A convenient synthesis of N‐aryl‐1,2‐dihydro‐2‐oxo‐3‐pyridinecarbox‐amides, N‐aryl‐N‐methyl‐1,2‐dihydro‐2‐oxo‐3‐pyridinecarboxamides and their 1‐methyl (O‐methyl)‐derivatives | Publicación