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