Synthese des 12-(3-Methoxy-5-phenyl)-2-pyrrolylmethylen-2H-[9](2,4)-pyrrolophans Ansamycine, 4. Mitt.: Chemie der Metacycloprodigiosine

The introduction of an acetoxy group into the pyrrol nucleus with lead tetraacetate is described and therewith involved mechanistic aspects are discussed. According to this method we obtained the aldehyde13 required for the synthesis of 3-methoxypyrromethene16.