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A convenient metal-free oxidation protocol of various cyclic acetals with molecular oxygen and anthraquinone-2-carboxylic acid under visible light irradiation by a fluorescent lamp afforded their corresponding hydroxyalkyl esters.
Investigation of the terrestrial Streptomyces sp. BCC27095 led to the isolation of two new (1 and 2) and two known (3 and 5) anthraquinone derivatives along with the previously reported compound, steffimycin B (4). The chemical structures were determined on the basis of NMR spectroscopic data. These compounds exhibited significant antimalarial (against Plasmodium falciparum, K-1 multidrug resistant...
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