In basic medium arylthiols displace bromo and iodo groups activated by nitro substituents in 5(4)-halo-4(5)- nitroimidazoles . The bromo compounds are slightly more reactive than the iodo analogues. Substituents at C5 are more readily displaced than those at C4. Methylsulfonyl groups, similarly activated by an adjacent nitro substituent, are displaced by a variety of nucleophiles. The imidazolethiol products are readily oxidized to the sulfones.
在碱性介质中,芳基硫醇取代了 5(4)- 卤-4(5)- 硝基咪唑中由硝基取代基活化的溴基和碘基。溴代化合物的活性略高于碘代类似物。位于 C5 的取代基比位于 C4 的取代基更容易被取代。甲基磺酰基也同样被邻近的硝基取代基激活,并被各种亲核剂置换。咪唑硫醇产物很容易被氧化成砜。