Synthesis and Stereochemical Assignment of (+)-Chamuvarinin
作者:Gordon J. Florence、Joanne C. Morris、Ross G. Murray、Jonathan D. Osler、Vanga R. Reddy、Terry K. Smith
DOI:10.1021/ol1028699
日期:2011.2.4
(+)-chamuvarinin, isolated from the root extract of Uvaria Chamae, utilizes a convergent modular strategy to construct the adjacently linked C15−C28 ether array, followed by a late-stage Julia−Kocienski olefination to append the butenolide motif. This constitutes the first total synthesis of (+)-chamuvarinin, defining the relative and absolute configuration of this unique annonaceous acetogenin.
Stereoselective Protection-Free Asymmetric Total Synthesis of (+)-Chamuvarinin, a Potent Anticancer and Antitrypanosomal Agent: Substrate-Controlled Construction of the Adjacently Linked Oxatricyclic Core by Internal Alkylation
A stereoselective protection-free asymmetrictotalsynthesis of (+)-chamuvarinin (1), a potent anticancer and antitrypanosomal agent, has been accomplished. The adjacently linked [bis(tetrahydrofuran)]tetrahydropyran (THF–THF–THP) core of this natural product with seven stereogenic centers was constructed in a completely substrate-controlled fashion. The inter-ring stereochemistry (threo,threo,threo)
Non-natural Acetogenin Analogues as Potent<i>Trypanosoma brucei</i>Inhibitors
作者:Gordon J. Florence、Andrew L. Fraser、Eoin R. Gould、Elizabeth F. B. King、Stefanie K. Menzies、Joanne C. Morris、Lindsay B. Tulloch、Terry K. Smith
DOI:10.1002/cmdc.201402272
日期:2014.11
AbstractNeglected tropical diseases remain a serious global health concern. Here, a series of novel bis‐tetrahydropyran 1,4‐triazole analogues based on the framework of chamuvarinin, a polyketide natural product isolated from the annonaceae plant species are detailed. The analogues synthesized display low micromolar trypanocidal activities towards both bloodstream and insect forms of Trypanosoma brucei, the causative agent of African sleeping sickness, also known as Human African Trypanosomiasis (HAT). A divergent synthetic strategy was adopted for the synthesis of the key tetrahydropyran intermediates to enable rapid access to diastereochemical variation either side of the 1,4‐triazole core. The resulting diastereomeric analogues displayed varying degrees of trypanocidal activity and selectivity in structure–activity relationship studies. Together, the biological potency and calculated lipophilicity values indicate that while there is room for improvement, these derivatives may represent a promising novel class of anti‐HAT agents.