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Diastereo- and enantioselective direct vinylogous Michael addition of gamma-substituted butenolides to 2-enoylpyridines catalyzed by chiral bifunctional amine-squaramides

Update time: 06/24/2016

The diastereo- and enantioselective direct vinylogous Michael addition reaction of gamma-substituted butenolides to 2-enoylpyridines has been achieved. A range of gamma,gamma-disubstituted butenolide derivatives, bearing two consecutive tri- and tetrasubstituted stereogenic centers, were readily obtained in good yields with excellent stereoselectivities (up to >99 : 1 dr and >99% ee).