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Gondal HY, Nisar M, Cheema ZM, Iqbal K, Munir A, Zaidi S, Abbaskhan A. Synthesis and Applications of N-Alkoxymethylated Azaheterocycles. MINI-REV ORG CHEM 2023. [DOI: 10.2174/1570193x20666230124102142] [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: 02/05/2023]
Abstract
Alkoxmethyl heterocycles play a significant role as bioactive compounds in pharmaceutical and bifunctional ligands in synthetic organic chemistry. N-Alkoxmethylation can lead toward multipurpose mixed acetals, natural product precursors, and task-specific functionalized ionic liquids. This report provides a comprehensive account of the synthesis and perspectives applications of alkoxymethyl azaheterocycles. The first part gives a detailed account of the different synthetic strategies employed to access N-alkoxy methyl heterocyclic compounds. The second part deals with their applications, owing to the unique reactivity of the alkoxymethyl group and the nature of heterocycle. Besides diverse biological and synthetic applications, alkoxymethyl benzotriazoles also provide substantial scope as a versatile anion stabilizer that can lead to diverse oxygen functionalities.
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Affiliation(s)
- Humaira Y. Gondal
- Institute of Chemistry, University of Sargodha, Sargodha 40100, Pakistan
| | - Muhammad Nisar
- Institute of Chemistry, University of Sargodha, Sargodha 40100, Pakistan
| | - Zain M. Cheema
- Institute of Chemistry, University of Sargodha, Sargodha 40100, Pakistan
| | - Kiran Iqbal
- H.E.J. Research Institute of Chemistry, ICCBS, University of Karachi, Karachi 75270, Pakistan
| | - Akhtar Munir
- Department of Chemistry and Chemical Engineering, LUMS Lahore
| | - Sadia Zaidi
- H.E.J. Research Institute of Chemistry, ICCBS, University of Karachi, Karachi 75270, Pakistan
| | - Ahmed Abbaskhan
- H.E.J. Research Institute of Chemistry, ICCBS, University of Karachi, Karachi 75270, Pakistan
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Gondal HY, Mumtaz S, Abbaskhan A, Mumtaz N, Cano I. New alkoxymethyl-functionalized pyridinium-based chiral ionic liquids: synthesis, characterization and properties. Chem Pap 2020. [DOI: 10.1007/s11696-020-01135-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Abstract
Following numerous applications of Wittig reaction now functionalized phosphonium
salts are gaining attention due to their characteristic properties and diverse reactivity.
This review is focused on α-alkoxyalkyl triphenylphosphonium salts: an important
class of functionalized phosphonium salts. Alkoxymethyltriphenylphosphonium salts are
majorly employed in the carbon homologation of carbonyl compounds and preparation of
enol ethers. Their methylene insertion strategy is extensively demonstrated in the total
synthesis of a wide range of natural products and other important organic molecules. Similarly
enol ethers prepared thereof are important precursors for different organic transformations
like Diels-Alder reaction, Claisen rearrangement, Coupling reactions, Olefin metathesis
and Nazarov cyclization. Reactivity of these α-alkoxyalkylphosphonium salts
have also been studied in the nucleophilic substitution reactions. A distinctive application of this class of phosphonium
salts was recently reported in the phenylation of carbonyl compounds under very mild conditions.
Synthesis of structurally diverse alkoxymethyltriphenylphosphonium salts with variation in alkoxy groups as
well as counter anions are reported in literature. Here we present a detailed account of different synthetic
methodologies for the preparation of this unique class of quaternary phosphonium salts and their applications
in organic synthesis.
