Atroposelective Construction of Naphthylpyrazoles by Chiral Phosphoric Acid Catalyzed Enantioselective Cross‐Coupling of Pyrazoles with Naphthoquinone Esters
The asymmetric reaction of 5-aminopyrazoles with naphthoquinone esters has been established with a chiral phosphoric acid catalyst, providing a wide range of axially chiral naphthylpyrazole derivatives in moderate to excellent yields (up to 99 % yield) with up to 99 % ee. A preliminary mechanistic investigation was conducted.