It′s just a phase: The title reaction sequence of para‐quinone methides (p‐QMs) has been developed with malonates under phase‐transfer catalysis. The reaction also offers an alternative route to asymmetric construction of diarylmethine stereocenters in excellent enantioselectivities and high yields.
Divergent route: a direct C-C bond-forming approach to the key aryl-substituted all-carbon quaternary stereogenic center present in bioactive hydrodibenzofuran alkaloids has been discovered. This approach involves an unprecedented organocatalytic enantioselective Michael addition of α-cyanoketones with acrylates and was used in a novel and divergent synthetic strategy for the title compounds in asymmetric fashion.
It′s just a phase: The title reaction sequence of para‐quinone methides (p‐QMs) has been developed with malonates under phase‐transfer catalysis. The reaction also offers an alternative route to asymmetric construction of diarylmethine stereocenters in excellent enantioselectivities and high yields.
A catalytic enantioselective synthetic strategy for the aryl-substituted all-carbon quaternary stereocenters of bioactive hydrodibenzofuran alkaloids was achieved by the Michael addition reaction of α-cyano ketones and acrylates using a chiral tertiary amine-thiourea catalyst. This method can tolerate steric bulkiness and multiple functional groups, and 32 Michael adducts were prepared in good to excellent yields with
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