New and Practical Synthesis of N-(3-Cyano-7-ethoxy-4-oxo-1,4-dihydroquinolin-6-yl)acetamide

New and practical synthetic route of N-(3-cyano-7-ethoxy-4-oxo-1,4-dihydroquinolin-6-yl)acetamide (1) is described, through the cyclization of 2-aminophenyl-ethanone (12) with N,N-dimethylformamide dimethylacetal. The overall yield of 1 obtained from this process is 46% (five steps) with a purity of >99% (HPLC).