iminyl‐radical formation has been established for the construction of pyridines, quinolines, and phenanthridines from acyl oximes. With fac‐[Ir(ppy)3] as a photoredox catalyst, the acyl oximes were converted by 1 e− reduction into iminyl radical intermediates, which then underwent intramolecular homolytic aromatic substitution (HAS) to give the N‐containing arenes. These reactions proceeded with a broad
已经建立了涉及可见光诱导的亚胺基自由基形成的统一策略,用于从酰基肟中构建吡啶,喹啉和菲啶。用FAC - [的Ir(ppy)3 ]作为催化剂photoredox,酰基肟通过1e中转化-还原成亚氨基自由基中间体,然后行分子内均裂芳族取代(HAS),得到含有N-芳烃其中。这些反应在室温下以宽范围的底物以高收率进行。这种可见光诱导的亚胺基自由基形成策略已成功地应用于五步精简合成苯并[ c ]菲啶生物碱。
Palladium-Catalyzed Domino Direct Arylation/N-Arylation: Convenient Synthesis of Phenanthridines
作者:David A. Candito、Mark Lautens
DOI:10.1002/anie.200902400
日期:2009.8.24
Domino reactions possess the ability to generate complexity from simple starting materials. Disclosed is a strategy for the dominodirectarylation/N‐arylation for the facile construction of diverse phenanthridine derivatives (see scheme; TMS=trimethylsilyl, TBDMS=tert‐butyldimethylsilyl).
Visible-Light-Promoted and One-Pot Synthesis of Phenanthridines and Quinolines from Aldehydes and <i>O</i>-Acyl Hydroxylamine
作者:Xiao-De An、Shouyun Yu
DOI:10.1021/acs.orglett.5b01096
日期:2015.6.5
A one-pot synthesis of phenanthridines and quinolines from commercially available or easily prepared aldehydes has been reported. O-(4-Cyanobenzoyl)hydroxylamine was utilized as the nitrogen source to generate O-acyl oximes in situ with aldehydes catalyzed by Bronsted acid. O-Acyl oximes were then subjected to visible light photoredox catalyzed cyclization via iminyl radicals to furnish aza-arenes. A variety of phenanthridines and quinolines have been prepared assisted by Bronsted acid and photocatalyst under visible light at room temperature with satisfactory yields.
Synthesis of Phenanthridine Derivatives via Photolysis
作者:Anna M. Linsenmeier、Craig M. Williams、Stefan Bräse
DOI:10.1021/jo201542x
日期:2011.11.4
An improved photochemical method for producing the prolifically bioactive phenanthridine system is reported. A wide variety of derivatives were obtained in two steps in yields ranging from 31 to 95%.
Electron-Transfer-Mediated Synthesis of Phenanthridines by Intramolecular Arylation of Anions from <i>N</i>-(<i>ortho</i>-Halobenzyl)arylamines: Regiochemical and Mechanistic Analysis
作者:María E. Budén、Viviana B. Dorn、Martina Gamba、Adriana B. Pierini、Roberto A. Rossi
DOI:10.1021/jo9025918
日期:2010.4.2
The synthesis of a series of substituted phenanthridines by photostimulated C-C cyclization of anions from N-(ortho-halobenzyl)arylamines has been found to proceed in very good to excellent yields (79-95%) in liquid ammonia and in DMSO. The N-(ortho-halobenzyl)arylamines are obtained in good to very good isolated yields (44-85%) by nucleophilic substitution of ortho-halobenzylchlorides with different arylamines. The reaction of the anions of a diverse set of N-(ortho-halobenzyl)arylamines was studied, and the methodology was extended to the synthesis of tri-spheridine, a natural product, in very good yield. In order to explain the regiochemical outcome or these reactions, a theoretical analysis was performed with DFT methods and the B3LYP functional.