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.