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Aldhaher A, Langat M, Ndunda B, Chirchir D, Midiwo JO, Njue A, Schwikkard S, Carew M, Mulholland D. Diterpenoids from the roots of Croton dichogamus Pax. Phytochemistry 2017; 144:1-8. [PMID: 28863305 DOI: 10.1016/j.phytochem.2017.08.014] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/13/2017] [Revised: 08/22/2017] [Accepted: 08/23/2017] [Indexed: 05/05/2023]
Abstract
Four previously undescribed diterpenoids including two crotofolanes, crotodichogamoin A and B, and two halimanes, crothalimene A and B, a new sesquiterpenoid, and fifteen previously reported compounds, including the crotofolane, crotohaumanoxide, the casbane, depressin, a further seven furanohalimane diterpenoids, three patchoulane and two further cadinane sesquiterpenoids and aleuritolic acid were isolated from the root of Croton dichogamus. Crotodichogamoin B is an important biosynthetic intermediate of the crotofolane class and this is the first report of patchoulene sesquiterpenoids from the genus. Compounds were tested at one concentration, 1 × 10-5 M, in the NCI59 cell one-dose screen but did not show significant activity snd were also evaluated for their cytotoxicity against Caco-2 cell lines using the neutral red assay. 10-epi-Maninsigin D reduced Caco-2 cell viability at 10, 30 and 100 μM, with values of decreased viability of 28%, 48% and 43% respectively. None of the other tested compounds showed significant activity.
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Affiliation(s)
- Areej Aldhaher
- Natural Products Research Group, Department of Chemistry, Faculty of Engineering and Physical Sciences, University of Surrey, Guildford, GU2 7XH, United Kingdom; Department of Biology, College of Science, Basrah University, Basrah, Iraq
| | - Moses Langat
- Natural Products Research Group, Department of Chemistry, Faculty of Engineering and Physical Sciences, University of Surrey, Guildford, GU2 7XH, United Kingdom; School of Chemistry and Physics, University of Natal, Durban, 4041, South Africa
| | - Beth Ndunda
- Natural Products Research Group, Department of Chemistry, Faculty of Engineering and Physical Sciences, University of Surrey, Guildford, GU2 7XH, United Kingdom; Department of Chemistry, University of Nairobi, P Bag 30197-00100, Nairobi, Kenya
| | - Denis Chirchir
- Department of Chemistry, Egerton University, P.O. Box 536, Njoro, 20115, Kenya
| | - Jacob O Midiwo
- Department of Chemistry, University of Nairobi, P Bag 30197-00100, Nairobi, Kenya
| | - Alice Njue
- Natural Products Research Group, Department of Chemistry, Faculty of Engineering and Physical Sciences, University of Surrey, Guildford, GU2 7XH, United Kingdom; Department of Chemistry, Egerton University, P.O. Box 536, Njoro, 20115, Kenya
| | - Sianne Schwikkard
- Department of Chemistry, School of Life Sciences, Pharmacy and Chemistry, Kingston University, Penrhyn Road, Kingston, KT1 2EE, United Kingdom
| | - Mark Carew
- Department of Chemistry, School of Life Sciences, Pharmacy and Chemistry, Kingston University, Penrhyn Road, Kingston, KT1 2EE, United Kingdom
| | - Dulcie Mulholland
- Natural Products Research Group, Department of Chemistry, Faculty of Engineering and Physical Sciences, University of Surrey, Guildford, GU2 7XH, United Kingdom; School of Chemistry and Physics, University of Natal, Durban, 4041, South Africa.
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Ndunda B, Langat MK, Mulholland DA, Eastman H, Jacob MR, Khan SI, Walker LA, Muhammad I, Kerubo LO, Midiwo JO. New ent-Clerodane and Abietane Diterpenoids from the Roots of Kenyan Croton megalocarpoides Friis & M. G. Gilbert. Planta Med 2016; 82:1079-1086. [PMID: 27286332 DOI: 10.1055/s-0042-108857] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
The roots of the endangered medicinal plant Croton megalocarpoides collected in Kenya were investigated and twenty-two compounds isolated. Among them were twelve new ent-clerodane (1-12) and a new abietane (13) diterpenoids, alongside the known crotocorylifuran (4 a), two known abietane and four known ent-trachylobane diterpenoids, and the triterpenoids, lupeol and acetyl aleurotolic acid. The structures of the compounds were determined using NMR, HRMS and ECD. The isolated compounds were evaluated against a series of microorganisms (fungal and bacteria) and also against Plasmodium falciparum, however no activity was observed.
