Synthesis 2013; 45(16): 2294-2304
DOI: 10.1055/s-0033-1338492
paper
© Georg Thieme Verlag Stuttgart · New York

Synthesis of Functionalized Pyrrolizidines/Pyrrolidines Incorporating a Spirooxindole Motif through [3+2] Cycloaddition

Yaghoub Sarrafi*
a   Department of Organic Chemistry, Faculty of Chemistry, University of Mazandaran, Babolsar, 47416, Iran   Fax: +98(112)5342350   Email: ysarrafi@umz.ac.ir
,
Marzieh Sadatshahabi
a   Department of Organic Chemistry, Faculty of Chemistry, University of Mazandaran, Babolsar, 47416, Iran   Fax: +98(112)5342350   Email: ysarrafi@umz.ac.ir
,
Mahshid Hamzehloueian
b   Department of Chemistry, Jouybar Branch, Islamic Azad University, Jouybar, Iran
,
Kamal Alimohammadi
c   Department of Chemistry, Dr. Shariati Branch, Farhangian University, Sari, Iran
,
Mahgol Tajbakhsh
a   Department of Organic Chemistry, Faculty of Chemistry, University of Mazandaran, Babolsar, 47416, Iran   Fax: +98(112)5342350   Email: ysarrafi@umz.ac.ir
› Author Affiliations
Further Information

Publication History

Received: 26 February 2013

Accepted after revision: 20 May 2013

Publication Date:
09 July 2013 (online)


Abstract

Dimethyl 2-(aryloxy)fumarates and dimethyl 2-(alkyl- or arylthio)fumarates are shown to be efficient dipolarophiles in 1,3-dipolar cycloaddition reaction with azomethine ylides, which are generated by the reaction of isatin with the secondary amino ­acids proline or sarcosine. In these reactions, dimethyl 2-(alkyl- or arylthio)fumarates afforded spirooxindolopyrrolizidines or -pyrrolidines in high yields with excellent regioselectivities, while dimethyl 2-(aryloxy)fumarates produced mixtures of regioisomers. DFT calculations at the B3LYP/6-31G(d,p) level were consistent with the observed results. Tri- and tetracyclic compounds were obtained through regio- and stereoselective intramolecular cycloaddition of O-vinylic salicylaldehyde with secondary amino acids.

Supporting Information