scholarly journals Construction of the [6-7-5-5] tetracyclic core of all the carbocyclic frameworks of yuzurimine-type alkaloids

2015 ◽  
Vol 51 (58) ◽  
pp. 11568-11571 ◽  
Author(s):  
Ichiro Hayakawa ◽  
Keisuke Niida ◽  
Hideo Kigoshi
Keyword(s):  
Wittig Reaction ◽  
Intramolecular Wittig Reaction ◽  
Tetracyclic Core ◽  
Key Steps

Construction of the [6-7-5-5] tetracarbocyclic core of yuzurimine-type alkaloids was achieved by using a unique in situ intramolecular Wittig reaction and Sm-mediated cyclization as key steps.

scholarly journals Stereoselective Synthesis of Tetraalkyl Cyclobutene-1,2,3,4-tetracarboxylates. Synthesis of Tetraalkyl (Z,Z)-Buta-1,3-diene-1,2,3,4-tetracarboxylates

1999 ◽  
Vol 23 (8) ◽  
pp. 512-513
Author(s):  
Issa Yavari ◽  
Farahnaz Nourmohammadian
Keyword(s):  
Ring Opening ◽  
Wittig Reaction ◽  
Stereoselective Synthesis ◽  
Intramolecular Wittig Reaction ◽  
Ring Opening Reactions ◽  
Boiling Toluene

Tetraalkyl cyclobutene-1,2,3,4-tetracarboxylates, prepared by intramolecular Wittig reaction between a vinylphosphonium salt and diethyl 2-oxobutanedioate, undergo electrocyclic ring-opening reactions, in boiling toluene, to produce highly electron-deficient 1,3-dienes.

ChemInform Abstract: SYNTHESIS OF HETEROCYCLES BY AN INTRAMOLECULAR WITTIG REACTION

1980 ◽  
Vol 11 (49) ◽  
Author(s):  
K. NICKISCH ◽  
W. KLOSE ◽  
E. NORDHOFF ◽  
F. BOHLMANN
Keyword(s):  
Wittig Reaction ◽  
Intramolecular Wittig Reaction

scholarly journals Methionine-stabilized nonclassical growth within self-assembled de novo gold nanoparticles in conjunction with secondary nucleation inhibition

2021 ◽  
Author(s):  
Jitendra Sahu ◽  
Shahbaz Lone ◽  
Kalyan Sadhu
Keyword(s):  
Self Assembly ◽  
De Novo ◽  
Noble Metal Nanoparticles ◽  
Secondary Nucleation ◽  
Unique Case ◽  
Primary Particles ◽  
Growth Reaction ◽  
Aurophilic Interaction ◽  
Key Steps

Abstract The key steps for seed mediated growth of noble metal nanoparticles involve primary and secondary nucleation, which depends upon the energy barrier and ligand supersaturation standards of the medium. Herein we report the unique case of methionine (Met) controlled growth reaction, which rather proceeds via impeding secondary nucleation in presence of citrate stabilized gold nanoparticle (AuNP). The interaction between freshly generated Au+ and thioether group of Met in the medium restricts the secondary nucleation process involving further Au+ reduction. This incomplete conversion of Au+ results in a significant enhancement of the zeta (ζ) potential even at low concentration of Met. Furthermore, the aurophilic interaction of Au+ controls the self-assembly process of the in situ generated emissive nucleated particles. Nucleation of primary particles on seed surface, their segregation and time dependent conversion to larger particles within self-assembly confirm the nonclassical growth, which has further been explored with Met containing bio-inspired peptides.

Synthesis of 2-Chromanone-fused [3.2.0] Bicycles through a Phosphine-mediated Tandem [3+2] Cyclization/Intramolecular Wittig Reaction

2021 ◽  
Author(s):  
Junfeng Fu ◽  
Ingrid Rakielle Tsapy Takia ◽  
Peng Chen ◽  
Wei Liu ◽  
Chengjun Jiang ◽  
...  
Keyword(s):  
Wittig Reaction ◽  
High Efficiency ◽  
Intramolecular Wittig Reaction ◽  
Tandem Process ◽  
High Yields

A phosphine-mediated tandem [3+2] cyclization/intramolecular Wittig reaction of 3-aroylcoumarin with alkynone is described. The high efficiency of tandem process allows the synthesis of 2-chromanone-fused bicyclo[3.2.0]heptenones in moderate to high yields...

Strategic Exploitation of the Wittig Reaction: Facile Synthesis of Heteroaromatics and Multifunctional Olefins

Synlett ◽  
2018 ◽  
Vol 29 (20) ◽  
pp. 2608-2622 ◽  
Author(s):  
Wenwei Lin ◽  
Praneeth Karanam ◽  
Ganapuram Reddy
Keyword(s):  
Wittig Reaction ◽  
Coumarin Derivatives ◽  
Facile Synthesis ◽  
Diversity Oriented Synthesis ◽  
New Methods ◽  
Intramolecular Wittig Reaction ◽  
New Synthesis ◽  
Wide Range ◽  
Industrial Level ◽  
New Strategies

In this account, our group’s efforts towards exploring new substrates as precursors for the Wittig reaction have been discussed. Several new strategies developed by our group for the generation of requisite ylides for the Wittig reaction are highlighted. The idea behind the development of some chemoselective and diversity-oriented strategies are discussed in detail in a progressive manner. These strategies encompass a wide range of substrates that are employed for the synthesis of an array of heterocycles and multifunctional olefins and present a huge scope for their application on an industrial level.1 Introduction2 Development of New Methods to Effect Intramolecular Wittig Reaction3 Development of a Catalytic Wittig Reaction4 New Synthesis of Bis-Heteroarenes5 Direct β-Acylation of 2-Arylidene-1,3-indandiones6 Doubly Chemoselective Protocol for the Diversity-Oriented Synthesis of Coumarin Derivatives7 Conclusion

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