Stereoselective synthesis of (±)-18,19-dinor -13βH,14αH-cheilanthane, the most abundant tricyclic compound from petroleums and sediments

Abstract
The syntheses of (±)-18,19-dinor -13βH,14αH-cheilantane (1) and its C-13 epimer (6), from (±)-methyl isocopalate (3)via the key intermediate (5) are described.

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