Cyclopenta[c]benzofuran derivatives (5a) and (5b) were synthesized from spirodienone esters (6a) and (6b). respectively; and the utility of these intermediates in acorane-alaskane sesquiterpene synthesis is illustrated by their conversion into(±)-β-acoreno (4a) and (±) and (±)-acorenone (1).
C. Iwata, S. Nakamura, Y. Shinoo, T. Fusaka, M. Kishimoto, H. Uetsuji, N. Maezaki and T. Tanaka, J. Chem. Soc., Chem. Commun., 1984, 781 DOI: 10.1039/C39840000781
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