Thermal [3+2] cycloadditon of aroylketene dithioacetals 1a-e with sodium azide affords novel 4-aroyl-5-methylthio-1H-1,2,3-triazoles 3a-e. The corresponding S,N-acetals 5a-m derived from primary amines react with sodium azide through different pathway involving cyclization of initially formed imidoyl azide intermediates to give novel 1,5-disubstituted tetrazole 7a-m in good yields. The S,N-acetal 5n obtained from malononitrile, however, undergoes cycloaddition on one of the nitrile groups to give a tetrazole 8.
芳基
乙烯二
硫代
乙醛 1a-e 与
叠氮化
钠发生热[3+2]环加成反应,生成新型 4-芳酰基-5-甲
硫基-
1H-1,2,3-三唑 3a-e。由
伯胺衍生的相应 S,N-
缩醛 5a-m 与
叠氮化
钠通过不同的途径(包括最初形成的
咪唑酰
叠氮化物中间体的环化)发生反应,以良好的产率得到新型 1,5-二取代
四氮唑 7a-m。然而,从
丙二腈中得到的 S,N-
缩醛 5n 会与其中一个腈基发生环化反应,生成
四氮唑 8。