Cycloaddition of Sodium Azide to Polarized Ketene<i>S,S</i>- and<i>S,N</i>-Acetals: Synthesis of Novel Substituted Triazole and Tetrazole Derivatives
作者:R. T. Chakrasali、H. Ila、H. Junjappa
DOI:10.1055/s-1988-27604
日期:——
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。