Journal
TETRAHEDRON
Volume 68, Issue 19, Pages 3717-3724Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.tet.2012.03.024
Keywords
Cyclization; Endoperoxides; Hydroperoxides; Hydroperoxysilylation; Plakortolides
Categories
Funding
- French Ministere de la Recherche et de l'Enseignement Superieur
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Our efforts in construction the 1,2-dioxane ring of plakortolides through two approaches are described. The first one involved as a key step an acid catalyzed 6-endo ring closure of beta-hydroperoxy trans-epoxides directed by a vinyl group adjacent to the epoxide function. By this route, an advanced intermediate of plakortolides was obtained in six steps and 35% overall yield. The second approach featured a 1,2-dioxane ring forming by a double opening of bis-epoxides by ethereal hydrogen peroxide. This reaction did not proceed in the expected sense and exclusive formation of hydroperoxy tetrahydropyran derivatives was observed via a tandem oxacyclization-hydroperoxidation sequence. (C) 2012 Elsevier Ltd. All rights reserved.
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