Reversal of Diastereoselectivity in Reactions of the Trifluoroacetaldehyde Ethyl Hemiacetal with Enamines and Imines: Metal-Free, Complementaryanti- andsyn-Selective Synthesis of 4,4,4-Trifluoro-1-aryl-3-hydroxy-2-methyl-1-butanones

2011 ◽  
Vol 76 (1) ◽  
pp. 285-288 ◽  
Author(s):  
Kazumasa Funabiki ◽  
Kei Matsunaga ◽  
Hiroshi Gonda ◽  
Hitoshi Yamamoto ◽  
Takao Arima ◽  
...  
Keyword(s):  
Selective Synthesis ◽  
Metal Free

A Sequential Ugi-Smiles / Transition-Metal-Free Endo-Dig Conia-ene Cyclization: The Selective Synthesis of Saccharin Substituted 2,5-dihydropyrroles

2021 ◽  
Author(s):  
Hassan Seyrani ◽  
Sorour Ramezanpour ◽  
Aref Vaezghaemi ◽  
Farzad Kobarfard
Keyword(s):  
Transition Metal ◽  
Free Access ◽  
Selective Synthesis ◽  
Metal Free ◽  
Mild Conditions

A convenient, transition-metal-free access to a series of unprecedented saccharin substituted 2,5-dihydropyrroles is reported. This approach employs a post-Ugi-Smiles 5-endo-dig Conia-ene cyclization sequence in mild conditions while incorporating a series...

PEG-400 as carbon synthon: highly selective synthesis of quinolines and methylquinolines under metal-free conditions

2021 ◽  
Author(s):  
Chengcheng Ding ◽  
Shichen Li ◽  
Kaili Feng ◽  
Ma Chen
Keyword(s):  
Selective Synthesis ◽  
Efficient Procedure ◽  
Metal Free ◽  
Peg 400

A metal-free, peroxide-free, and efficient procedure for the highly selective synthesis of quinolines and methylquinolines was reported. The main feature of this method was that the same substrate can produce...

TBAI-catalyzed selective synthesis of sulfonamides and β-aryl sulfonyl enamines: coupling of arenesulfonyl chlorides and sodium sulfinates with tert-amines

2019 ◽  
Vol 17 (10) ◽  
pp. 2715-2720 ◽  
Author(s):  
Hongmei Jiang ◽  
Xiaoyue Tang ◽  
Zhihui Xu ◽  
Huixian Wang ◽  
Kang Han ◽  
...  
Keyword(s):  
Selective Synthesis ◽  
Metal Free ◽  
Catalyzed Oxidation

A simple, practical and metal-free method for the synthesis of title compounds via the selective cleavage of C–N and C–H bonds through the iodine-catalyzed oxidation of arenesulfonyl chlorides and sodium sulfinates with tert-amines.

Sodium persulfate-promoted site-selective synthesis of mononitroarylamines under transition-metal-free conditions

Tetrahedron ◽  
2019 ◽  
Vol 75 (9) ◽  
pp. 1157-1165
Author(s):  
De-Xun Xie ◽  
Hui-Juan Yu ◽  
Hui Liu ◽  
Wei-Cai Xue ◽  
Yuan-Shou Qin ◽  
...  
Keyword(s):  
Transition Metal ◽  
Selective Synthesis ◽  
Sodium Persulfate ◽  
Metal Free ◽  
Site Selective

Photoinduced Oxidative Cross-Coupling for O–S Bond Formation: A Facile Synthesis of Alkyl Benzenesulfonates

Synlett ◽  
2017 ◽  
Vol 28 (13) ◽  
pp. 1558-1563 ◽  
Author(s):  
Aiwen Lei ◽  
Atul Singh ◽  
Hong Yi ◽  
Guoting Zhang ◽  
Changliang Bian ◽  
...  
Keyword(s):  
Visible Light ◽  
Bond Formation ◽  
Cross Coupling ◽  
Selective Synthesis ◽  
Mechanistic Studies ◽  
Facile Synthesis ◽  
Metal Free

We have developed a photoinduced oxidative cross-coupling of thiophenols with alcohols for O–S bond formation. The protocol uses visible light, a metal-free photocatalyst, and oxygen as the oxidant for the selective synthesis of alkyl benzenesulfonates; no ligand co-additive is necessary. Mechanistic studies suggested that the disulfide and alkyl benzenesulfinate are involved as intermediates and that the transformation proceeds by a radical pathway.

Transition-Metal-Free Atropo-Selective Synthesis of Biaryl Compounds Based on Arynes

2012 ◽  
Vol 18 (45) ◽  
pp. 14232-14236 ◽  
Author(s):  
Frédéric R. Leroux ◽  
Anaïs Berthelot ◽  
Laurence Bonnafoux ◽  
Armen Panossian ◽  
Françoise Colobert
Keyword(s):  
Transition Metal ◽  
Selective Synthesis ◽  
Metal Free ◽  
Biaryl Compounds

Divergent Reactions between Alkynes and Dibenzenesulfonimide: Selective Synthesis of Ynamides and Enamides under Metal‐Free Conditions

2019 ◽  
Vol 8 (4) ◽  
pp. 537-541 ◽  
Author(s):  
Dehu Xiang ◽  
Huan Li ◽  
Ling Zhang ◽  
Yunhua Zhang ◽  
Qian Zhang ◽  
...  
Keyword(s):  
Selective Synthesis ◽  
Metal Free

Substrate selective synthesis of pyrazolo[1,5-a]pyridines through [3 + 2] cycloaddition of N-aminopyridines and β-nitro styrenes

RSC Advances ◽  
2015 ◽  
Vol 5 (53) ◽  
pp. 42961-42964 ◽  
Author(s):  
Chitrakar Ravi ◽  
Darapaneni Chandra Mohan ◽  
N. Naresh Kumar Reddy ◽  
Subbarayappa Adimurthy
Keyword(s):  
Selective Synthesis ◽  
Metal Free ◽  
Mild Conditions

Synthesis of 2 or 3-(hetero)aryl pyrazolo[1,5-a]pyridines through [3 + 2] cycloaddition ofN-aminopyridine with β-nitrostyrenes followed byin situdenitration under metal-free and mild conditions are described.

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