alexa A Staudinger-diaza-wittig Tandem Reaction And Its Application To The Synthesis Of 1H-indazoles, 1H-benzoindazoles And 1H-azaindazoles From (het)aryl Azides
ISSN: 2150-3494

Chemical Sciences Journal
Open Access

OMICS International organises 3000+ Global Conferenceseries Events every year across USA, Europe & Asia with support from 1000 more scientific Societies and Publishes 700+ Open Access Journals which contains over 50000 eminent personalities, reputed scientists as editorial board members.

Open Access Journals gaining more Readers and Citations

700 Journals and 15,000,000 Readers Each Journal is getting 25,000+ Readers

This Readership is 10 times more when compared to other Subscription Journals (Source: Google Analytics)

Share This Page

Additional Info

Loading
Loading Please wait..
 

4th European Chemistry Congress
May 11-13, 2017 Barcelona, Spain

Eric Pasquinet
CEA, France
Keynote: Chem Sci J
DOI: 10.4172/2150-3494-C1-007
Abstract
The aza-Wittig reaction is a widely known and used reaction, which consists of the coupling between an iminophosphorane (obtained from the reaction of a trialkylphosphine on an azide) and an unsaturated carbonyl-type compound. In its intramolecular version, the aza-Wittig reaction gives access to many aza-heterocycles from 5- to 7-membered rings. In such processes, the use of N-electrophiles has never been reported. We investigated nitroso compounds as electrophiles to promote the formation of a N=N double bond. In particular, we found that aromatic iminophosphoranes (coming from the reaction between an aromatic azide and a trialkylphosphine) could cyclize onto an ortho benzylic nitroso moiety, leading to a 3H-indazole that isomerized into its more stable 1H analogue. This process can be operated one-pot, without isolation of the intermediate iminophosphorane. This means that, in a single operation starting from an aromatic azide, the targeted 1H-indazole is generated. Various aryl- and hetaryl azides were used to demonstrate the generality of the method, leading to 1H-indazoles, 1H-benzoindazoles and 1H-azaindazoles (scheme 1). The reaction pathway will also be discussed. It involves a mechanism analogous to that reported for the aza-Wittig reaction. Therefore the key transformation of the process was given the name ‘diaza-Wittig’.
Biography

Eric Pasquinet has completed his PhD from the University of Rouen. He has been working for more than 15 years at CEA on synthesis projects, mainly involving nitrogen heterocycles. He has published more than 25 papers and 12 patents.

Email: [email protected]

image PDF   |   image HTML
 

Relevant Topics

Peer Reviewed Journals
 
Make the best use of Scientific Research and information from our 700 + peer reviewed, Open Access Journals
International Conferences 2017-18
 
Meet Inspiring Speakers and Experts at our 3000+ Global Annual Meetings

Contact Us

 
© 2008-2017 OMICS International - Open Access Publisher. Best viewed in Mozilla Firefox | Google Chrome | Above IE 7.0 version
adwords