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Catalytic asymmetric aza Diels–Alder reactions of acylhydrazones with Danishefsky’s dienes have been developed. A chiral zirconium complex derived from zirconium propoxide and 3,3′,6,6′-I 4 BINOL was found to be effective in this reaction, and the desired optically active 2,3-dihydro-4-pyridone derivatives were obtained with high enantioselectivities. Asymmetric formal synthesis of a natural...
A novel zirconium catalyst has been developed for asymmetric aldol reaction of aldehydes with silyl enolates and asymmetric Mannich reactions of imines with silyl enolates. Similar types of catalysts have been successfully used in both reactions, and the desired products were obtained in high yields and high selectivities. For the sense of the chiral induction, reverse enantiofacial selectivities...
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