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Chiral phosphoric acid-catalyzed enantioselective aza-Friedel–Crafts reaction of naphthols and electron-rich phenols with 2-aryl-3H-indol-3-ones†
Tao Ma,Yonghui He,Xiu-Xiu Qiao,Chang-Peng Zou,Xi-Xi Wu,Ganpeng Li,Xiao-Jing Zhao
Organic & Biomolecular Chemistry Pub Date : 12/08/2022 00:00:00 , DOI:10.1039/D2OB02179J
Abstract

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.

Graphical abstract: Chiral phosphoric acid-catalyzed enantioselective aza-Friedel–Crafts reaction of naphthols and electron-rich phenols with 2-aryl-3H-indol-3-ones
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