The in situ generated arylâalkyl unsymmetrical thiourea obtained by the reaction of an aryl isothiocyanate with an aliphatic secondary amine on treatment with bromine or its equivalent gave exclusively a product having a thioamido guanidino moiety and not the expected Hugerschoff product 2-aminobenzothiazole. A plausible reaction mechanism has been proposed for this unprecedented transformation and the scope has been extended to various substrates.
通过将芳基异
硫氰酸酯与脂肪族二级胺反应得到的原位生成的不对称芳基-烷基
硫脲,在用
溴或其等效物处理后,独占性地产生了具有
硫酰
氨基呱啶部分的产物,而不是预期的Hugerschoff产物
2-氨基苯并噻唑。提出了一种合理的反应机制来解释这一前所未有的转化,并且将适用范围扩展到了各种底物。