Synthesis of Chiral Nopinane‐Annelated Pyrazolo[3,4‐ b ]pyridines From 5‐Aminopyrazoles and Myrtenal
A series of 1‐aryl‐5‐aminopyrazoles was synthesized from 3‐iminobutanenitrile and substituted arylhydrazines under microwave irradiation (115°C–120°C) in ethanol, affording the target compounds in moderate to excellent isolated yields (28%–89%). Subsequently, the synthesized 1‐aryl‐5‐aminopyrazoles were reacted wit...