A novel and efficient method for the synthesis of N-arylsulfonylamino-2-pyr
idones, via the reaction of N-cyanoaceto-hydrazides with ethyl arylidenecya
noacetate derivatives, is investigated; N-sulfonated aminopyridines are als
o prepared from the reaction of N-amino-2-pyridones with arylsulfonyl chlor
ides.