Determining the Scope of the Organolanthanide-Catalyzed, Sequential Intramolecular Amination/Cyclization Reaction:  Formation of Substituted Quinolizidines, Indolizidines, and Pyrrolizidines

2003 ◽  
Vol 68 (24) ◽  
pp. 9214-9220 ◽  
Author(s):  
Gary A. Molander ◽  
Shawn K. Pack
Keyword(s):  
Cyclization Reaction ◽  
Reaction Formation

scholarly journals Restriction of the conrotatory motion in photo-induced 6π electrocyclic reaction: formation of the excited state of the closed-ring isomer in the cyclization

RSC Advances ◽  
2020 ◽  
Vol 10 (34) ◽  
pp. 20038-20045
Author(s):  
Tatsuhiro Nagasaka ◽  
Hikaru Sotome ◽  
Soichiro Morikawa ◽  
Lucas Martinez Uriarte ◽  
Michel Sliwa ◽  
...  
Keyword(s):  
Excited State ◽  
Molecular Geometry ◽  
Cyclization Reaction ◽  
Closed Ring ◽  
Electrocyclic Reaction ◽  
Reaction Formation

Restriction of the molecular geometry opens up a novel pathway in the cyclization reaction of a photochromic dithiazolylarylene derivative.

Synthesis of Novel Bis-pyrazoles via Electrophilic Cyclization

2019 ◽  
Vol 16 (6) ◽  
pp. 511-516
Author(s):  
Adnan Cetin
Keyword(s):  
13C Nmr ◽  
Cyclization Reaction ◽  
Electrophilic Cyclization ◽  
Pyrazole Derivatives ◽  
Spectral Analyses ◽  
Mass Spectral ◽  
Palladium Catalyzed ◽  
Ft Ir ◽  
Reaction Compound

Efficient steps towards the synthesis of novel (phenyl)(1'-aryl-1,5,5'-triphenyl[3,3'-bi-1Hpyrazol]- 4-yl)methanones 4a-e were developed. The procedure starts from 1-(4-benzoyl-1,5-diphenyl- 1H-3-pyrazolyl)-3-phenyl-2-propyn-1-one (2) which was synthesized by a palladium catalyzed crosscoupling reaction. Compound 2 reacted with various hydrazines to give (E)-(phenyl)[1,5-diphenyl-3- [3-phenyl-1-(2-arylhydrazono)-2-propyn-1-yl]-1H-4-pyrazolyl]methanones E-3a-e. The bis-pyrazole derivatives 4a-e were synthesized from electrophilic cyclization reaction of α,β-acetylenic hydrazones E-3a-e and copper(I) iodide. All synthesized compounds were characterized by FT-IR, 1H, 13C NMR and Mass spectral analyses.

Quaternary Carbon Center Forming [3 + 2] Cyclization Reaction by Adjusting the Substituents of Substrates

2019 ◽  
Vol 84 (21) ◽  
pp. 13871-13880 ◽  
Author(s):  
Xie-Chao Yang ◽  
Jin-Yu Liu ◽  
Zhen Liu ◽  
Xiu-Qin Hu ◽  
Peng-Fei Xu
Keyword(s):  
Cyclization Reaction ◽  
Quaternary Carbon

The unique substitution-cyclization reaction cascade inspired highly selective H2Sn probe development

2020 ◽  
Vol 304 ◽  
pp. 127382 ◽  
Author(s):  
Li Fu ◽  
Chunfei Chen ◽  
Wenqiang Chen ◽  
Jun Huang ◽  
Junan Xiao ◽  
...  
Keyword(s):  
Cyclization Reaction

New Stereoselective Entry to Azaspirocyclic Nucleus of Halichlorine and Pinnaic Acids by Radical Translocation/Cyclization Reaction

2003 ◽  
Vol 5 (17) ◽  
pp. 3017-3020 ◽  
Author(s):  
Kiyosei Takasu ◽  
Hiroshi Ohsato ◽  
Masataka Ihara
Keyword(s):  
Cyclization Reaction

Regioselective Synthesis of 2,3‐Dihydrobenzo[ f ]isoindolones via Ag‐Catalyzed Sequential Ugi 4CR/Cascade Radical Cyclization Reaction

2021 ◽  
Vol 363 (4) ◽  
pp. 1038-1043
Author(s):  
Ying‐Chun He ◽  
Yan‐Mei Yan ◽  
Zhen‐Xing Ren ◽  
Yong‐Zhao Wang ◽  
Qiang Yu ◽  
...  
Keyword(s):  
Radical Cyclization ◽  
Cyclization Reaction ◽  
Regioselective Synthesis
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