Base-promoted synthesis of dibenzoxazepinamines and quinazolinimines under metal-free conditions

Abstract

An interesting base-promoted protocol for the synthesis of dibenzo[b,f][1,4]oxazepin-11-amines and quinazolinimines has been developed. Started from commercially available 2-fluorobenzonitriles, 2-aminophenols and 2-aminoethanol, good to excellent yields of the corresponding heterocycles can be achieved. Notably, only K₃PO₄ or K₂CO₃ was required as the promoter here and the reaction can be easily performed on a large scale.