Calofolic acids A-F, chromanones from the bark of Calophyllum scriblitifolium with vasorelaxation activity.
Bioorg Med Chem Lett 2017;
27:2124-2128. [PMID:
28389148 DOI:
10.1016/j.bmcl.2017.03.071]
[Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2017] [Revised: 03/22/2017] [Accepted: 03/23/2017] [Indexed: 11/23/2022]
Abstract
Vasorelaxation activity guided separation of the methanol extract of Calophyllum scriblitifolium bark led to the isolation of 6 chromanones (calofolic acids A-F, 1-6). Their structures were elucidated by 1D and 2D NMR spectroscopy, and their absolute configurations were investigated by a combination of CD spectroscopy and DFT calculation. All isolated chromanones showed dose-dependent vasorelaxation activity on isolated rat aorta.
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