Journal
ORGANIC & BIOMOLECULAR CHEMISTRY
Volume 21, Issue 3, Pages 489-493Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d2ob02179j
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The highly enantioselective aza-Friedel-Crafts reaction of cyclic-ketimines and naphthols/phenols has been achieved using a chiral phosphoric acid catalyst. Various chiral aminonaphthols with a quaternary stereocenter were obtained with high yields and excellent enantioselectivity. The synthetic utility of the obtained products was demonstrated through efficient transformations.
The enantioselective aza-Friedel-Crafts reaction is one of the most straightforward and efficient strategies for constructing a new carbon-carbon bond bearing quaternary stereocenter in organic synthesis, but the catalytic asymmetric aza-Friedel-Crafts reaction of naphthols/phenols with cyclic-ketimines attached to a neutral functional group remains still relatively unexplored. Herein, a highly enantioselective aza-Friedel-Crafts reaction of cyclic-ketimines and naphthols/phenols has been realized using a chiral phosphoric acid catalyst. A variety of chiral aminonaphthols (chiral indolin-3-ones) containing a quaternary stereocenter at the C2 position were obtained with excellent outcomes (up to 97% yield, 98% ee). Moreover, the synthetic utility of the enantiomerically enriched chiral aminonaphthols was demonstrated in some efficient transformations. According to the experimental results, a possible transition state model has been proposed to rationalize the origin of asymmetric induction.
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