Results 141 to 150 of about 4,972 (216)

o-Nitrobenzyl Oxime Ethers Enable Photoinduced Cyclization Reaction to Provide Phenanthridines under Aqueous Conditions.

Organic Letters, 2023
In this paper, we describe a novel N-O photolysis of o-nitrobenzyl oxime ethers that enables the synthesis of phenanthridines via intramolecular cyclization reactions. Without the use of additional photocatalysts or photosensitizers, the process proceeds
Hidenori Okamura, Momoka Iida, Yui Kaneyama, F. Nagatsugi   +3 more
semanticscholar   +1 more source

Regioselective Synthesis of Phenanthridines via Pd(II)-Catalyzed Annulative C(sp2)-H Activation.

Journal of Organic Chemistry, 2023
A robust synthesis of phenanthridines has been described via Pd(II)-catalyzed domino C(sp2)-H activation/N-arylation using oxime esters with aryl acyl peroxides in a highly regioselective manner.
Anamika Yadav, Surabhi Upadhyay, R. Kant, Ajay Kumar Srivastava   +3 more
semanticscholar   +1 more source

NHC-Catalyzed Tandem Reaction: A Strategy for the Synthesis of 2-Pyrrolidinone-Functionalized Phenanthridines.

Journal of Organic Chemistry, 2023
Herein, an N-heterocyclic carbene (NHC)-catalyzed tandem cyclization/addition/cyclization reaction of 2-isocyanobiaryls and α-bromo-N-cinnamylamides for the synthesis of 2-pyrrolidinone-functionalized phenanthridines is developed.
N. Zhou, Lei Wang, Fangli Zhao, Xiangyu Gao, Xiaowei Zhao, Man Zhang   +5 more
semanticscholar   +1 more source

Photochemical Synthesis of Succinic Ester-Containing Phenanthridines from Diazo Compounds as 1,4-Dicarbonyl Precursors.

Organic Letters, 2022
We disclosed herein a straightforward photochemical method for the construction of phenanthridines containing a synthetically useful succinate unit. The reaction occurred under visible-light irradiation with cheap eosin Y Na as photoredox catalyst and a ...
Haiwei Ye, Xu Zhou, Lei Li, Xiang‐Kui He, Jun Xuan   +4 more
semanticscholar   +1 more source

Metal-Free Generation of γ-Cyanoalkyl Radicals by N-Heterocyclic Carbene Catalysis: Assembly of 6-Cyanoalkyl Phenanthridines.

Organic Letters, 2022
A number of γ-cyanoalkyl radicals were generated by sustainable N-heterocyclic carbene catalysis in tin-, transition-meal-, and light-free conditions, followed by insertion into biaryl isonitriles, thus leading to the rapid assembly of a variety of ...
Qianrong Li, Cong‐Ying Zhou, Chengming Wang   +2 more
semanticscholar   +1 more source

Redox-Neutral Generation of Iminyl Radicals by N-Heterocyclic Carbene Catalysis: Rapid Access to Phenanthridines from Vinyl Azides.

Organic Letters, 2022
An N-heterocyclic carbene-catalyzed oxidant-, metal- and light-free iminyl radical generation pathway stemming from the reaction of vinyl azide and α-bromo ester is uncovered.
Lixia Liu, Qijing Zhang, Chengming Wang
semanticscholar   +1 more source

Redetermination of the structure of phenanthridine [PDF]

Acta Crystallographica Section C Crystal Structure Communications, 1993
C 13 H 9 N, M r =179.22, orthorhombic, P2 1 2 1 2 1 , a=4.872 (2), b=11.526 (4), c= 15.811 (4) A, V=887.7 (5) A 3 , Z=4, D x = 1.341 Mg m -3 , λ(Mo Kα)=0.71069 A, μ= 0.07 mm -1 , F(000)=376, T=110 K, final R=0.045 for 1713 observed reflections. Phenanthridine was found to be planar in the solid state with a mean deviation of 0.002 A from the mean plane
Brett, W.a., Rademacher, Paul, Boese, Roland   +2 more
openaire   +1 more source

Visible Light-Promoted Radical-Mediated Ring-Opening/Cyclization of Vinyl Benzotriazoles: An Alternative Approach to Phenanthridines.

Organic Letters, 2022
A visible light-promoted radical-mediated ring-opening/cyclization of vinyl benzotriazoles has been developed. The method provides an efficient and practical approach to synthesize functionalized phenanthridines from vinyl benzotriazoles with alkyl ...
Jiaqi Li, Shichong Wang, Jingjing Zhao, Pan Li   +3 more
semanticscholar   +1 more source

Synthesis of C8-Aminated Pyrrolo-Phenanthridines or -Indoles via Series C(sp2 or sp3)-H Activation and Fluorescence Study.

Organic Letters, 2022
This report developed a method for the synthesis of C8-aminated pyrrolo-phenanthridines or -indoles by series ortho C(sp2)-H amination/ipso C(sp2)-H or C(sp3)-H arylation.
Bo-Sheng Zhang, Wan-Yuan Jia, Xue-Ya Gou, Ying-Hui Yang, Fan Wang, Yi-Ming Wang, Xi‐Cun Wang, Zhengjun Quan   +7 more
semanticscholar   +1 more source

Bischler-Napieralski Synthesis of 6-Alkynyl Phenanthridines Based on Tf2O-Promoted Electrophilic Activation of N-Aryl-2-propynamides.

Journal of Organic Chemistry, 2021
An efficient method for the synthesis of 6-alkynyl phenanthridines was developed. The method offered the first example to use 2-propynamides as substrates in the Bischler-Napieralski reaction and to create alkynylnitrilium triflates as new active ...
L. Shan, Hongchen Li, L. Min, Yunxiang Weng, Xinyan Wang, Yuefei Hu   +5 more
semanticscholar   +1 more source