SCHEDULED MAINTENANCE
4,8-Dimethyl-1,4,5,6,7,7a-hexahydroinden-2-one (7), obtained by Wichterle annelation of 2,6-dimethylcyclohexanone, was converted into 1-hydroxy-5,8-dimethyl-1,7,8,9-tetrahydro-3H-2-benzopyran-3-one (26). Treatment of compound (26) with 3-lithiofuran afforded pyroangolensolide (1) together with its diastereoisomer (4).
T. Tokoroyama, Y. Fukuyama and Y. Kotsuji, J. Chem. Soc., Perkin Trans. 1, 1988, 445 DOI: 10.1039/P19880000445
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