Permanent URL to this publication: http://dx.doi.org/10.5167/uzh-12661
Mloston, G; Celeda, M; Linden, A; Heimgartner, H (2009). Reaction of 1-azabicyclo[1.1.0]butanes with 2,3-dicyanofumarates; interception of the intermediate zwitterions with methanol. Heterocycles, 77(1):389-400.
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The reaction of 3-phenyl-1-azabicyclo[1.1.0]butane (1c) with 2,3-dicyanofumarates ((E)-5) in dichloromethane at room temperature yields mixtures of cis- and trans-2,3-dicyano-4-phenyl-1-azabicyclo[2.1.1]hexane- 2,3-dicarboxylates (cis,trans-4). The proposed two-step reaction mechanism via a zwitterionic intermediate of type (6) is supported by trapping experiments with methanol: when the reactions of 1-azabicyclo[1.1.0]butanes (1) with dimethyl 2,3-dicyanofumarate ((E)-5a) are carried out in methanol, dimethyl (E)-2-(azetidin-1-yl)-3-cyanobut-2-enedioates (7) are formed as the only products.
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|Item Type:||Journal Article, refereed, original work|
|Communities & Collections:||07 Faculty of Science > Department of Chemistry|
|Deposited On:||14 Mar 2009 15:30|
|Last Modified:||10 Jun 2014 02:53|
|Publisher:||The Japan Institute of Heterocyclic Chemistry|
|Funders:||Rector of the University of Łodz, F. Hoffmann-La Roche AG, Basel|
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