Methyl 3-(propan-2-ylidene)-3a,9a-dihydro-3H-cyclopenta[a]azulene-9-carboxylate (2) was synthesized in moderate yield via an [8 + 2] cycloaddition of methyl 2-oxo-2H-cyclohepta[b]furan-3-carboxylate (1) with 6,6-dimethylfulvene. The resulting compound was characterized by 1H and 13C NMR spectroscopy, high-resolution mass spectrometry, and single-crystal X-ray diffraction analysis.
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Yoshida et al. (2026) studied this question.
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