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DOI: 10.1055/s-0033-1339031
The Preparation of Stereoisomeric Tricyclo[4.2.1.02,5]nona-7-ene-3,4-dicarboximides and Anhydrides: Literature Corrections and New Products
Publication History
Received: 05 March 2014
Accepted after revision: 08 April 2014
Publication Date:
20 May 2014 (online)
Abstract
The bis-homo Diels–Alder reactions of maleimide and N-methylmaleimide with quadricyclane are shown to produce mixtures containing both the exo,anti- and exo,syn-tricyclo-[4.2.1.02,5]nona-7-ene-3,4-dicarboximides, whereas the isomeric endo,anti-adducts are available from the reaction of cyclopentadiene with the appropriate cyclobutene-3,4-dicarboximides. The related reaction of quadricyclane with maleic anhydride had been erroneously reported to form single adducts; our work shows that two stereoisomers are actually formed and these have been chemically related to the maleimide and N-methylmaleimide adducts. The proton chemical shifts of the adduct formed by reaction of cyclobutene-3,4-dicarboxylic anhydride with cyclopentadiene have also been miss-assigned. Preparation of [3] and [5] polynorbornane scaffolds with terminal succinimides have been effected by coupling the stereoisomeric adducts at the norbornene π-bond by using 2,5-bis(trifluoromethyl)-1,3,4-oxadiazole and bisepoxide. The spacer shapes and dimensions have been determined by molecular modelling.
Supporting Information
- for this article is available online at http://www.thieme-connect.com/products/ejournals/journal/ 10.1055/s-00000083.
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