scholarly journals Synthetic strategies for aryl/heterocyclic selenides and tellurides under transition-metal-catalyst free conditions

RSC Advances ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 6682-6698
Author(s):  
Debasish Kundu
Keyword(s):  
Transition Metal ◽  
Visible Light ◽  
Ball Milling ◽  
Microwave Heating ◽  
Metal Catalyst ◽  
Visible Light Photocatalysis ◽  
Transition Metal Catalyst ◽  
Catalyst Free

Synthesis of aryl and heteroaryl selenides and tellurides are summerized under transition free sustainable conditions by using greener reagents and techniques such as ball milling, microwave heating, ultrasound, visible light photocatalysis etc.

Visible Light and Hydroxynaphthylbenzimidazoline Promoted Transition-Metal-Catalyst-Free Desulfonylation of N-Sulfonylamides and N-Sulfonylamines

2018 ◽  
Vol 83 (18) ◽  
pp. 10813-10825 ◽  
Author(s):  
Eietsu Hasegawa ◽  
Yuto Nagakura ◽  
Norihiro Izumiya ◽  
Keisuke Matsumoto ◽  
Tsukasa Tanaka ◽  
...  
Keyword(s):  
Transition Metal ◽  
Visible Light ◽  
Metal Catalyst ◽  
Transition Metal Catalyst ◽  
Catalyst Free

scholarly journals Transition Metal Catalyst‐Free, Base‐Promoted 1,2‐Additions of Polyfluorophenylboronates to Aldehydes and Ketones

2021 ◽  
Author(s):  
Zhiqiang Liu ◽  
Goutam Kumar Kole ◽  
Yudha P. Budiman ◽  
Ya-Ming Tian ◽  
Alexandra Friedrich ◽  
...  
Keyword(s):  
Transition Metal ◽  
Metal Catalyst ◽  
Free Base ◽  
Transition Metal Catalyst ◽  
Catalyst Free ◽  
Aldehydes And Ketones

Transition Metal Catalyst, Solvent, Base Free Synthesis of Diaryl Diselenides under Mechanical Ball Milling

2021 ◽  
Vol 19 ◽  
Author(s):  
Debasish Kundu ◽  
Anup Roy ◽  
Subir Panja
Keyword(s):  
Transition Metal ◽  
Ball Milling ◽  
Room Temperature ◽  
General Procedure ◽  
Cross Coupling ◽  
High Yield ◽  
Metal Catalyst ◽  
Transition Metal Catalyst ◽  
Wide Range ◽  
Mechanical Ball Milling

Abstract: A convenient, efficient, and general procedure for the synthesis of diaryl diselenides has been developed by the reaction of aryl diazonium tetrafluoroborates and Potassium Selenocyanate on the surface of alumina under ball-milling in absence of any solvent, transition metal catalyst and base in room temperature. A wide range of functionalized diaryl diselenides are obtained in high purity and high yield by this procedure. Background: Synthesis of diaryl diselenides was restricted into only few Cu-catalyzed C-Se Cross coupling protocol where use of ligands, high reaction temp, long reaction time were required Objective: To achieve a sustainable protocol for the synthesis of diaryl diselenides Method: Reaction of aryl diazonium fluoroborate with KSeCN was successfully performed under ball milling in absence of any ransition metal catalyst, ligands, base and external heating to get diaryl diselenides. Results: A library of diaryl diselenides were obtained in good yields with different functional groups. Conclusion: First transition metal free protocol for the synthesis of diaryl diselenides has been developed successfully.

Catalyst-free chemoselective conjugate addition and reduction of α,β-unsaturated carbonyl compounds via a controllable boration/protodeboronation cascade pathway

2018 ◽  
Vol 20 (1) ◽  
pp. 255-260 ◽  
Author(s):  
Xi Huang ◽  
Junjie Hu ◽  
Mengying Wu ◽  
Jiayi Wang ◽  
Yanqing Peng ◽  
...  
Keyword(s):  
Transition Metal ◽  
Carbonyl Compounds ◽  
Conjugate Addition ◽  
Metal Catalyst ◽  
Transition Metal Catalyst ◽  
Catalyst Free

A transition-metal-catalyst-free method provides a useful and eco-friendly tool for the chemoselective conjugate addition and reduction of α,β-unsaturated carbonyl compounds.

scholarly journals Transition Metal Catalyst Free Cross-Coupling Reaction of Tertiary Propargylic Alcohols with Hetero-Areneboronic Acids

2021 ◽  
Author(s):  
Jian-Fei Bai ◽  
Jianbo Tang ◽  
Xiaolong Gao ◽  
Zhi-Jiang Jiang ◽  
Zhanghua Gao
Keyword(s):  
Transition Metal ◽  
Coupling Reaction ◽  
Cross Coupling ◽  
Metal Catalyst ◽  
Transition Metal Catalyst ◽  
Propargylic Alcohols ◽  
Catalyst Free ◽  
Cross Coupling Reaction ◽  
Reaction Proceeds ◽  
Acid Catalyzed

We report a perfluorophenylboronic acid catalyzed cross coupling reaction of tertiary propargylic alcohols and hetero-areneboronic acids for valuable benzo[b]thiophene and cyclopenta[a]indene derivates. This coupling reaction proceeds efficiently with a wide array of substrates scope in up to 89% yield and excellent regioselectivity. A significant advantage of our protocol is the transition metal catalyst free and mild conditions needed. This strategy provides direct and facile access to medicinally important benzo[b]thiophene and cyclopenta[a]indene scaffold containing a quaternary carbon center.

scholarly journals Transition Metal Catalyst Free Cross-Coupling Reaction of Tertiary Propargylic Alcohols with Hetero-Areneboronic Acids

2022 ◽  
Author(s):  
Jian-Fei Bai ◽  
Jianbo Tang ◽  
Xiaolong Gao ◽  
Zhi-Jiang Jiang ◽  
Jia Chen ◽  
...  
Keyword(s):  
Transition Metal ◽  
Coupling Reaction ◽  
Cross Coupling ◽  
Metal Catalyst ◽  
Transition Metal Catalyst ◽  
Propargylic Alcohols ◽  
Catalyst Free ◽  
Cross Coupling Reaction ◽  
Reaction Proceeds ◽  
Acid Catalyzed

We report a perfluorophenylboronic acid catalyzed cross coupling reaction of tertiary propargylic alcohols and hetero-areneboronic acids for valuable benzo[b]thiophene and cyclopenta[a]indene derivates. This coupling reaction proceeds efficiently with a wide array of substrates scope in up to 89% yield and excellent regioselectivity. A significant advantage of our protocol is the transition metal catalyst free and mild conditions needed. This strategy provides direct and facile access to medicinally important benzo[b]thiophene and cyclopenta[a]indene scaffold containing a quaternary carbon center.

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