A facile synthesis of 3,5-diaminopyrazole-4-carbothioamides and 3,5-diaminopyrazole-4-carboxylates
作者:Maria Teresa Cocco、Cenzo Congiu、Valentina Onnis、Angela Maria Bernard、Pier Paolo Piras
DOI:10.1002/jhet.5570360512
日期:1999.9
Simple and convenient synthesis of hitherto unknown 3,5-diaminopyrazole-4-carbothioamides 3 as well as new ethyl 3,5-diaminopyrazole-4-carboxylates 7 is reported. The key intermediates were 2-cyano-propenethioamides 2 and 2-(ethoxycarbonyl)propenethioamides 5 which were readily obtained by reaction of phenyl isothiocyanate with 3-(2-acylhydrazino)-3-aminopropenenitriles 1 and ethyl 3-(2-acylhydraz
据报道,迄今未知的3,5-二氨基吡唑-4-碳硫酰胺3以及新的3,5-二氨基吡唑-4-羧酸乙酯7的简便合成。关键中间体是2-氰基-丙烯硫代酰胺2和2-(乙氧基羰基)丙烯硫代酰胺5,它们可以通过异硫氰酸苯酯与3-(2-酰基肼基)-3-氨基丙烯腈1和乙基3-(2-酰基肼基)-的反应轻松获得。3-氨基丙酸酯分别为4。化合物2的分子内环化得到吡唑-4-碳硫代酰胺3,而丙烯硫酰胺5得到吡唑-4-羧酸酯7。