scholarly journals Copper-Catalyzed the Synthesis of 3-Trifluoromethylchromone via Trifluoromethyl Radical Addition Tandem Cyclization Reaction of 2-Hydroxyphenyl Enaminones

2021 ◽  
Vol 41 (8) ◽  
pp. 3242
Author(s):  
Keying Du ◽  
Zhanming Zhang ◽  
Weijian Sheng
Keyword(s):  
Radical Addition ◽  
Cyclization Reaction ◽  
Tandem Cyclization

Photocatalytic xanthate-based radical addition/cyclization reaction sequence toward 2-biphenyl isocyanides: synthesis of 6-alkylated phenanthridines

2020 ◽  
Vol 18 (18) ◽  
pp. 3487-3491 ◽  
Author(s):  
Pedro López-Mendoza ◽  
Luis D. Miranda
Keyword(s):  
Radical Addition ◽  
Cyclization Reaction ◽  
Modular Approach ◽  
Reaction Sequence

A photocatalytic xanthate-based radical addition/cyclization reaction cascade toward 2-biphenylisocyanides is described as a practical and modular approach to 6-alkylated phenanthridines.

Synthesis of 4-styrylcoumarins via FeCl3-promoted cascade reactions of propargylamines with β-keto esters

2019 ◽  
Vol 17 (16) ◽  
pp. 4005-4013 ◽  
Author(s):  
Li-Qin Yan ◽  
Xiaoting Cai ◽  
Xinwei He ◽  
Hui Wang ◽  
Mengqing Xie ◽  
...  
Keyword(s):  
Cascade Reactions ◽  
Cyclization Reaction ◽  
Quinone Methides ◽  
Keto Esters ◽  
Tandem Cyclization

A versatile and highly regioselective FeCl3-promoted tandem cyclization reaction of in situ generated alkynyl o-quinone methides (o-AQMs) with β-keto esters has been developed.

Palladium(II)-Catalyzed Three-Component Tandem Cyclization Reaction for the One-Pot Assembly of 4-Arylquinazolines

Synthesis ◽  
2020 ◽  
Author(s):  
Guolin Zhang ◽  
Yongping Yu ◽  
Zijuan Wang ◽  
Wenteng Chen ◽  
Chang He
Keyword(s):  
Bond Formation ◽  
Cascade Reaction ◽  
Cyclization Reaction ◽  
One Pot ◽  
Tandem Cyclization ◽  
The One

AbstractA one-pot method for joining three separate components leading to an assortment of 4-arylquinazolines (27 examples) in good to excellent yields is described. The method consists of a palladium(II)-catalyzed­ cascade reaction involving C(sp)–C(sp2) coupling followed by intramolecular C–N bond formation. The reaction was readily scaled up to gram quantity and successfully applied to the synthesis of a translocator­ protein (TSPO) ligand.

scholarly journals Selectfluor-triggered fluorination/cyclization of o-hydroxyarylenaminones: A facile access to 3-fluoro-chromones

2020 ◽  
pp. 174751982092308
Author(s):  
Yanqin Wang ◽  
Biao Hu ◽  
Qiaohe Zhang ◽  
Siyun Zhao ◽  
Yuxuan Zhao ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
High Resolution ◽  
13C Nmr ◽  
Potassium Carbonate ◽  
High Resolution Mass Spectrometry ◽  
Reactive Intermediates ◽  
Cyclization Reaction ◽  
Plausible Mechanism ◽  
Tandem Cyclization ◽  
Resolution Mass

A fast and efficient Selectfluor-triggered fluorination/cyclization reaction of o-hydroxyarylenaminones has been successfully developed. The reaction successfully provides an expedient method for the synthesis of 3-fluoro-chromones promoted by potassium carbonate, which shows readily available starting materials and is easy to operate. In addition, a plausible mechanism of this tandem cyclization reaction was proposed where 4 H-chromen-4-one, 2-(dimethylamino)-3,3-difluorochroman-4-one, and 3,3-difluoro-2-hydroxychroman-4-one were not found to be the reactive intermediates. Moreover, these novel compounds have been obtained in moderate to good yields, and their structures have been confirmed by 1H NMR, 13C NMR, and high-resolution mass spectrometry.

Highly enantioselective oxidative tandem cyclization reaction: a chiral ligand and an anion cooperatively control stereoselectivity

2014 ◽  
Vol 1 (5) ◽  
pp. 473-476 ◽  
Author(s):  
Yu-Ping He ◽  
Hua Wu ◽  
Lue Xu ◽  
Yong-Liang Su ◽  
Liu-Zhu Gong
Keyword(s):  
Phosphoric Acid ◽  
Cyclization Reaction ◽  
Chiral Ligand ◽  
Highly Efficient ◽  
Straightforward Method ◽  
Chiral Phosphoric Acid ◽  
Tandem Cyclization

The unprecedented combination of a palladium(ii) complex with a chiral Bu-QUOX ligand and a chiral phosphoric acid enables the highly efficient asymmetric oxidative tandem cyclization reaction, providing a straightforward method to access chiral 6,5-bicyclic aza-heterocycles in moderate to good yields and with excellent enantioselectivities.

ChemInform Abstract: Total Synthesis of (-)-Neplanocin A by Using Lithium Thiolate-Initiated Michael-Aldol Tandem Cyclization Reaction.

ChemInform ◽  
2010 ◽  
Vol 33 (21) ◽  
pp. no-no
Author(s):  
Masashi Ono ◽  
Katsumi Nishimura ◽  
Hiroshi Tsubouchi ◽  
Yasuo Nagaoka ◽  
Kiyoshi Tomioka
Keyword(s):  
Total Synthesis ◽  
Cyclization Reaction ◽  
Neplanocin A ◽  
Tandem Cyclization
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