Synthetic Approaches to Guanacastepenes. Enantiospecific Syntheses of BC and AB Ring Systems of Guanacastepenes and Rameswaralide†

2004 ◽  
Vol 6 (2) ◽  
pp. 165-168 ◽  
Author(s):  
A. Srikrishna ◽  
Dattatraya H. Dethe
Keyword(s):  
Ring Systems ◽  
Synthetic Approaches ◽  
Ab Ring

scholarly journals Metal Complexes of Oxadiazole Ligands: An Overview

2019 ◽  
Vol 20 (14) ◽  
pp. 3483 ◽  
Author(s):  
Giovanni Salassa ◽  
Alessio Terenzi
Keyword(s):  
Metal Complexes ◽  
Medicinal Chemistry ◽  
Heterocyclic Ring ◽  
Organic Ligands ◽  
Ring Systems ◽  
General Overview ◽  
Research Fields ◽  
Scientific Disciplines ◽  
Synthetic Approaches

Oxadizoles are heterocyclic ring systems that find application in different scientific disciplines, from medicinal chemistry to optoelectronics. Coordination with metals (especially the transition ones) proved to enhance the intrinsic characteristics of these organic ligands and many metal complexes of oxadiazoles showed attractive characteristics for different research fields. In this review, we provide a general overview on different metal complexes and polymers containing oxadiazole moieties, reporting the principal synthetic approaches adopted for their preparation and showing the variety of applications they found in the last 40 years.

scholarly journals Advances in the Preparation of Fluorinated Isoquinolines: A Decade of Progress

2017 ◽  
Vol 2017 ◽  
pp. 1-15 ◽  
Author(s):  
Joseph C. Sloop
Keyword(s):  
Transition Metal ◽  
Functional Groups ◽  
Synthetic Methods ◽  
Ring Systems ◽  
Heterocyclic Molecules ◽  
The Past ◽  
Ring Assembly ◽  
Metal Catalyzed ◽  
Synthetic Approaches ◽  
Isoquinoline Derivatives

Heterocyclic molecules incorporating fluorinated isoquinoline components are found in many medicinally and agriculturally important bioactive products as well as industrially impactful materials. Within the past decade, a variety of isoquinolinic ring assembly techniques has enabled the introduction of diverse fluorine-containing functionalities which can enhance potential bioactivity and industrial utility. This review examines recent noncatalyzed and transition metal catalyzed synthetic approaches to the assembly of isoquinoline derivatives that are ring-fluorinated and/or result in the incorporation of fluorine-containing functional groups. Specifically, efficient synthetic methods and regioselectivity in the incorporation of functional groups into isoquinoline ring systems are examined.

scholarly journals Synthetic approaches to fumitremorgins. III. Synthesis of optically active pentacyclic ring systems, and their oxidation at ring C.

1989 ◽  
Vol 37 (1) ◽  
pp. 23-32 ◽  
Author(s):  
Masako NAKAGAWA ◽  
Hiroshi FUKUSHIMA ◽  
Tomohiko KAWATE ◽  
Mitsuya HONGU ◽  
Teruaki UNE ◽  
...  
Keyword(s):  
Optically Active ◽  
Ring Systems ◽  
Synthetic Approaches

scholarly journals Synthetic Approaches to Tetracyclic Pyrrole Imidazole Marine Alkaloids

2013 ◽  
Vol 8 (7) ◽  
pp. 1934578X1300800 ◽  
Author(s):  
Takuya Imaoka ◽  
Makoto Iwata ◽  
Takafumi Akimoto ◽  
Kazuo Nagasawa
Keyword(s):  
Natural Products ◽  
Total Synthesis ◽  
Anticancer Activity ◽  
Biological Activities ◽  
Structural Complexity ◽  
Marine Alkaloids ◽  
Ring Systems ◽  
Agonistic Activity ◽  
Synthetic Approaches

Oroidin derived pyrrole imidazole marine alkaloids (PIAs) are attractive targets for synthetic organic chemists because of their structural complexity and diversity as well as their interesting biological activities. A number of efforts have been carried out to develop strategies for the synthesis of these natural products. Members of PIAs ( eg., 2-7) which contain tetracyclic ring systems possessing characteristic cyclic guanidine or urea moieties show significant biological activities including anticancer activity and agonistic activity against the adrenoceptor. In this review investigations of the total synthesis of the representative tetracyclic PIAs dibromophakellin (2) and dibromophakellstatin (3) are described.

Synthetic Approaches to Inorganic Ring Systems

1994 ◽  
Vol 93 (1-4) ◽  
pp. 13-38 ◽  
Author(s):  
Mohammad Shakir ◽  
Herbert W. Roesky
Keyword(s):  
Ring Systems ◽  
Synthetic Approaches

From Toluene to TaxolTM: Chemoenzymatic and Enantiodivergent Routes to the AB-Ring Systems of Taxoids and ent-Taxoids

Synlett ◽  
1998 ◽  
Vol 1998 (8) ◽  
pp. 897-899 ◽  
Author(s):  
Martin G. Banwell ◽  
Penny Darmos ◽  
Malcolm D. McLeod ◽  
David C. R. Hockless
Keyword(s):  
Ring Systems ◽  
Ab Ring

Efficient synthesis and antitumor activity of an enantiomeric pair of the sesbanimide AB-ring systems

1985 ◽  
Vol 26 (38) ◽  
pp. 4639-4642 ◽  
Author(s):  
Fuyuhiko Matsuda ◽  
Motoji Kawasaki ◽  
Shiro Terashima
Keyword(s):  
Antitumor Activity ◽  
Efficient Synthesis ◽  
Ring Systems ◽  
Ab Ring

Synthetic Approaches to Non-Tropane, Bridged, Azapolycyclic Ring Systems Containing Seven-Membered Carbocycles

Synthesis ◽  
2020 ◽  
Vol 53 (01) ◽  
pp. 65-78
Author(s):  
Daniel R. Griffith ◽  
Aaron H. Shoemaker
Keyword(s):  
Building Blocks ◽  
Short Review ◽  
Ring Expansion ◽  
Membered Ring ◽  
Biologically Active ◽  
Ring Systems ◽  
Ring Expansions ◽  
Carbocyclic Rings ◽  
Synthetic Approaches ◽  
Acyclic Precursor

AbstractThis Short Review highlights various synthetic approaches to bridged azabicyclic ring systems containing seven-membered carbocyclic rings. Such ring systems are common to a number of biologically active natural products. The seven-membered ring in such systems is generally formed in one of four ways: 1) cyclization of an acyclic precursor; 2) ring expansion or rearrangement of a different ring size; 3) cycloaddition; and 4) use of a synthetic building block with the seven-membered ring already present. Representative examples of each approach from both total synthesis and methodological studies are discussed, with an emphasis on work publishedin the last twenty years.1 Introduction2 Cyclization Reactions3 Ring Expansions and Rearrangements4 Cycloadditions5 Strategies Involving Seven-Membered Ring Building Blocks6 Conclusion

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