Synlett 2014; 25(2): 229-232
DOI: 10.1055/s-0033-1340280
letter
© Georg Thieme Verlag Stuttgart · New York

Cycloaddition Reactions of N-Benzotriazolylketene as a Heteroarylketene: A Practical Approach to the Synthesis of Novel Azetidinones

Fatemeh Zigheimat
a   Department of Chemistry, Shahid Bahonar University of Kerman, 76169, Kerman, Iran   Fax: +98(341)3222033   Email: mrislami@uk.ac.ir
,
Mohammad Reza Islami*
a   Department of Chemistry, Shahid Bahonar University of Kerman, 76169, Kerman, Iran   Fax: +98(341)3222033   Email: mrislami@uk.ac.ir
,
Farahnaz Nourmohammadian
b   Department of Organic Colorants, Institute for Color Science and Technology, 654-16765, Tehran, Iran
› Author Affiliations
Further Information

Publication History

Received: 01 October 2013

Accepted after revision: 14 October 2013

Publication Date:
02 December 2013 (online)


Abstract

A series of novel functionalized azetidinones containing the benzotriazole moiety were synthesized stereoselectively by a ­reaction of benzotriazolylacetic acid, aromatic amines, and ­Mukaiyama’s reagent in the presence of triethylamine in dichloromethane at ambient temperature. This transformation generates a four-membered lactam and presumably proceeds via in situ generation of benzotriazolylketene as a heteroarylketene. In contrast to the products obtained from the reaction of pyrrolylketene with imines in which cis-azetidinones were formed as major products, the generated benzotriazolylyketene reacted with imines forming the trans-lactams as major products.

Supporting Information