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The facile synthesis of rifamycin S from rifamycin B, a member of the ansamycin family of antibiotics, via the oxidation of rifamycin B was developed. Currently on an industrial scale, this oxidation is performed using harsh pH conditions and chlorinated solvents. With the development of a suitable buffer/methanol system, a similar yield and space-time-yield in comparison to the current process can be obtained renouncing chlorinated solvents. Employment of methanol as a reaction medium in this process is crucial for attaining high yields under mild reaction conditions. With this method a space-time-yield of 189 g L–1 h–1 of rifamycin S was achieved in one step.