10.1007/BF00810878
The research focuses on the synthesis of "Dithio-oxolinic Acid," a sulfur analog of Oxolinic Acid, which is part of a new class of synthetic chemotherapeutic agents known as Quinolones. The purpose of the study was to develop a method for synthesizing this compound, which could potentially exhibit antibacterial activity. The process involved the reduction of 5-amino-benzo-1,3-dithiol-2-thion using Diisobutylaluminiumhydrid (DIBAL) or Boran Methylsulfid (BMS) to obtain 5-amino-benzo-1,3-dithiol, which was then condensed with Ethoxymethylenmalons?urediethylester (EMME) to form an intermediate. This intermediate underwent a Gould-Jacobs reaction and subsequent alkylation to yield a mixture of isomers, which were separated by crystallization or chromatography. The final product, Dithio-oxolinic Acid (6a), showed antibacterial activity at higher concentrations and was found to be more active than a related compound (6b). Key chemicals used in the synthesis process included 5-Nitro-benzodithiol-2-thion, DIBAL, BMS, EMME, Dowtherm, Triethylphosphat, and K2CO3, among others.