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JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
Regio- and Diastereoselective Construction of Spirocyclopenteneoxindoles through Phosphine-Catalyzed [3 + 2] Annulation of Methyleneindolinone with Alkynoate Derivatives.
Journal of Organic Chemistry 2017 October 7
A phosphine-catalyzed [3 + 2] annulation of isatin-derived α,β-unsaturated ketones with alkynoates for the synthesis of cyclopentene spiro-oxindole skeletons has been developed. This reaction afforded the desired products in high to excellent yields (up to 99%) with high regioselectivity and moderate to high diastereoselectivities (up to 20:1). This strategy allows facile diastereoselective preparation of biologically important spiro-(cyclopentene) oxindoles containing three contiguous stereocenters, including the quaternary stereogenic center joining the two rings.
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