A novel synthetic route to the hexahydrobenzofuran subunit of the avermectins and milbemycins
✍ Scribed by Stephen Hanessian; Pierre Beaulieu; Daniel Dubé
- Publisher
- Elsevier Science
- Year
- 1986
- Tongue
- French
- Weight
- 246 KB
- Volume
- 27
- Category
- Article
- ISSN
- 0040-4039
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✦ Synopsis
Radical-induced intramolecular Michael cyclization of a bromovinyl-type appendage onto a functionalized cyclohexene carboxylic acid derivative produces the corresponding oxahydrindanes which can be transformed into oxahydrindenes (hexahydrobensofurans) related to the title compounds. (-)-Quinic acid is a useful optically active precursor.
📜 SIMILAR VOLUMES
A hexahydrobenzoIABlfuran characteristic of the avermectins and certain milbemycins was synthesized via acid-catalyzed intramolecular addition of a diazoketone to a r-lactone; subsequent transformations led to structures containing much of the functionality and stereochemistry present in the corresp
A highly regio-and stereoselective Diels-Alder reaction between dienophiles of type I and dienes of type I1 (Scheme I ) gives rise to Diels-Alder adducts of type 111. Upon treatment with BF,. Et,O, these adducts are smoothly converted into the corresponding enones (Scheme 6). Under mild acidic condi
Oxidative cyclization of a dihydropyran bearing a pendant alcohol is used to synthesize a spiroketal system of the type found in the avermectins.
A MlchaeCAldol sequence of an enoate-ketone triggered by the action of an aluminum thiophenoxy "ate" complex leads to the oxahydrindene subunit of the avermectins.