Journal
JOURNAL OF MEDICINAL CHEMISTRY
Volume 57, Issue 6, Pages 2511-2523Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jm401799j
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- Natural Sciences and Engineering Research Council of Canada (NSERCC)
- Canadian Institutes of Health Research (CIHR)
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An efficient synthesis of hippuristanol (1), a marine-derived highly potent antiproliferative steroidal natural product, and nine closely related analogues has been accomplished from the commercially available hydrocortisone utilizing Hg(II)-catalyzed spiroketalization of 3-alkyne-1,7-diol motif as a key strategy. This practical synthetic sequence furnished 1 in 11% overall yield from hydrocortisone in 15 linear steps. Modifications to the parent molecule 1 encompassed changing the functional groups on rings A and E. Each analogue was screened for their effects on inhibition of cap-dependent translation, and the assay results were used to establish structure-activity relationships. These results suggest that the stereochemistry and all substituents of spiroketal portion (rings E and F) and C3-alpha and C11-beta hydroxyl functional groups on rings A and C, respectively, are critical for the inhibitory activity of natural product 1.
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