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Affiliation(s)
- Beth Ndunda
- Department of Chemistry, University of Nairobi, Nairobi, Kenya
| | - Moses K Langat
- Department of Chemistry, University of Surrey, Guildford, Surrey, United Kingdom
| | - Dulcie A Mulholland
- Department of Chemistry, University of Surrey, Guildford, Surrey, United Kingdom
| | - Harry Eastman
- Department of Chemistry, University of Surrey, Guildford, Surrey, United Kingdom
| | - Melissa R Jacob
- National Centre for Natural Products Research, Research Institute of Pharmaceutical Sciences, School of Pharmacy, University of Mississippi, MS, USA
| | - Shabana I Khan
- National Centre for Natural Products Research, Research Institute of Pharmaceutical Sciences, School of Pharmacy, University of Mississippi, MS, USA
| | - Larry A Walker
- National Centre for Natural Products Research, Research Institute of Pharmaceutical Sciences, School of Pharmacy, University of Mississippi, MS, USA
| | - Ilias Muhammad
- National Centre for Natural Products Research, Research Institute of Pharmaceutical Sciences, School of Pharmacy, University of Mississippi, MS, USA
| | | | - Jacob O Midiwo
- Department of Chemistry, University of Nairobi, Nairobi, Kenya
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Ndunda B, Langat MK, Midiwo JO, Omosa LK. Diterpenoid Derivatives of Kenyan Croton sylvaticus. Nat Prod Commun 2015. [DOI: 10.1177/1934578x1501000403] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Kenyan Croton sylvaticus Hochst. ex Krauss gave four clerodane diterpenoids, the new ent–3,13 E-clerodadiene-15-formate (1), the known 15-acetoxy- ent-3,13 E-clerodadiene (2), ent-3,13 E-clerodadien-15-ol (3) and hardwickiic acid (4), two known halimane diterpenoids, penduliflaworosin (5) and crotohalimaneic acid (6) and one labdane diterpenoid, labda-13 E-ene-8α,15-diol (7). The compounds, when tested for their anti-microbial activities against Bacillus subtilis, Xanthomonas campestris and Candida albicans, were found to be inactive.
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Affiliation(s)
- Beth Ndunda
- Department of Chemistry, School of Physical Sciences, University of Nairobi, PO Box 30197-00100, Nairobi, Kenya
- Department of Chemistry, FEPS, University of Surrey, Guildford, Surrey, GU2 7XH, United Kingdom
| | - Moses K. Langat
- Department of Chemistry, FEPS, University of Surrey, Guildford, Surrey, GU2 7XH, United Kingdom
| | - Jacob O. Midiwo
- Department of Chemistry, School of Physical Sciences, University of Nairobi, PO Box 30197-00100, Nairobi, Kenya
| | - Leonidah K. Omosa
- Department of Chemistry, School of Physical Sciences, University of Nairobi, PO Box 30197-00100, Nairobi, Kenya
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Ndunda B, Langat MK, Midiwo JO, Omosa LK. Diterpenoid derivatives of Kenyan Croton sylvaticus. Nat Prod Commun 2015; 10:557-558. [PMID: 25973474] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/04/2023] Open
Abstract
Kenyan Croton sylvaticus Hochst. ex Krauss gave four clerodane diterpenoids, the new ent-3,13E-clerodadiene-15-formate (1), the known 15-acetoxy-ent-3,13E-clerodadiene (2), ent-3,13E-clerodadien-15-ol (3) and hardwickiic acid (4), two known halimane diterpenoids, penduliflaworosin (5) and crotohalimaneic acid (6) and one labdane diterpenoid, labda-13E-ene-8a,15-diol (7). The compounds, when tested for their anti-microbial activities against Bacillus subtilis, Xanthomonas campestris and Candida albicans, were found to be inactive.
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Ndunda B, Langat MK, Wanjohi JM, Midiwo JO, Kerubo LO. Alienusolin, a new 4α-deoxyphorbol ester derivative, and crotonimide C, a new glutarimide alkaloid from the Kenyan Croton alienus. Planta Med 2013; 79:1762-1766. [PMID: 24356872 DOI: 10.1055/s-0033-1351044] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Two novel compounds, alienusolin, a 4α-deoxyphorbol ester (1), crotonimide C, a glutarimide alkaloid derivative (2), and ten known compounds, julocrotine (3), crotepoxide (4), monodeacetyl crotepoxide (5), dideacetylcrotepoxide, (6), β-senepoxide (7), α-senepoxide (8), (+)-(2S,3R-diacetoxy-1-benzoyloxymethylenecyclohex-4,6-diene (9), benzyl benzoate (10), acetyl aleuritolic (11), and 24-ethylcholesta-4,22-dien-3-one (12) were isolated from the Kenyan Croton alienus. The structures of the compounds were determined using NMR, GCMS, and HRESIMS studies.
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Affiliation(s)
- Beth Ndunda
- Department of Chemistry, Nairobi University, Nairobi, Kenya
| | - Moses K Langat
- Department of Chemistry, FEPS, University of Surrey, Guildford, Surrey, United Kingdom
| | - John M Wanjohi
- Department of Chemistry, Nairobi University, Nairobi, Kenya
| | - Jacob O Midiwo
- Department of Chemistry, Nairobi University, Nairobi, Kenya
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