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Published in last 50 years
Abstract Chiral heterocyclic ketene N, O-acetals 3 were synthesized by the reaction of ketene mercaptals 2 with (R)-(-)-2-amino-1-butanol.
Chiral dienophiles 1–3 undergo highly exo and diastereoface selective Diels-Alder reactions. The Diels-Alder reactions of 3 are also highly exo selective under Lewis acid catalyzed conditions.