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Issue 22, 2016
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First total synthesis of (+)-broussonetine W: glycosidase inhibition of natural product & analogs

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Abstract

The first total synthesis of (+)-broussonetine W (4), a naturally-occurring pyrrolidine iminosugar isolated from the traditional Chinese medical plant Broussonetia kazinoki SIEB (Moraceae), has been completed through a concise synthetic route starting from the readily available D-arabinose derived cyclic nitrone 10 in 11 steps and 31% overall yield, with regioselective installation of the α,β-unsaturated ketone functional group by the elimination of HBr from α-bromoketone as the key step. A number of analogs of (+)-broussonetine W (4) with variable side chain length, different polyhydroxylated pyrrolidine core configurations or saturated cyclohexanones have also been prepared to explore the glycosidase inhibition and the preliminary structure–activity relationship of this intriguing class of compounds. Glycosidase inhibition studies identified the natural product (+)-broussonetine W (4) as a selective and potent inhibitor of β-galactosidase (IC50 = 0.03 μM), while its enantiomer was a selective and potent inhibitor of α-glucosidase (IC50 = 0.047 μM). It was found that the configuration of the polyhydroxylated pyrrolidine ring played a key role on their glycosidase inhibitory activities. The length of side chain and α,β-unsaturated ketone functional group also exhibited some effect on their glycosidase inhibition.

Graphical abstract: First total synthesis of (+)-broussonetine W: glycosidase inhibition of natural product & analogs

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Publication details

The article was received on 06 Apr 2016, accepted on 06 May 2016 and first published on 10 May 2016


Article type: Paper
DOI: 10.1039/C6OB00720A
Citation: Org. Biomol. Chem., 2016,14, 5157-5174
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    First total synthesis of (+)-broussonetine W: glycosidase inhibition of natural product & analogs

    Y. Song, K. Kinami, A. Kato, Y. Jia, Y. Li, G. W. J. Fleet and C. Yu, Org. Biomol. Chem., 2016, 14, 5157
    DOI: 10.1039/C6OB00720A

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