1,2- and 1,5-Stereocontrols in 5-Hexenyl Radical Cyclizations: Cooperative or Antagonist Effect. Confrontation of Experimental Results with MM2 Calculations of Transition States

M. P. Bertrand, I. De Riggi, C. Lesueur, S. Gastaldi, R. Nouguier, C. Jaime, A. Virgili

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Abstract

The cyclofunctionalization of 1,6-dienes 1 and 2 via the addition of tosyl radical allows the analysis of the combined effects of 1,2- and 1,5-stereocontrols on the outcome of 5-hexenyl radical cyclizations. MM2 calculations of transition states agree quite well with the experimental selectivity, i.e., exclusive 1,2-trans control, and predominance of 1,5-cis over 1,5-trans relationship. The addition of TsBr to carbohydrate-derived epimeric dienes 3a and 3b shows that the stereochemistry of the newly formed C—C bond is controlled by the configuration of the C2 center of the radical. 1,5-trans or 1,5-cis selectivity can be achieved depending on the configuration of C2. © 1995, American Chemical Society. All rights reserved.
Original languageEnglish
Pages (from-to)6040-6045
JournalJournal of Organic Chemistry
Volume60
Issue number19
DOIs
Publication statusPublished - 1 Sep 1995

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