Unusual oxidative free-radical additions of 1,3-dicarbonyl compounds to benzonorbornadiene and oxabenzonorbornadiene

Benzonorbornadiene and oxabenzonorbornadiene were reacted with dimedone and acetylacetone in the presence of Mn(OAc) 3 and Cu(OAc) 2. The reaction of benzonorbornadiene with dimedone gave the dihydrofuran addition product, whereas the reaction with acetylacetone produced, in addition to the dihydrof...

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Bibliographic Details
Published in:Tetrahedron letters 2005-09, Vol.46 (37), p.6227-6230
Main Authors: Çalışkan, Raşit, Pekel, Tarık, Watson, William H., Balci, Metin
Format: Article
Language:English
Subjects:
Benzonorbornadiene
Cycloaddition
Free radicals
Manganese triacetate
Oxabenzonorbornadiene
Rearrangement
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Summary:Benzonorbornadiene and oxabenzonorbornadiene were reacted with dimedone and acetylacetone in the presence of Mn(OAc) 3 and Cu(OAc) 2. The reaction of benzonorbornadiene with dimedone gave the dihydrofuran addition product, whereas the reaction with acetylacetone produced, in addition to the dihydrofuran derivative, a rearranged product. On the other hand, oxanorbornadiene gave unusual products such as the cyclopropanated compound and the product arising from the addition of two moles of dimedone. The mechanism of formation of the products is discussed.
ISSN:0040-4039
1873-3581
DOI:10.1016/j.tetlet.2005.07.051