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The use of other natural quinones, such as lapachol (1), in the synthesis of new heterocycles becomes important in the development of new bioactive substances, either in the combat of Chagas`s disease or in the treatment of other diseases. Silica gel column chromatography is the chromatographic method conventionally used for the purification of these derivates, however it consumes much time and large amounts of solvent. In order to improve the isolation procedure, high speed countercurrent chromatography was used instead. 3

Synthesis of naphthoxazole derivates from lapachol and their isolation by countercurrent chromatography