A STRATEGY FROM CHEMISTS at Columbia University has enabled the first syntheses of several members of a structurally intricate family of oligomeric compounds derived from the red wine compound resveratrol ( Nature, DOI: 10.1038/nature10197). The team says its work could be applied to multiple classes of compounds. Plant species worldwide make oligomers of resveratrol to fend off fungal infections, and some of these compounds have promising anticancer and anti-HIV activity. Only small quantities can be obtained from natural sources. And they’re a thorny synthetic challenge because resveratrol can connect to itself in myriad ways, whereas units of other natural product oligomers, such as terpenes, typically link to one another in only one or two ways. Starting from resveratrol dimers the researchers had synthesized previously, Scott A. Snyder and coworkers use regioselective bromination reactions to selectively construct resveratrol trimers and tetramers, the highest order resveratrol oligomers prepared yet...

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A microcultura de um ginásio de treinamento de ginástica artística feminina de alto rendimento

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