4负载在N掺杂的还原氧化石墨烯(N-rGO)催化剂上,以在极温和的条件下通过异氰酸酯插入级联反应进行喹唑啉酮和菲啶的合成。负载的Pd / Fe 3 O 4纳米颗粒可以很容易地从反应混合物中回收并重复使用数次,而不会降低催化活性。
Palladium and radical routes to phenanthridines
作者:W. Russell Bowman、Jessica E. Lyon、Gareth J. Pritchard
DOI:10.3998/ark.5550190.0013.714
日期:——
Two routes to phenanthridines are reported; a palladium-mediated route using imidoyl-selanides as precursors and a modified radicalroute using aryl imines as starting materials.