Home | My Profile | Contact Us
Research Trends Products  |   order gateway  |   author gateway  |   editor gateway  
ID:
Password:
Register | Forgot Password

Author Resources
 Author Gateway
 Article submission guidelines

Editor Resources
 Editor/Referee Gateway

Agents/Distributors
 Regional Subscription Agents/Distributors
 
Trends in Heterocyclic Chemistry   Volumes    Volume 8 
Abstract
Manganese(III)-promoted 4-exo-trig cyclization of enamides to azetidinones
Andrea D’Annibale, Corrado Trogolo
Pages: 95 - 103
Number of pages: 9
Trends in Heterocyclic Chemistry
Volume 8 

Copyright © 2002 Research Trends. All rights reserved

ABSTRACT

The reaction of variously substituted enamides with Mn(OAc)3 dihydrate afforded β-lactamic products in modest to good yields. The success of the reaction depended mostly on the solvent and reaction conditions. The substitution pattern of the enamidic double bond was found to be of primary importance for the outcome and mechanism of the reaction. The formation of azetidin-2-ones was stereoselective, affording lactams with a trans relationship between the substituents at C-3 and C-4. The reaction proved to be diastereoselective when enamides bearing a chiral group on the nitrogen atom were used.

The Mn(III)-based procedure was carried out either in a purely oxidative way, or in a mixed oxidative- fragmentative pathway. In the latter case, only azetidin-2-ones vinylated at C-4 were obtained. In special cases the obtained β-lactams were overoxidizable affording tricyclic products through an aromatic radical substitution.

Buy this Article


 
search


E-Commerce
Buy this article
Buy this volume
Subscribe to this title
Shopping Cart

Quick Links
Login
Search Products
Browse in Alphabetical Order : Journals
Series/Books
Browse by Subject Classification : Journals
Series/Books

Miscellaneous
Ordering Information Ordering Information
Downloadable forms Downloadable Forms