Trachyloban-19-oic acid (1) is a diterpene very abundant in nature and its structural modification can furnish new bioactive compounds. Biotransformation of 1 by fungus Syncephalastrum racemosum provided three derivatives, two hydroxylated products (2-3) and one product of rearrangement (4). Products 3 and 4 have never been reported so far, to the best of our knowledge. Structure of 3 was formed after oxidation and rearrangement of compound 2. Compounds 1-4 were evaluated for inhibition of acetylcholinesterase, enzyme linked to the symptomatic control of Alzheimer's disease. All the compounds presented inhibitory activity higher than starting material 1, and product 3 presented IC = 0.06 μM, which is about six times higher than activity found for galanthamine (IC = 0.38 μM), the positive control used in this assay.
Download full-text PDF |
Source |
---|---|
http://dx.doi.org/10.1016/j.bioorg.2018.04.011 | DOI Listing |
Nat Prod Res
December 2024
School of Life Sciences, Pharmacy and Chemistry, Kingston University, Kingston, UK.
Phytochemical analysis of the twigs and leaves of , endemic to Kenya, yielded known compounds 3-(3',4'-dimethoxyphenyl)-prop-1-ene (, 3-(3',4'-dimethoxyphenyl)-propenal (), lupeol () and -trachyloban-19-oic acid (), and a tentatively new -clerodane diterpenoid, crotokinondoenolide (). -Trachy-loban-19-oic acid () showed good activity against a panel of drug-resistant strains of and spp with MIC -values of 25 g/mL.
View Article and Find Full Text PDFBioorg Chem
September 2018
Universidade Federal de Minas Gerais (UFMG), Departamento de Química, Av. Antonio Carlos, 6627, CEP 31270-901 Belo Horizonte, MG, Brazil. Electronic address:
An Acad Bras Cienc
April 2018
Departamento de Química, Instituto de Ciências Exatas, Universidade Federal de Minas Gerais, Av. Antonio Carlos, 6627, Pampulha, 31270-901 Belo Horizonte, MG, Brazil.
The in vitro metabolism of a widespread natural product, trachyloban-19-oic acid (1), by the fungal species Mucor plumbeus was studied in a sucrose-yeast liquid medium. Two products were isolated, and their structures were determined by spectroscopic means as 7β-hydroxytrachyloban-19-oic acid (5) and trachyloban-19-O-β-D-glucopyranosyl ester (6). To the best of our knowledge, compound 6 is herein reported by the first time in the literature.
View Article and Find Full Text PDFFitoterapia
April 2012
Departamento de Farmacia, Universidad Nacional Autónoma de México, Ciudad Universitaria, 04510 D.F., Mexico.
From the roots of Iostephane heterophylla, six known compounds, namely, ent-trachyloban-19-oic acid (1), the mixture of ent-kaur-16-en-19-oic acid (2) and ent-beyer-15-en-19-oic acid (3), xanthorrhizol (4), 16α-hydroxy-ent-kaurane (5) and 16α-hydroxy-ent-kaur-11-en-19-oic acid (6) were isolated using a bioassay-guided fractionation method. The known compounds (1-6) were identified by comparison of their spectroscopic data with reported values in the literature. In an attempt to increase the resultant antimicrobial activity of 1 and 4, a series of reactions was performed on ent-trachyloban-19-oic acid (1) and xanthorrhizol (4), to obtain derivatives 1a, 1b, and 4a-4d.
View Article and Find Full Text PDFJ Chem Ecol
January 2009
Department of Entomology, North Dakota State University, Fargo, 58105, USA.
The banded sunflower moth (BSFM), Cochylis hospes Walshingham (Lepidoptera: Cochylidae) is a specialist insect, the larvae of which feed on sunflowers, Helianthus spp., and a few other species of Compositae. It is one of the most important pests of sunflower in the USA.
View Article and Find Full Text PDFEnter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!