Various 2,2′-spirobiindane-1,3-dione derivatives which are useful precursors for the synthesis of unsymmetrical benzoannelated fenestranes are reported via [2+2+2] and [4+2] cycloaddition reactions as key steps.
S. Kotha and E. Manivannan, J. Chem. Soc., Perkin Trans. 1, 2001, 2543 DOI: 10.1039/B106280H
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