scholarly journals Electrophilic Cyclization of Diterpenoids

2006 ◽  
Vol 1 (1) ◽  
pp. 22-35
Author(s):  
Veaceslav Kulciţki ◽  
Marina Grinco ◽  
Pavel Vlad ◽  
Nicon Ungur
Keyword(s):  
Lewis Acids ◽  
Electrophilic Cyclization ◽  
Cyclization Reactions ◽  
Practical Utility ◽  
Electrophilic Reagents

A review of diterpenoid cyclization initiated by electrophilic reagents is provided. Conventional protonic and Lewis acids are examined along with superacids as initiators of cyclization cascade. An emphasis is placed on the use of cyclization reactions as a tool for the synthesis of compounds with potential practical utility. The review contains 74 references.

Iodine-mediated regioselective 5-endo-dig electrophilic cyclization reaction of selenoenynes: synthesis of selenophene derivatives

2017 ◽  
Vol 4 (2) ◽  
pp. 277-282 ◽  
Author(s):  
Renan P. Pistoia ◽  
Juliano A. Roehrs ◽  
Davi F. Back ◽  
Gilson Zeni
Keyword(s):  
Cyclization Reaction ◽  
Electrophilic Cyclization ◽  
Cyclization Reactions

Selenoenynes underwent electrophilic cyclization reactions with iodine in the presence of an appropriate nucleophile to give 3-iodo-selenophenes and 3-organoselenyl-selenophenes.

Synthesis of (±)-albicanyl acetate and (±)-isodrimenin by the electrophilic cyclization of olefinic allylsilanes

1986 ◽  
Vol 64 (5) ◽  
pp. 1002-1006 ◽  
Author(s):  
Rosemary J. Armstrong ◽  
Francis L. Harris ◽  
Larry Weiler
Keyword(s):  
Lewis Acids ◽  
Electrophilic Cyclization

The allylsilane 3 was synthesized and cyclized with Lewis acids or mercuric trifluoroacetate to give 5 or 6, which were converted into albicanyl acetate (7) and isodrimenin (12).[Formula: see text]

ChemInform Abstract: Highly Enantioselective Atom-Transfer Radical Cyclization Reactions Catalyzed by Chiral Lewis Acids.

ChemInform ◽  
2010 ◽  
Vol 33 (1) ◽  
pp. no-no
Author(s):  
Dan Yang ◽  
Shen Gu ◽  
Yi-Long Yan ◽  
Nian-Yong Zhu ◽  
Kung-Kai Cheung
Keyword(s):  
Lewis Acids ◽  
Radical Cyclization ◽  
Atom Transfer ◽  
Cyclization Reactions ◽  
Atom Transfer Radical Cyclization

The Use of Electrophilic Cyclization for the Preparation of Condensed Heterocycles

Synthesis ◽  
2021 ◽  
Author(s):  
Mikhailo Slivka ◽  
Mikhailo Onysko
Keyword(s):  
Biological Effects ◽  
Electrophilic Cyclization ◽  
Chemical Transformations ◽  
Cyclization Reactions ◽  
Reaction Conditions ◽  
Electrophilic Reaction ◽  
Partially Saturated ◽  
Current State ◽  
Derivatives Of ◽  
Condensed Heterocycles

AbstractCondensed heterocycles are well-known for their excellent biological effects and they are undeniably important compounds in organic chemistry. Electrophilic cyclization reactions are widely used for the synthesis of mono-heterocyclic compounds. This review highlights the utility of electrophilic cyclization reactions as an effective generic tool for the synthesis of various condensed heterocycles containing functional groups that are able to undergo further chemical transformations, such as nucleophilic substitution, elimination, re-cyclization, cleavage, etc. This review describes the reactions of unsaturated derivatives of different heterocycles with various electrophilic agents (halogens, arylsulfanyl chlorides, mineral acids) resulting in annulation of an additional partially saturated heterocycle. The electrophilic reaction conditions, plausible mechanisms and the use of such transformations in organic synthesis are also discussed. The review mainly focuses on research published since 2002 in order to establish the current state of the art in this area. 1 Introduction2 Electrophilic Cyclization Pathways Involving a Nitrogen Nucleo­philic Center3 Electrophilic Cyclization Pathways Involving a Chalcogen Nucleophilic Center3.1 Sulfur Centers3.2 Oxygen Centers3.3 Selenium Centers4 Strategies and Mechanisms5 Conclusion

Iodine/Visible Light Photocatalysis for Activation of Alkynes for Electrophilic Cyclization Reactions

ACS Catalysis ◽  
2017 ◽  
Vol 7 (6) ◽  
pp. 4093-4099 ◽  
Author(s):  
Yuliang Liu ◽  
Bin Wang ◽  
Xiaofeng Qiao ◽  
Chen-Ho Tung ◽  
Yifeng Wang
Keyword(s):  
Visible Light ◽  
Electrophilic Cyclization ◽  
Visible Light Photocatalysis ◽  
Cyclization Reactions
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