@article {47633,
	title = {Bismuth(iii)-catalyzed bis-cyclization of propargylic diol-esters: a unified approach for the synthesis of [5,5]- and [6,5]-oxaspirolactones},
	journal = {Organic \& Biomolecular Chemistry},
	volume = {19},
	year = {2021},
	month = {AUG },
	pages = {6618-6622},
	type = {Article},
	abstract = {Herein we disclose an unprecedented intramolecular cascade strategy for the construction of alpha,beta-unsaturated [5,5]- and [6,5]-oxaspirolactones that capitalizes on the pi-electrophilic Lewis acid-catalyzed 5-exo-dig or 6-exo-dig mode of cyclization of propargylic diol esters, followed by dehydration and spirolactonization steps. Moreover, semi-protected substrates also delivered the respective oxaspirolactones with the same ease and in appreciable yields under optimal reaction conditions.},
	issn = {1477-0520},
	doi = {10.1039/d1ob00974e},
	author = {Kambale, Digambar A. and Borade, Balasaheb R. and Kontham, Ravindar}
}
