scholarly journals Recent Advances in the Synthesis of Hydrogenated Azocine-Containing­ Molecules

Synthesis ◽  
2017 ◽  
Vol 49 (17) ◽  
pp. 3801-3834 ◽  
Author(s):  
Anna Listratova ◽  
Leonid Voskressensky
Keyword(s):  
Ring Opening ◽  
Aldol Condensation ◽  
Ring Expansion ◽  
Radical Cyclization ◽  
Primary Amines ◽  
Ring Closing Metathesis ◽  
Recent Advances ◽  
Activated Alkynes ◽  
Ring Expansion Reaction ◽  
Metal Catalyzed

This review covers recent advances in synthesis of azocine-containing systems. The most approaches towards azocines are discussed.1 Introduction2 Ring-Expansion Reaction2.1 Ring-Expansion Reaction of Cyclopentane Containing the 1,4-Diketone Moiety with Primary Amines (from 5 to 8)2.2 Ring-Expansion Reaction of Annulated Tetrahydropyridines under the Action of Activated Alkynes (from 6 to 8)2.3 Reductive Ring-Expansion Reaction of Cyclic Oximes2.4 Other Ring-Expansion Reactions3 Heck Reaction4 Cycloaddition5 Ring-Closing Metathesis (RCM)6 Cyclization6.1 Metal-Catalyzed Cyclization6.2 Radical Cyclization6.3 Friedel–Crafts Cyclization6.4 Other Examples of Cyclizations7 Microwave- and Photo-Assisted Reactions8 Other Methods8.1 Cascade and Tandem Reactions8.2 Aldol Condensation8.3 Thermolysis8.4 Ring Opening8.5 Other Methods9 Conclusion

scholarly journals Applications of "planar-chiral" heterocycles in asymmetric catalysis

2001 ◽  
Vol 73 (7) ◽  
pp. 1113-1116 ◽  
Author(s):  
Gregory C. Fu
Keyword(s):  
Asymmetric Catalysis ◽  
Ring Opening ◽  
Kinetic Resolution ◽  
Ring Expansion ◽  
Chiral Ligands ◽  
Primary Amines ◽  
Allylic Alcohols ◽  
Catalyzed Reactions ◽  
Metal Catalyzed ◽  
Derivatives Of

Planar-chiral derivatives of pyridine function as efficient catalysts for processes such as the kinetic resolution of primary amines and the desymmetrization/ring-opening of meso epoxides. Planar-chiral pyrrolyl and phospholyl derivatives serve as effective chiral ligands for a range of metal-catalyzed reactions, including the copper-catalyzed ring-expansion of oxetanes and the rhodium-catalyzed isomerization of allylic alcohols.

Ligand-modulated ring-expansion

2019 ◽  
Vol 55 (9) ◽  
pp. 1245-1248
Author(s):  
Veronica Carta ◽  
Miguel A. Soto ◽  
Mark J. MacLachlan
Keyword(s):  
Ring Opening ◽  
Ring Expansion ◽  
Coordination Site ◽  
Ring Expansion Reaction ◽  
Bulky Ligand ◽  
Fourth Coordination

An unstrained metal-containing macrocycle was ring-expanded by a ring-opening metathesis strategy, leading to the formation of a bimetallic dimeric macrocycle. The reaction is driven by coordination of a bulky ligand, 2,6-lutidine, on the fourth coordination site of the palladium center. In the absence of metal, or with a less bulky ligand, the ring-expansion reaction does not proceed.

scholarly journals Synthesis of quinoline-3-carboxylates by a Rh(II)-catalyzed cyclopropanation-ring expansion reaction of indoles with halodiazoacetates

2015 ◽  
Vol 11 ◽  
pp. 1944-1949 ◽  
Author(s):  
Magnus Mortén ◽  
Martin Hennum ◽  
Tore Bonge-Hansen
Keyword(s):  
Ring Opening ◽  
Ring Expansion ◽  
Novel Synthesis ◽  
Ring Expansion Reaction

In this letter, we report a novel synthesis of ethyl quinoline-3-carboxylates from reactions between a series of indoles and halodiazoacetates. The formation of the quinoline structure is probably the result of a cyclopropanation at the 2- and 3-positions of the indole followed by ring-opening of the cyclopropane and elimination of H–X.

Chelation-assisted transition metal-catalysed C–H chalcogenylations

2020 ◽  
Vol 7 (8) ◽  
pp. 1022-1060 ◽  
Author(s):  
Wenbo Ma ◽  
Nikolaos Kaplaneris ◽  
Xinyue Fang ◽  
Linghui Gu ◽  
Ruhuai Mei ◽  
...  
Keyword(s):  
Transition Metal ◽  
Recent Advances ◽  
Site Selectivity ◽  
Transition Metal Catalyzed ◽  
Metal Catalyzed

This review summarizes recent advances in C–S and C–Se formations via transition metal-catalyzed C–H functionalization utilizing directing groups to control the site-selectivity.

One-Pot Tandem Ring-Opening and Ring-Closing Metathesis Polymerization of Disubstituted Cyclopentenes Featuring a Terminal Alkyne Functionality

2020 ◽  
Vol 53 (11) ◽  
pp. 4330-4337
Author(s):  
Santhosh Kumar Podiyanachari ◽  
Salvador Moncho ◽  
Edward N. Brothers ◽  
Saeed Al-Meer ◽  
Mohammed Al-Hashimi ◽  
...  
Keyword(s):  
Ring Opening ◽  
Terminal Alkyne ◽  
Ring Closing Metathesis ◽  
One Pot ◽  
Metathesis Polymerization

scholarly journals Controlled Ring-Opening Polymerization of O-Carboxyanhydrides to Synthesize Functionalized Poly(α-Hydroxy Acids)

2021 ◽  
Vol 03 (01) ◽  
pp. 041-050
Author(s):  
Xiaoqian Wang ◽  
Ai Lin Chin ◽  
Rong Tong
Keyword(s):  
Biomedical Engineering ◽  
Ring Opening ◽  
Ring Opening Polymerization ◽  
Metal Catalyst ◽  
Hydroxy Acids ◽  
Controlled Polymerization ◽  
Biodegradable Polyesters ◽  
Recent Advances

Poly(α-hydroxy acids), as a family of biodegradable polyesters, are valuable materials due to their broad applications in packaging, agriculture, and biomedical engineering. Herein we highlight and explore recent advances of catalysts in controlled ring-opening polymerization of O-carboxyanhydrides towards functionalized poly(α-hydroxy acids), especially metal catalyst-mediated controlled polymerization. Limitations of current polymerization strategies of O-carboxyanhydrides are discussed.

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