Efficient synthesis of some new functionalized 3-amino- and 5-aminopyrazoles derivatives
作者:Ehab Abdel-Latif、Abdel-Galil M. Khalil
DOI:10.1007/s11164-014-1551-7
日期:2015.7
key intermediates for the synthesis of some new 3-amino- and 5-aminopyrazole derivatives. Coupling of N ′-phenylsulfonyl-2-cyanoacetohydrazide ( 1 ) and 1-(2-cyanoacetyl)-4-phenyl thiosemicarbazide ( 4 ) with different aryl diazonium chlorides afforded the corresponding 5-amino-1-substituted-4-pyrazolin-3-one derivatives 3 and 6 , respectively. Treatment of ketene dithioacetal 9 and ketene-N,S-acetal