Journal
NATURE CHEMISTRY
Volume 3, Issue 8, Pages 615-619Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/NCHEM.1074
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Funding
- National Institutes of Health [CA31841]
- Alexander von Humboldt Foundation
- Office of the Vice Provost for Graduate Education
- Office of Technology Licensing
- Bristol-Myers Squibb
- Amgen
- Eli Lilly
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The daphnane diterpene orthoesters constitute a structurally fascinating family of natural products that exhibit a remarkable range of potent biological activities. Although partial activity information is available for some natural daphnanes, little information exists for non-natural congeners or on how changes in structure affect mode of action, function, potency or selectivity. A gateway strategy designed to provide general synthetic access to natural and non-natural daphnanes is described and utilized in the synthesis of two novel members of this class. In this study, a commercially available tartrate derivative was elaborated through a key late-stage diversification intermediate into B-ring yuanhuapin analogues to initiate exploration of the structure-function relationships of this class. Protein kinase C was identified as a cellular target for these agents, and their activity against human lung and leukaemia cell lines was evaluated. The natural product and a novel non-natural analogue exhibited significant potency, but the epimeric epoxide was essentially inactive.
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