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DOI: 10.1055/s-2005-870011
A Novel Fragmentation of 7-Azabicyclo[2.2.1]hepta-2,5-dienes: Synthesis of cis-5-Amidino-pyrrolidine-2-acetic Acid Derivatives
Publication History
Publication Date:
13 July 2005 (online)
Abstract
A new fragmentation reaction of 3-bromo-7-azabicyclo[2.2.1]hepta-2,5-diene carboxylic esters with 2-amino or 2-aminomethyl anilines is described. It leads to cis-5-(benzimidazol-2-yl)- or cis-5-(3,4-dihydroquinazolin-2-yl)-pyrroline-2-acetic acid esters. Substituents on the nitrogen atoms or in the aromatic ring are tolerated as long as they do not strongly reduce the nucleophilicity of the nitrogen atoms. The primary reaction products are not very stable but hydrogenation of the pyrroline and/or cleavage of the ester give products that are suitable for subsequent structural modifications, particularly ones that are interesting for combinatorial syntheses.
Key words
amines - ring closure - ring opening - heterocycles - nucleophilic additions
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References
Present address: CarboGen AG, Neulandweg 5, 5502 Hunzenschwil, Switzerland.
2Present address: Institut für Pharmazie und Lebensmittelchemie, Universität Würzburg, Sanderring 2, 97070 Würzburg, Germany.
26Heller, E.; Kurz, G. unpublished experiments.