An enantioselective intramolecular heterocyclization with in situ generated 3-hydroxyisoindolinone-derived
N-acyliminium ions has been successfully accomplished. In the presence of a catalytic
amount of a chiral phosphoric acid, functionalized 3,3-disubstituted isoindolinones
bearing N-acyl-N,O-acetal moieties were obtained with good yields and a high level of stereocontrol
(up to 98:2 er). This efficient method proceeds under mild conditions and exhibits
broad scope with respect to both 3-hydroxyisoindolinones and hydroxyl partners.
Key words
N-acyliminium ion - chiral phosphoric acid - 3,3-disubstituted isoindolinones -
N-acyl-
N,
O-acetal - enantioselective