Results 151 to 160 of about 4,972 (216)

A Photochemical Intramolecular C-N Coupling Toward the Synthesis of Benzimidazole-Fused Phenanthridines.

Journal of Organic Chemistry, 2021
Herein, we report a direct photochemical dehydrogenative C-N coupling of unactivated C(sp2)-H and N(sp2)-H bonds. The catalysts or additive-free transformation of 2-([1,1'-biphenyl]-2-yl)-1H-benzo[d]imidazole to benzo[4,5]imidazo[1,2-f]phenanthridine was
S. K. Bera, P. J. Boruah, Shraddha Saraswati Parida, A. Paul, Prasenjit Mal   +4 more
semanticscholar   +1 more source

Visible-light-driven Difluoromethylation of Isocyanides with S-(Difluoromethyl)diarylsulfonium Salt: Access to a Wide Variety of Difluoromethylated Phenanthridines and Isoquinolines.

Journal of Organic Chemistry, 2020
A highly efficient approach of visible-light-driven radical difluoromethylation of isocyanides to access a wide variety of difluoromethylated phenanthridines and isoquinolines was herein described.
Wenbing Qin, Wei Xiong, Xin Li, Jiayi Chen, Li-Ting Lin, H. Wong, Guokai Liu   +6 more
semanticscholar   +1 more source

Synthesis of Phenanthridines through Iodine-Supported Intramolecular C-H Amination and Oxidation under Visible Light.

Journal of Organic Chemistry, 2020
Herein, we report a metal-free and step-economic synthesis of phenanthridines from 2-biarylmethanamines under mild conditions. The reaction involves in an iodine-supported intramolecular C-H amination and oxidation of 5,6-dihydrophenanthridine under air ...
Yan-Li Gao, Yi Jing, Lixin Li, Jie Zhang, Xuenian Chen, Yan-Na Ma   +5 more
semanticscholar   +1 more source

ChemInform Abstract: Synthesis of Pyrrolo[a]‐ and Pyrrolo[c]phenanthridine Derivatives and Indolinyl and Indolyl‐Substituted 6‐Phenanthridines. [PDF]

ChemInform, 2001
AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
M. E. Zhukova, N. N. Suvorov, V. E. Zhigachev, V. N. Buyanov, Andrey E. Shchekotikhin, E. P. Baberkina   +5 more
openaire   +2 more sources

Additive-Free Radical Cascade Reaction of Oxime Esters：Synthesis of Pyrroline-Functionalized Phenanthridines.

Journal of Organic Chemistry, 2020
A variety of dihydropyrrole-functionalized phenanthridines were efficiently synthesized by the metal-free, radical cascade cyclization reaction of 2-isocyanobiphenyls with γ, δ-unsaturated oxime esters.
Yijie Xue, D. Xue, Qian He, Qianwei Ge, Wei Li, Liming Shao   +5 more
semanticscholar   +1 more source

Spiropyrans of the phenanthridine series

Chemistry of Heterocyclic Compounds, 1974
The relative stabilities of the cyclic and open forms of spiropyrans of the phenanthridine series depend on the character and position of the substituents in the chromene ring and also on the polarity of the media. The structure of the open forms of the spiropyrans is closer to the limiting dipolar structure.
É. R. Zakhs, L. S. Efros, V. P. Martynova   +2 more
openaire   +2 more sources

TBPB-initiated cascade cyclization of 3-arylethynyl-[1,1'-biphenyl]-2-carbonitriles with sulfinic acids: access to sulfone-containing cyclopenta[gh]phenanthridines.

Organic and biomolecular chemistry, 2020
A novel TBPB-initiated cascade cyclization of 3-arylethynyl-[1,1'-biphenyl]-2-carbonitriles with sulfinic acids via C-S, C-C and C-N bond formation for the synthesis of 3-sulfonated cyclopenta[gh]phenanthridines under metal-free conditions has been ...
N. Zhou, Meixia Wu, Man Zhang, Xiaoqiang Zhou, Wei Zhou   +4 more
semanticscholar   +1 more source

Synthesis of phenanthridines by I2-mediated sp3 C-H amination.

Organic and biomolecular chemistry, 2020
An I2-mediated synthesis of phenanthridines via intramolecular sp3 C-H amination of readily accessible aniline precursors is reported. The present synthetic process is straightforward and applicable to a broad variety of unprotected aniline substrates ...
B. Fang, Jiao Hou, Jin-Yue Tian, Wenquan Yu, Junbiao Chang   +4 more
semanticscholar   +1 more source

Thiophene Analogus of Phenanthridine

Synthetic Communications, 1972
Abstract We reported reoently1 that the dithienpyridones I-III could be prepared by the cyclisation of the appropriate dithienylazides.
G. J. Heeres, Hans Wynkrg
openaire   +2 more sources

Thermal vs. Visible‐Light Photoredox‐Catalyzed Cascade Radical Cyclization Involving SO2 Fixation to Access 6‐Alkylsulfonylmethyl Phenanthridines

Asian Journal of Organic Chemistry
Convenient access to 6‐alkylsulfonylmethyl phenanthridines has been demonstrated both under non‐catalytic thermal and visible‐light photoredox‐catalyzed conditions. A cascade of radical cyclization is triggered by the exposure of biphenyl vinyl azides to
T. K. Sahu, Abhaykumar Vishwakarma, Vidyanshu Kumar, Rahimuddin Khan, Tabrez Khan   +4 more
semanticscholar   +1 more source