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Affiliation(s)
- Humaira Y. Gondal
- Department of Chemistry, University of Sargodha, Sargodha, 40100, Pakistan
| | - Zain M. Cheema
- Department of Chemistry, University of Sargodha, Sargodha, 40100, Pakistan
| | - Abdul R. Raza
- Department of Chemistry, University of Sargodha, Sargodha, 40100, Pakistan
| | - Ahmed Abbaskhan
- H.E.J. Research Institute of Chemistry, ICCBS, University of Karachi, Karachi, 75270, Pakistan
| | - M. I. Chaudhary
- H.E.J. Research Institute of Chemistry, ICCBS, University of Karachi, Karachi, 75270, Pakistan
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Cheema ZM, Gondal HY, Raza AR, Abbaskhan A. Nucleophilic phenylation: a remarkable application of alkoxymethyltriphenylphosphonium salts. Mol Divers 2019; 24:455-462. [PMID: 31154589 DOI: 10.1007/s11030-019-09966-z] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2019] [Accepted: 05/25/2019] [Indexed: 11/25/2022]
Abstract
A new application of α-alkoxymethylphosphonium salts in the nucleophilic phenylation of carbonyl compounds is demonstrated. Phenylation of aldehydes, ketones and acyl halides were studied by employing α-alkoxymethyltriphenylphosphonium halides in the presence of lithium hydroxide. New application of α-alkoxymethyltriphenylphosphonium salts. Metal-free, mild and selective phenylation. Easy preparation and handling of the reagent.
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Affiliation(s)
| | | | - Abdul Rauf Raza
- Department of Chemistry, University of Sargodha, Sargodha, 40100, Pakistan
| | - Ahmed Abbaskhan
- H.E.J. Research Institute of Chemistry, ICCBS, University of Karachi, Karachi, 75270, Pakistan
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Abbaskhan A, Choudhary MI, Ghayur MN, Parween Z, Shaheen F, Gilani AUH, Maruyama T, Iqbal K, Tsuda Y. Biological Activities of Indian Celery, Seseli diffusum (Roxb. ex Sm.) Sant. & Wagh. Phytother Res 2011; 26:783-6. [DOI: 10.1002/ptr.3600] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2011] [Revised: 05/27/2011] [Accepted: 05/27/2011] [Indexed: 11/06/2022]
Affiliation(s)
- Ahmed Abbaskhan
- H.E.J. Research Institute of Chemistry, International Center for Chemical and Biological Sciences; University of Karachi; Karachi; 75270; Pakistan
| | | | - Mohammed Nabeel Ghayur
- Department of Biological and Biomedical Sciences; The Aga Khan University; Karachi; 74800; Pakistan
| | - Zeba Parween
- H.E.J. Research Institute of Chemistry, International Center for Chemical and Biological Sciences; University of Karachi; Karachi; 75270; Pakistan
| | - Farzana Shaheen
- H.E.J. Research Institute of Chemistry, International Center for Chemical and Biological Sciences; University of Karachi; Karachi; 75270; Pakistan
| | - Anwar-ul-Hassan Gilani
- Department of Biological and Biomedical Sciences; The Aga Khan University; Karachi; 74800; Pakistan
| | - Takuro Maruyama
- Division of Pharmacognosy, Phytochemistry and Narcotics; National Institute of Health Sciences, 1-18-1, Kamiyoga; Setagaya-ku; Tokyo; 158-8501; Japan
| | - Kiran Iqbal
- H.E.J. Research Institute of Chemistry, International Center for Chemical and Biological Sciences; University of Karachi; Karachi; 75270; Pakistan
| | - Yoshisuke Tsuda
- H.E.J. Research Institute of Chemistry, International Center for Chemical and Biological Sciences; University of Karachi; Karachi; 75270; Pakistan
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Jan S, Abbaskhan A, Musharraf SG, Sattar SA, Resayes SI, Al-Othman ZA, Al-Majid AM, Choudhary MI. Three new cycloartane triterpenoids from Astragalus bicuspis. Planta Med 2011; 77:1829-1834. [PMID: 21766268 DOI: 10.1055/s-0030-1271196] [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: 05/31/2023]
Abstract
Three new cycloartane triterpenoids have been isolated from Astragalus bicUSPIS Fisch. Their structures were elucidated as 23(R),24(S),25( R),26(S)-16 β/23,23/26,24/25-triepoxy-26-hydroxy-9,19-cyclolanosta-3,6-dione (1), 6 α,23,24,25-tetraol-16 β-acetoxy-23(R),24(R)-9,19-cyclanosta-3-one (2), and 6 α,23,24,25-tetraol-16 β-acetoxy-23(R),24(R)-9,19-cyclolanosta-3 β- O-xyloside (3), based on their spectroscopic analysis. All cycloartane tritepenoids exhibited weak cytotoxicities against 3T3 fibroblast cells as compared to the standard drug cycloheximide. Compounds 3 and 4 were also tested for their antileishmanial potential, and a weak activity was observed against promastigotes of Leishmania major.
