Naucline, a New Indole Alkaloid from the Bark of Nauclea officinalis†
1
Department of Chemistry, Faculty of Science, University of Malaya, 50603 Kuala Lumpur, Malaysia
2
Department of Pharmacology, Faculty of Medicine, University of Malaya, 50603 Kuala Lumpur, Malaysia
3
Faculty of Pharmaceutical Sciences, Hoshi University, Shinagawa-ku, Tokyo 142-8501, Japan
4
Institut de Chimie de la Substances Naturelles, Centre Nationale de la Recherches Scientifique, 91198, Gif-sur Yvette, Cedex, France
*
Author to whom correspondence should be addressed.
†
We wish to dedicate this article to our dearest colleague, Dr. Mat Ropi bin Mukhtar who has been a great inspiration to natural product research in Malaysia and globally.
Molecules 2012, 17(4), 4028-4036; https://doi.org/10.3390/molecules17044028
Received: 9 February 2012 / Revised: 27 March 2012 / Accepted: 28 March 2012 / Published: 2 April 2012
(This article belongs to the Section Natural Products Chemistry)
Abstract
A new indole alkaloid, naucline (1) together with four known alkaloids, angustine (2), angustidine (3), nauclefine (4) and naucletine (5), were isolated from the bark of Nauclea officinalis. The structures of all isolated compounds were elucidated with various spectroscopic methods such as 1D- and 2D- NMR, IR, UV and LCMS-IT-TOF. In addition to that of alkaloid 1, the complete 13C-NMR data of naucletine (5) were also reported. Naucline (1) showed a moderate vasorelaxant activity (90% relaxation at 1 × 10−5 M) whereas, angustine (2), nauclefine (4), and naucletine (5) showed potent vasorelaxant activity (more than 90% relaxation at 1 × 10−5 M) on an isolated rat aorta. View Full-TextKeywords:
naucline; angustine; angustidine; nauclefine; naucletine; Rubiaceae; vasorelaxant activity
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MDPI and ACS Style
Liew, S.Y.; Mukhtar, M.R.; Hadi, A.H.A.; Awang, K.; Mustafa, M.R.; Zaima, K.; Morita, H.; Litaudon, M. Naucline, a New Indole Alkaloid from the Bark of Nauclea officinalis. Molecules 2012, 17, 4028-4036.
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