4b-Aryltetrahydroindeno[1,2-a]indenes by Acid-Catalyzed Trans-annular Cyclization of Benzannulated Cyclooctene Alcohols
SYNLETT(2022)
Abstract
By starting from two simple building blocks, benzannulated cyclooctenones were obtained in three steps. Subsequent Grignard/aryl lithium addition to the ketone yielded the corresponding tertiary alcohols that underwent stereoselective acid-catalyzed transannular cyclization to provide a cis-fused 5/5 bicyclic indanylindane framework exclusively. Subsequent stereoselective nucleophilic addition to the indanyl cation by hydride, water, or electron-rich aromatics furnished the 4b-aryltetrahydroindano[1,2-a]indenes in good to excellent yields (up to 92%) in the trans-C9-C9a form in up to a >99:1 diastereomeric ratio.
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Key words
carbocations, cyclization, diastereoselectivity, metathesis, acid catalysis, indenoindenes
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