@inproceedings{paperid:1035434,
author = {Eshghi, Hossein and Rahimizadeh, Mohammad and Attaran Kakhki, Neda and Bakavoli, Mehdi},
title = {Synthesis of new pyrrolizine derivatives via ring annulation under green conditions},
booktitle = {20th Iranian Seminar of Organic Chemistry},
year = {2013},
location = {همدان, IRAN},
keywords = {Pyrrolizine and its derivatives have been attracting growing interest from synthetic chemists for their various and essential biological activities [1;2]. Also; these bicyclic heterocycles are present in naturally occurring alkaloids. On the other hand; bipyrroles are crucial intermediates for the synthesis of substituted porphyrins; expanded porphyrins; porphyrin analogues (dipyrrins; calixpyrroles; chlorins; corroles) and polypyrrolic polymers that are useful in chemistry; physics; biology; medicine and engineering [3;4]. So; bipyrroles with pyrrolizine nucleus make these molecules attractive for scientists [5]. 
Pyrrolizines were; in general; synthesized via multi-step reactions with low yields. However; the growing interest on these molecules led synthetic chemists to find new routes in order to improve reaction conditions. 
In this report; we use an environmentally friendly homogeneous acidic catalyst for a condensation reaction of pyrrole with diketones in the absence of any organic solvent. This reaction revealed a ring annulation resulting in the formation of a bipyrrole moiety bridged via 2;3-dihydro-1H-pyrrolizine through its 1;3-position. The FT-IR; 
1
H-NMR and elemental analysis confirm the structure of compounds.},
}