The simple primary β-amino alcohol catalyzedDiels-Alderreaction of 3-hydroxy-2-pyridones as dienes with N-substituted maleimides to provide the highly substituted optically active isoquinuclidines as a single diastereomers in excellent enantioselectivities (up to 98%) with excellent chemical yields (up to 95%) was demonstrated. A range of simple β-amino alcohols were synthesized from the corresponding
A new hybrid-type squaramide-fused amino alcohol organocatalyst containing both a Brønsted-basic site and a hydrogen-bonding site showed high catalytic activity in the enantioselective Diels–Alderreactions of 3-hydroxy-2-pyridones with maleimides to afford the chiral 4-hydroxyisoquinuclidines with high regio- and stereoselectivity.