A tetrahydropentaleno[1,6a-a]naphthalen-4(2H)-one of defined relative stereochemistry for use towards Agariblazeispirol C

Kennedy, Alan R. and Kerr, William J. and Paterson, Laura C. and Sutherland, Andrew (2010) A tetrahydropentaleno[1,6a-a]naphthalen-4(2H)-one of defined relative stereochemistry for use towards Agariblazeispirol C. Acta Crystallographica Section C: Crystal Structure Communications, 66. pp. 473-474. ISSN 0108-2701 (https://doi.org/10.1107/S0108270110031781)

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Abstract

Towards the synthesis of the novel natural product Agariblazeispirol C, (5aR*,11bR*)-9-methoxy-3,8,11b-trimethyl-5,6,7,11b-tetrahydro-1H-pentaleno[1,6a-a]naphthalen-4(2H)-one, C20H24O2, has been prepared at a key stage of the preparative programme. The structure shows the desired stereochemical outcome of the central cyclization protocol, viz. a syn-relationship between the aliphatic methyl group on the 11b-position and the methylene group on the 5a-position [C-C-C-C = -34.57 (18)degrees].