Cytotoxic calanquinone A from Calanthe arisanensis and its first total synthesis.
Bioorg Med Chem Lett 2008;
18:4275-7. [PMID:
18640035 DOI:
10.1016/j.bmcl.2008.06.099]
[Citation(s) in RCA: 19] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2008] [Revised: 06/26/2008] [Accepted: 06/30/2008] [Indexed: 11/20/2022]
Abstract
Calanquinone A (1) was isolated from an EtOAc-soluble extract of Calanthe arisanensis through bioassay-guided fractionation. Its structure was identified by spectroscopic methods. Compound 1 showed potent cytotoxicity (EC(50)<0.5microg/mL) against lung (A549), prostate (PC-3 and DU145), colon (HCT-8), breast (MCF7), nasopharyngeal (KB), and vincristine-resistant nasopharyngeal (KB-VIN) cancer cell lines, and interestingly, showed an improved drug resistance profile compared to paclitaxel. The total synthesis of 1 was also achieved and is reported herein.
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