scholarly journals Recent Progress in Metal-Free Direct Synthesis of Imidazo[1,2-a]pyridines

ACS Omega ◽  
2021 ◽  
Author(s):  
Vanya Kurteva
Keyword(s):  
Recent Progress ◽  
Direct Synthesis ◽  
Metal Free

Metal-Free Catalytic Aromatic C–H Borylation

Synlett ◽  
2020 ◽  
Vol 31 (19) ◽  
pp. 1857-1861
Author(s):  
Hua Zhang ◽  
Li Wang
Keyword(s):  
Transition Metal ◽  
Recent Progress ◽  
Rapid Development ◽  
Transition Metal Catalysis ◽  
Mechanistic Studies ◽  
Metal Catalysis ◽  
Promising Alternative ◽  
Metal Free ◽  
History Of ◽  
Near Future

In recent decades, C–H borylation has undergone rapid development and has become one of the most important and efficient methods for the synthesis of organoboron compounds. Although transition-metal catalysis dominates C–H borylation, the metal-free approach has emerged as a promising alternative strategy. This article briefly summarizes the history of metal-free aromatic C–H borylation, including early reports on electrophilic C–H borylation and recent progress in metal-free catalytic intermolecular C–H borylation; it also highlights our recent work on BF3·Et2O-catalyzed C2–H borylation of hetarenes. Despite these recent advances, comprehensive mechanistic studies on various metal-free catalytic aromatic C–H borylations and novel processes with a wider substrate scope are eagerly expected in the near future.

Recent progress in the direct synthesis of γ-valerolactone from biomass-derived sugars catalyzed by RANEY® Ni–Sn alloy supported on aluminium hydroxide

2020 ◽  
Vol 10 (22) ◽  
pp. 7768-7778
Author(s):  
Rodiansono ◽  
Maria Dewi Astuti ◽  
Kamilia Mustikasari ◽  
Sadang Husain ◽  
Sutomo
Keyword(s):  
Aluminum Hydroxide ◽  
Aluminium Hydroxide ◽  
Recent Progress ◽  
Direct Synthesis ◽  
Reaction Conditions

Direct synthesis of γ-valerolactone from sugars using RANEY® nickel–tin alloy supported on aluminum hydroxide catalysts under mild reaction conditions produced an outstanding yield up to 74.9%.

A cascade process for the synthesis of ortho-formyl allyl aryl ethers and 2H-chromen-2-ol derivatives from arynes via trapping of o-quinone methide with an activated alkene

2019 ◽  
Vol 17 (2) ◽  
pp. 333-346 ◽  
Author(s):  
Abhilash Sharma ◽  
Pranjal Gogoi
Keyword(s):  
Transition Metal ◽  
Direct Synthesis ◽  
Quinone Methide ◽  
Cascade Process ◽  
Metal Free ◽  
Synthetic Strategy ◽  
Aryl Ethers ◽  
Three Component Coupling

A transition-metal free synthetic strategy for the direct synthesis of ortho-formyl substituted allyl aryl ethers and 2H-chromen-2-ol derivatives via a cascade three-component coupling of arynes, activated alkene and N,N-dimethylformamide.

Emerging new generation electrocatalysts for the oxygen reduction reaction

2016 ◽  
Vol 4 (29) ◽  
pp. 11156-11178 ◽  
Author(s):  
C. Retna Raj ◽  
Arpan Samanta ◽  
Seung Hyo Noh ◽  
Siniya Mondal ◽  
Takeyoshi Okajima ◽  
...  
Keyword(s):  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Noble Metal ◽  
Recent Progress ◽  
Reduction Reaction ◽  
Cathodic Reduction ◽  
Metal Free ◽  
New Class ◽  
New Generation

Recent progress in the development of a new class of inexpensive metal-free and non-noble metal-based electrocatalysts for the cathodic reduction of oxygen is discussed.

scholarly journals Straightforward Strategies for the Preparation of NH-Sulfox­imines: A Serendipitous Story

Synlett ◽  
2017 ◽  
Vol 28 (19) ◽  
pp. 2525-2538 ◽  
Author(s):  
James Bull ◽  
Renzo Luisi ◽  
Leonardo Degennaro
Keyword(s):  
Transition Metal ◽  
Physicochemical Properties ◽  
Direct Synthesis ◽  
Transition Metal Catalysts ◽  
Hypervalent Iodine ◽  
Reaction Conditions ◽  
One Pot ◽  
Metal Free ◽  
Recent Developments ◽  
New Procedures

Sulfoximines are emerging as valuable new isosteres for use in medicinal chemistry, with the potential to modulate physicochemical properties. Recent developments in synthetic strategies have made the unprotected ‘free’ NH-sulfoximine group more readily available, facilitating further study. This account reviews approaches to NH-sulfoximines, with a focus on our contribution to the field. Starting from the development of catalytic strategies involving transition metals, more sustainable metal-free processes have been discovered. In particular, the use of hypervalent iodine reagents to mediate NH-transfer to sulfoxides is described, along with an assessment of the substrate scope. Furthermore, a one-pot strategy to convert sulfides directly into NH-sulfoximines is discussed, with N- and O-transfer occurring under the reaction conditions. Mechanistic evidence for the new procedures is included as well as relevant synthetic applications that further exemplify the potential of these approaches.1 Introduction2 Strategies to Form NH-Sulfoximines Involving Transition-Metal Catalysts3 Metal-Free Strategies to Prepare NH-Sulfoximines4 Mechanistic Evidence for the Direct Synthesis of NH-Sulfoximines from Sulfoxides and Sulfides5 Further Applications6 Conclusion

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