for the one‐pottransformation of 2‐N‐tosylamino diselenides into benzo[b][1,4]selenazines has been established. The data collected indicate that the six‐membered heterocyclic ring is the result of a [4+2] cycloaddition reaction of a transient electron‐poor o‐iminoselenoquinone, acting as diene, with an electron‐rich alkene, performing as dienophile. The key step of the synthesis is a 1,4‐elimination
建立了一个简单的程序,可以将2- N-甲苯磺酰基二硒化物一锅转化为苯并[ b ] [1,4]硒硒嗪。收集的数据表明,六元杂环是瞬态贫电子的邻亚氨基硒代醌(充当二烯)与富电子的烯烃(充当亲二烯体)的[4 + 2]环加成反应的结果。合成的关键步骤是在硒原子上的硒上进行1,4消除,从而导致杂二烯的生成,这需要催化量的三氟甲磺酸铜(II)才能激活硒-硒键。