Construction of highly enantioenriched spirocyclopentaneoxindoles containing four consecutive stereocenters via thiourea-catalyzed asymmetric Michael-Henry cascade reactions.
BEILSTEIN JOURNAL OF ORGANIC CHEMISTRY(2017)
Abstract
The thiourea-catalyzed asymmetric synthesis of highly enantioenriched spirocyclopentaneoxindoles containing chiral amide functional groups using simple 3-substituted oxindoles and nitrovinylacetamide as starting materials was achieved successfully. This protocol features operational simplicity, high atom economy, and high catalytic asymmetry, thus representing a versatile approach to the synthesis of highly enantioenriched spirocyclopentaneoxindoles.
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Key words
asymmetric synthesis,four consecutive stereocenters,Michael-Henry cascade reactions,spirocyclopentaneoxindoles,thioureas
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