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D. A.  Kambale, Thorat, S. S., Pratapure, M. S., Gonnade, R. G., and Kontham, R., ?Lewis acid catalyzed cascade annulation of alkynols with alpha-ketoesters: a facile access to gamma-spiroketal-gamma-lactones?, Chemical Communications, vol. 53, no. 49, pp. 6641-6644, 2017.\par \par D. A.  Kambale, Borade, B. R., and Kontham, R., ?Bismuth(iii)-catalyzed bis-cyclization of propargylic diol-esters: a unified approach for the synthesis of [5,5]- and [6,5]-oxaspirolactones?, Organic & Biomolecular Chemistry, vol. 19, no. 30, pp. 6618-6622, 2021.\par \par D. A.  Kambale, Borade, B. R., Vinodkumar, R., and Kontham, R., ?Divergent synthesis of oxepino-phthalides and [5,5]-oxaspirolactones through [2+2+2]- and [2+3]-annulation of alkynyl alcohols with a-ynone-esters?, Journal of Organic Chemistry, vol. 88, no. 17, pp. 12597-12612, 2023.\par \par }