Pyridopyrimidines. 6. Nucleophilic substitutions in the pyrido[2,3-d]pyrimidine series

1977 ◽  
Vol 42 (6) ◽  
pp. 993-996 ◽  
Author(s):  
Gary L. Anderson ◽  
Jaewon L. Shim ◽  
Arthur D. Broom
Keyword(s):  
Nucleophilic Substitutions ◽  
Pyrimidine Series

scholarly journals Circular linkage of intramolecular multi-hydrogen bonding frameworks through nucleophilic substitutions of β-dicarbonyls onto cyanuric chloride and subsequent tautomerisation

RSC Advances ◽  
2020 ◽  
Vol 10 (64) ◽  
pp. 39033-39036
Author(s):  
Ayano Awatani ◽  
Masaaki Suzuki
Keyword(s):  
Hydrogen Bonding ◽  
Cyanuric Chloride ◽  
Nucleophilic Substitutions ◽  
Hydrogen Bonding Interactions ◽  
Triazine Derivatives

Triply β-dicarbonyl-embedded 1,3,5-triazine derivatives result in formation of circular linkage of resonance-assisted hydrogen bonding interactions, which can be regarded as well-delocalized resonance hybrids.

scholarly journals Biocatalysis with Laccases: An Updated Overview

Catalysts ◽  
2020 ◽  
Vol 11 (1) ◽  
pp. 26
Author(s):  
Ivan Bassanini ◽  
Erica Elisa Ferrandi ◽  
Sergio Riva ◽  
Daniela Monti
Keyword(s):  
Organic Synthesis ◽  
Alcohol Oxidation ◽  
Industrial Processes ◽  
Organic Substrates ◽  
Fine Chemicals ◽  
Multicopper Oxidases ◽  
Carbohydrate Chemistry ◽  
Nucleophilic Substitutions ◽  
Mediator System ◽  
Integrated Processes

Laccases are multicopper oxidases, which have been widely investigated in recent decades thanks to their ability to oxidize organic substrates to the corresponding radicals while producing water at the expense of molecular oxygen. Besides their successful (bio)technological applications, for example, in textile, petrochemical, and detoxifications/bioremediations industrial processes, their synthetic potentialities for the mild and green preparation or selective modification of fine chemicals are of outstanding value in biocatalyzed organic synthesis. Accordingly, this review is focused on reporting and rationalizing some of the most recent and interesting synthetic exploitations of laccases. Applications of the so-called laccase-mediator system (LMS) for alcohol oxidation are discussed with a focus on carbohydrate chemistry and natural products modification as well as on bio- and chemo-integrated processes. The laccase-catalyzed Csp2-H bonds activation via monoelectronic oxidation is also discussed by reporting examples of enzymatic C-C and C-O radical homo- and hetero-couplings, as well as of aromatic nucleophilic substitutions of hydroquinones or quinoids. Finally, the laccase-initiated domino/cascade synthesis of valuable aromatic (hetero)cycles, elegant strategies widely documented in the literature across more than three decades, is also presented.

Some nucleophilic substitutions in 2,4-and 2,4,8-trichloro-pyrido [3,2-d] pyrimidines

1989 ◽  
Vol 12 (1) ◽  
pp. 8-11
Author(s):  
Said M. Boyomi ◽  
Abdel-Kader M. Ismaiel ◽  
Hassan M. Eisa ◽  
Mohmed M. El-Kerdawy
Keyword(s):  
Nucleophilic Substitutions

ChemInform Abstract: α-Fluorohydrazones as Useful Precursors in Nucleophilic Substitutions.

ChemInform ◽  
2013 ◽  
Vol 44 (46) ◽  
pp. no-no
Author(s):  
Ryota Yunoki ◽  
Atsushi Yajima ◽  
Tsuyoshi Taniguchi ◽  
Hiroyuki Ishibashi
Keyword(s):  
Nucleophilic Substitutions
Sign in / Sign up

Export Citation Format

Share Document