Journal
ORGANIC CHEMISTRY FRONTIERS
Volume 2, Issue 2, Pages 110-113Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4qo00299g
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Funding
- National Natural Science Foundation of China [21302020, 21342009, 21472019]
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A squaramide-catalyzed Michael-Michael-aldol cascade sequence of three readily accessible substrates (1,3-dicarbonyl compound, nitroalkene and methyleneindolinone) was developed. The reactions led to a series of enantioenriched spirocyclohexane oxindoles bearing six contiguous stereocenters in good yields (up to 85%) and with excellent stereoselectivities (>20 : 1 dr, >99% ee).
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