A Novel and Efficient Method for the Synthesis of N‐Arylsulfonylamino‐2‐pyridones.

A novel and efficient method for the synthesis of N-arylsulfonylamino-2-pyridones, via the reaction of N-cyanoacetohydrazides with ethyl arylidenecyanoacetate derivatives, is investigated; N-sulfonated aminopyridines are also prepared from the reaction of N-amino-2-pyridones with arylsulfonyl chlorides.