Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 55, Issue 39, Pages 12104-12108Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201606947
Keywords
chromans; domino reactions; organocatalysis; oxa-Michael addition; para-quinone methides
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Funding
- European Research Council (ERC) [320493]
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An asymmetric organocatalytic domino oxa-Michael/1,6-addition reaction of ortho-hydroxyphenyl-substituted para-quinone methides and isatin-derived enoates has been developed. In the presence of 5 mol% of a bifunctional thiourea organocatalyst, this scalable domino reaction affords 4-phenyl-substituted chromans bearing spiro-connected oxindole scaffolds and three adjacent stereogenic centers in good to excellent yields (up to 98%) and with very high stereoselectivities (up to > 20:1 d.r., > 99 % ee).
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