作者:P. Giori、A. C. Veronese、C. B. Vicentini、M. Guarneri
DOI:10.1002/jhet.5570220434
日期:1985.7
Aryl and t-butylhydrazines react with 2-cyano-3-ethoxythiocrotonamide affording 2-cyano-3-aryl-t-butylhy-drazinothiocrotonamides. These intermediates can be easily cyclized to 4-thiocarbamoyl-5-aminopyrazoles by heating a few minutes in a strong base. Alkylhydrazines react with 2-cyano-3-ethoxythiocrotonamide yielding directly a mixture of the cyclized compounds 4-cyano-5-aminopyrazoles and 4-thio
芳基和叔丁基肼与2-氰基-3-乙氧基硫代巴豆酰胺反应,得到2-氰基-3-芳基-叔丁基hy-drazinothiocrotonamides。通过在强碱中加热几分钟,这些中间体可以轻松地环化为4-硫代氨基甲酰基-5-氨基吡唑。烷基肼与2-氰基-3-乙氧基硫代巴豆酰胺反应,直接生成环化化合物4-氰基-5-氨基吡唑和4-硫代氨基甲酰基-5-氨基吡唑的混合物。