Patent ID: 6933388

Claim:
A process for the production of a 3-cyano-6-alkoxy-7-nitro-4-quinolone comprising: a) reacting a substituted anthranilate of formula (I) with dimethylformamide dimethyl acetal: wherein R and R 1 is an alkyl; to obtain a compound of formula (II): b) condensing the compound of formula (II) with t-butylcyanoacetate to obtain a compound of formula (III): c) hydrolyzing the compound of formula (III) to yield compound of formula (IV): d) decarboxylating the compound of formula (IV) to a compound of formula (V): e) cyclizing the compound of formula (V) to obtain a 3-cyano-6-alkoxy-7-nitro-4-quinolone of formula: