Synthesis of <i>o</i>-Sulfamidotriazobenzenes from 1,1‘-Sulfonylbis(benzotriazole)

Easily accessible 1,1‘-sulfonylbis(benzotriazole) (Bt2SO2, 1) reacts with secondary amines at room temperature to afford (i) the corresponding o-sulfamidotriazobenzenes 2a−d (53−75%) via concurrent substitution of the first and ring opening of the second benzotriazolyl group and (ii) N-sulfonylbenzotriazoles 3b,c,e,f (7−73%). 1-(Morpholine-4-sulfonyl)-1H-benzotriazole 3c reacts with piperidine, pyrolidine, and N-methylpiperazine under microwave irradiation (120 W) at 120 °C for 10 min to give the unsymmetrical sulfamides 4a−c (80−90%).