@article {43834,
	title = {Formal [2+1] annulation (Spiro-Cyclopropanation) reaction between sulfur ylides derived from baylis-hillman bromides and arylidene indane-1,3-dione},
	journal = {Chemistryselect},
	volume = {2},
	year = {2017},
	month = {JUL},
	pages = {6159-6162},
	type = {Article},
	abstract = {<p>The sulfonium salts derived from the Baylis-Hillman bromides have been successfully employed for the selective cycloproporanation of arylidene indane-1,3-diones to synthesize densely substituted spiro-cyclopropanes in good to excellent yields (upto 94\%). Products were obtained mostly in 1:1 diastereomeric ratio and were isolated in pure form. Diastereoselectivity has been improved by using suitably substituted starting materials. In this case a formal [2+1] annulation reaction competes over a probable [3+2] cycloaddition reaction. The reaction proceeds through a Michael initiated ring closure process of S-ylides to the activated olefins for the formation of structurally strained spiro-cyclopropanes.</p>},
	doi = {10.1002/slct.201701221},
	author = {Roy, Suparna and Piradhi, Venkatesh}
}
