@article {48722,
	title = {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 = {Journal of Organic Chemistry},
	volume = {88},
	year = {2023},
	month = {AUG },
	pages = {12597-12612},
	type = {Article},
	abstract = {<p>
	Unmasking the synthetic potential of alkyne functional group of alkynyl alcohols as surrogates of carbonyl compounds, herein we present the first Bronsted acid (TfOH)-catalyzed [2 + 2 + 2]-annulation of 4-pentyn-1-ols (possessing terminal alkyne) with a-ynone-esters to access tricyclic tetrahydro-oxepino-phthalides. Besides, an unprecedented synthesis of a-acetoaryl or a-alkynyl [5,5]-oxaspirolactones has been demonstrated by employing 4-pentyn-1-ols (possessing an internal alkyne) as an annulation partner, which proceeds through a divergent [2 + 3]-annulation pathway.</p>
},
	issn = {0022-3263},
	doi = {10.1021/acs.joc.3c01301},
	author = {Kambale, Digambar A. and Borade, Balasaheb R. and Vinodkumar, Ramavath and Kontham, Ravindar}
}
@article {49561,
	title = {Divergent access to α-carbonyl-α'-vinyl sulfoxonium ylides and polysubstituted furans from β-ketosulfoxonium ylides and ynone-esters},
	journal = {Journal of Organic Chemistry},
	volume = {90},
	year = {2025},
	month = {APR},
	pages = {6186-6207},
	type = {Article},
	abstract = {<p>
	Here, we describe the synthesis of novel alpha-carbonyl-alpha {\textquoteleft}-vinyl sulfoxonium ylides under ambient, catalyst-free, and additive-free conditions, demonstrating broad substrate scope and scalability using beta-ketosulfoxonium ylides and alpha-ynone-esters. Furthermore, these ylides serve as versatile intermediates for the synthesis of highly substituted furans via Br \&amp; oslash;nsted acid (p-TsOH) catalysis at 130 degrees C. This approach offers key advantages, including wide substrate compatibility, divergent product formation from common precursors, gram-scale feasibility, and good to excellent yields.</p>
},
	issn = {0022-3263},
	doi = {10.1021/acs.joc.5c00245},
	author = {Ingale, Sudhir R. and Sahu, Manas Ranjan and Borade, Balasaheb R. and Gamidi, Rama Krishna and Kontham, Ravindar}
}
