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Volumn 350, Issue 3, 2008, Pages 477-481

Unusual totally selective cyclodimerization of epoxides: Synthesis of a pair of diastereoisomers of enantiopure 2,5-disubstituted-1,4-dioxanes with C2 symmetry

Author keywords

Amino epoxides; Diastereoselectivity; Dimerization; Dioxanes; Enantiopurity

Indexed keywords


EID: 53849129569     PISSN: 16154150     EISSN: 15213897     Source Type: Journal    
DOI: 10.1002/adsc.200700486     Document Type: Article
Times cited : (16)

References (47)
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    • CCDC 654081 (1b) contains the supplementary crystallographic data for this paper. They can be obtained free of charge via www.ccdc.cam.ac.uk/data_request/cif (or the Cambridge Data Centre, 12, Union Road. Cambridge CB21EZ, UK: fax: (+44)-1223-336-033; or deposit@ccdc.cam.ac.uk.
    • CCDC 654081 (1b) contains the supplementary crystallographic data for this paper. They can be obtained free of charge via www.ccdc.cam.ac.uk/data_request/cif (or the Cambridge Data Centre, 12, Union Road. Cambridge CB21EZ, UK: fax: (+44)-1223-336-033; or deposit@ccdc.cam.ac.uk.
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    • For clarity, only some relevant atoms are labelled
    • For clarity, only some relevant atoms are labelled.
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    • The coordination of the Lewis acid with the oxygen of the epoxide is favoured in comparison with the nitrogen of the dibenzylamino group due to steric hindrance of the dibenzylamino group, and it has previously been observed in other ring openings of amino epoxides 3 or 4: see ref, 18
    • [18].
  • 46
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    • The synthesis of a mixture of products when the reaction was performed under the same reaction conditions, but using a tertiary amine (i-Pr 2NEt) instead of i-Pr2NH, could support the existence of this equilibrium, due to the coordination of a tertiary amine with a Lewis acid is most difficult than a secondary amine
    • 2NH, could support the existence of this equilibrium, due to the coordination of a tertiary amine with a Lewis acid is most difficult than a secondary amine.
  • 47
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    • A ring-opening of aziridinium 6 at C-3·could be also possible. However the obtained intermediate would allow access to a 7-membered cycle, which it is disfavoured with respect to the formation of the 6-membered cycle such as dioxane. So, the hypothetical formation of this intermediate would be reversible and it would be newly transformed into intermediates 6 and 7.
    • A ring-opening of aziridinium 6 at C-3·could be also possible. However the obtained intermediate would allow access to a 7-membered cycle, which it is disfavoured with respect to the formation of the 6-membered cycle such as dioxane. So, the hypothetical formation of this intermediate would be reversible and it would be newly transformed into intermediates 6 and 7.


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