A Benzannulated [5.3.1] Propellanone Related to the ABC Ring System of TaxolTM

The title compound, (3aα, 10aα)-11,11-dibromo-6-methoxy-2,3,3a, 10a-tetrahydro-1H,4H-3a, 10a-methano-benz[f]azulen-9(10H)-one, C 16 H 16 Br 2 O 2 , is shown to contain a C6-methoxylated aromatic ring and bears some resemblance to the ABC ring system of paclitaxel (Taxol TM ).