Abstract
A new series of chiral organocatalysts was developed by attaching achiral heterocyclic units via a methylene group to (S)-2-hydroxyethylbenzimidazole for the asymmetric Diels–Alder reaction between anthrone enolate and maleimides. While organocatalysts with pyridine, quinoline, and 1,3,4-oxadiazole achiral heterocyclic subunits gave Diels–Alder adducts with an (S,S)-configuration, the organocatalyst with a benzotriazole subunit caused formation of the (R,R)-configuration for the Diels–Alder adducts
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