scholarly journals Metal-Free and Alkali-Metal-Catalyzed Synthesis of Isoureas from Alcohols and Carbodiimides

2018 ◽  
Vol 130 (12) ◽  
pp. 3138-3142 ◽  
Author(s):  
Arnaud Imberdis ◽  
Guillaume Lefèvre ◽  
Pierre Thuéry ◽  
Thibault Cantat
Keyword(s):  
Alkali Metal ◽  
Metal Free ◽  
Metal Catalyzed

scholarly journals Metal-Free and Alkali-Metal-Catalyzed Synthesis of Isoureas from Alcohols and Carbodiimides

2018 ◽  
Vol 57 (12) ◽  
pp. 3084-3088 ◽  
Author(s):  
Arnaud Imberdis ◽  
Guillaume Lefèvre ◽  
Pierre Thuéry ◽  
Thibault Cantat
Keyword(s):  
Alkali Metal ◽  
Metal Free ◽  
Metal Catalyzed

scholarly journals Recent Advances in Transition-Metal-Free (4+3)-Annulations

Synthesis ◽  
2021 ◽  
Author(s):  
Heather Lam ◽  
Mark Lautens ◽  
Xavier Abel-Snape ◽  
Martin F. Köllen
Keyword(s):  
Transition Metal ◽  
Boronic Acid ◽  
Lewis Acids ◽  
Acid Catalysis ◽  
Heterocyclic Carbenes ◽  
Bronsted Acids ◽  
Metal Free ◽  
Previous Review ◽  
Dual Activation ◽  
Metal Catalyzed

Abstract(4+3)-Annulations are incredibly versatile reactions which combine a 4-atom synthon and a 3-atom synthon to form both 7-membered carbocycles as well as heterocycles. We have previously reviewed transition-metal-catalyzed (4+3)-annulations. In this review, we will cover examples involving bases, NHCs, phosphines, Lewis and Brønsted acids as well as some rare examples of boronic acid catalysis and photocatalysis. In analogy to our previous review, we exclude annulations involving cyclic dienes like furan, pyrrole, cyclohexadiene or cyclopentadiene, as Chiu, Harmata, Fernándes and others have recently published reviews encompassing such substrates. We will however discuss the recent additions (2010–2020) to the literature on (4+3)-annulations involving other types of 4-atom-synthons.1 Introduction2 Bases3 Annulations Using N-Heterocyclic Carbenes3.1 N-Heterocyclic Carbenes (NHCs)3.2 N-Heterocyclic Carbenes and Base Dual-Activation4 Phosphines5 Acids5.1 Lewis Acids5.2 Brønsted Acids6 Boronic Acid Catalysis and Photocatalysis7 Conclusion

Alkali metal catalyzed carbon dioxide gasification of carbon

1992 ◽  
Vol 6 (4) ◽  
pp. 343-351 ◽  
Author(s):  
Toshimitsu Suzuki ◽  
Hiroyuki Ohme ◽  
Yoshihisa Watanabe
Keyword(s):  
Carbon Dioxide ◽  
Alkali Metal ◽  
Gasification Of Carbon ◽  
Metal Catalyzed ◽  
Carbon Dioxide Gasification

scholarly journals Oxidizing agents in metal-catalyzed and metal-free C-H functionalization of heteroarenes.

ARKIVOC ◽  
2021 ◽  
Vol 2021 (9) ◽  
Author(s):  
Irina Alexandrovna Utepova ◽  
Oleg Nikolaevich Chupakhin ◽  
Maria Alexandrovna Trestsova ◽  
Alexandra Alexandrovna Musikhina ◽  
Alexandr Alexandrovich Shchepochkin ◽  
...  
Keyword(s):  
Metal Free ◽  
Oxidizing Agents ◽  
Metal Catalyzed

Five-Membered Hetarene N-Oxides: Recent Advances in Synthesis and Reactivity

Synthesis ◽  
2021 ◽  
Author(s):  
Leonid Fershtat ◽  
Fedor Teslenko
Keyword(s):  
Transition Metal ◽  
Medicinal Chemistry ◽  
Materials Science ◽  
State Of The Art ◽  
Short Review ◽  
Advanced Materials ◽  
Metal Free ◽  
Recent Advances ◽  
Application Potential ◽  
Metal Catalyzed

Five-membered heterocyclic N-oxides attracted special attention due to their strong application potential in medicinal chemistry and advanced materials science. In this regard, novel methods for their synthesis and functionalization are constantly required. In this short review, recent state-of-the-art achievements in the chemistry of isoxazoline N-oxides, 1,2,3-triazole 1-oxides and 1,2,5-oxadiazole 2-oxides are briefly summarized. Main routes to transition-metal-catalyzed and metal-free functionalization protocols along with mechanistic considerations are outlined. Transformation patterns of the hetarene N-oxide rings as precursors to other nitrogen heterocyclic systems are also presented.

scholarly journals Heteroaryliodonium(III) Salts as Highly Reactive Electrophiles

2020 ◽  
Vol 8 ◽  
Author(s):  
Naoko Takenaga ◽  
Ravi Kumar ◽  
Toshifumi Dohi
Keyword(s):  
High Reactivity ◽  
Hypervalent Iodine ◽  
Metal Free ◽  
Diaryliodonium Salts ◽  
Metal Catalyzed ◽  
Synthetic Transformations

In recent years, the chemistry of heteroaryliodonium(III) salts has undergone significant developments. Heteroaryliodonium(III) salts have been found to be useful synthetic tools for the transfer of heteroaryl groups under metal-catalyzed and metal-free conditions for the preparation of functionalized heteroarene-containing compounds. Synthetic transformations mediated by these heteroaryliodonium(III) salts are classified into two categories: (1) reactions utilizing the high reactivity of the hypervalent iodine(III) species, and (2) reactions based on unique and new reactivities not observed in other types of conventional diaryliodonium salts. The latter feature is of particular interest and so has been intensively investigated in recent decades. This mini-review therefore aims to summarize the recent synthetic applications of heteroaryliodonium(III) salts as highly reactive electrophiles.

Alkali-Metal-Catalyzed Cross-Dehydrogenative Couplings of Hydrosilanes with Amines

ChemCatChem ◽  
2016 ◽  
Vol 8 (7) ◽  
pp. 1373-1378 ◽  
Author(s):  
Srinivas Anga ◽  
Yann Sarazin ◽  
Jean-François Carpentier ◽  
Tarun K. Panda
Keyword(s):  
Alkali Metal ◽  
Metal Catalyzed

Ligand Effect in Alkali‐Metal‐Catalyzed Transfer Hydrogenation of Ketones

2019 ◽  
Vol 25 (50) ◽  
pp. 11734-11744 ◽  
Author(s):  
Iryna D. Alshakova ◽  
Hayden C. Foy ◽  
Travis Dudding ◽  
Georgii I. Nikonov
Keyword(s):  
Alkali Metal ◽  
Transfer Hydrogenation ◽  
Ligand Effect ◽  
Metal Catalyzed
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