A facile synthesis of novel 1,2‐diazepino[3,4‐<i>b</i>]quinoxalines by a 1,3‐dipolar cycloaddition reaction

Abstract

Abstract The 1,3‐dipolar cycloaddition reaction of the quinoxaline 4‐oxides 4a,b with 2‐chloroacrylonitrile gave the 2,3‐dihydro‐1 H ‐1,2‐diazepino[3,4‐ b ]quinoxalines 5a,b , respectively, which were converted into the 2,3,4,6‐tetrahydro‐1 H ‐1,2‐diazepino[3,4‐ b ]quinoxalines 7a,b and 8a,b , respectively.