Selective In-Situ Metal Azide Reactions

  • ChemPubSoc Europe Logo
  • Author: Stuart Beardsworth
  • Published Date: 07 March 2017
  • Source / Publisher: Chemistry – A European Journal/Wiley-VCH
  • Copyright: Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim
thumbnail image: Selective In-Situ Metal Azide Reactions

Related Societies

The azide anion is a versatile and very useful reagent in chemical synthesis. Functioning as a nucleophile, it provides access to a variety of nitrogen functionalities after addition to an electrophilic center. In many cases, sodium azide is used due to its availability and relative safety. Only very few other main- or transition-metal azides have been reported, due in part to their instability and explosive nature.


Alexey Sukhorukov, N. D. Zelinsky Institute of Organic Chemistry, Moscow, Russia, and colleagues studied the selective reactions of in-situ generated metal azides on N,N-bis(oxy)enamines. By combining readily generated bis(oxy)enamine substrates with sodium azide and one of a variety of metal salts (including Mg, Cu, Zn, Co, and Ni), the researchers showed that the metal cation selectively alters the mechanism to favor the formation of specific organoazide products.


In all cases, cleavage of the N-silyl ethers in the starting material occurred, but via two different routes. Ionic metal azides attacked the silicon atom directly, producing the conjugated nitrosoalkenes, whereas covalently bound metal azides transferred N3 to a β-carbon through a Lewis acid-assisted substitution reaction. The results show that such in-situ generated metal azide species can be stable and useful reagents in the synthesis of azide products. The chemical properties can be readily tuned by the nature of the metal involved as well as by the N3/M ratio. The method could be used in synthetic routes for precursors of stereochemically complex products, such as unsymmetrically substituted diaminoalcohols, which are difficult to obtain.


 

Article Views: 1959

Sign in Area

Please sign in below

Additional Sign In options

Please note that to comment on an article you must be registered and logged in.
Registration is for free, you may already be registered to receive, e.g., the newsletter. When you register on this website, please ensure you view our terms and conditions. All comments are subject to moderation.

Article Comments - To add a comment please sign in

Bookmark and Share

If you would like to reuse any content, in print or online, from ChemistryViews.org, please contact us first for permission. more


CONNECT:

ChemistryViews.org on Facebook

ChemistryViews.org on Twitter ChemistryViews.org on YouTube ChemistryViews.org on LinkedIn Sign up for our free newsletter


A product of ChemPubSoc Europe (16 European Chemical Societies)and Wiley-VCH