Simple syntheses of the basic skeletons of some naturally occurring terpenes possessing lactone moieties are described. Thermolysis of 1,2-dihydro-6-methoxybenzocyclobuten-1-yl but-3-enoate (4) in a sealed tube at 180–200 °C afforded the cyclised lactone (5) in moderate yield. On similar treatment, the benzocyclobutenes (11) and (14) gave the corresponding fused lactones (12) and (15) respectively.
T. Kametani, T. Honda, H. Matsumoto and K. Fukumoto, J. Chem. Soc., Perkin Trans. 1, 1981, 1383 DOI: 10.1039/P19810001383
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