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Affiliation(s)
- Saleem Jan
- H. E. J. Research Institute of Chemistry, International Center for Chemical and Biological Sciences, University of Karachi, Karachi, Pakistan
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Choudhary MI, Ismail M, Shaari K, Abbaskhan A, Sattar SA, Lajis NH. cis-Clerodane-type furanoditerpenoids from Tinospora crispa. J Nat Prod 2010; 73:541-547. [PMID: 20356064 DOI: 10.1021/np900551u] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
Phytochemical and cytotoxicity investigations on organic solvent extracts of the aerial parts of Tinospora crispa have led to the isolation of 15 cis-clerodane-type furanoditerpenoids. Of these, nine compounds (1-9) were found to be new. Spectroscopic assignments of a previously reported compound, borapetoside A (13), were revised on the basis of HMQC and HMBC correlations. No discernible activity was observed when compounds 10-13 were subjected to evaluation in cytotoxicity assays against human prostate cancer (PC-3) and the normal mouse fibroblast (3T3) cell lines.
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Affiliation(s)
- M Iqbal Choudhary
- H.E.J. Research Institute of Chemistry, International Center for Chemical and Biological Sciences, University of Karachi, Karachi-75270, Pakistan
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Atta-ur-Rahman _, Hareem S, Iqbal Choudhary M, Sener B, Abbaskhan A, Siddiqui H, Anjum S, Orhan I, Gurbuz I, Ayanoglu F. New and Known Constituents from Iris unguicularis and Their Antioxidant Activity. HETEROCYCLES 2010. [DOI: 10.3987/com-10-s(e)6] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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9
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Choudhary MI, Maher S, Begum A, Abbaskhan A, Ali S, Khan A, Shafique-ur-Rehman, Atta-ur-Rahman. Characterization and Antiglycation Activity of Phenolic Constituents from Viscum album (European Mistletoe). Chem Pharm Bull (Tokyo) 2010; 58:980-2. [DOI: 10.1248/cpb.58.980] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Affiliation(s)
- M. Iqbal Choudhary
- H.E.J. Research Institute of Chemistry, International Center for Chemical and Biological Sciences, University of Karachi
| | - Saima Maher
- H.E.J. Research Institute of Chemistry, International Center for Chemical and Biological Sciences, University of Karachi
| | - Afshan Begum
- H.E.J. Research Institute of Chemistry, International Center for Chemical and Biological Sciences, University of Karachi
| | - Ahmed Abbaskhan
- H.E.J. Research Institute of Chemistry, International Center for Chemical and Biological Sciences, University of Karachi
| | - Sajjad Ali
- H.E.J. Research Institute of Chemistry, International Center for Chemical and Biological Sciences, University of Karachi
| | - Ambreen Khan
- H.E.J. Research Institute of Chemistry, International Center for Chemical and Biological Sciences, University of Karachi
| | | | - Atta-ur-Rahman
- H.E.J. Research Institute of Chemistry, International Center for Chemical and Biological Sciences, University of Karachi
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Choudhary MI, Naheed N, Abbaskhan A, Ali S. Hemiterpene glucosides and other constituents from Spiraea canescens. Phytochemistry 2009; 70:1467-1473. [PMID: 19747701 DOI: 10.1016/j.phytochem.2009.07.013] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/18/2009] [Revised: 07/08/2009] [Accepted: 07/09/2009] [Indexed: 05/28/2023]
Abstract
Five glycosides, 2-(trans-cinnamoyloxy-methyl)-1-butene-4-O-beta-D-glucopyranoside (1), 4-(6'-O-trans-cinnamoyl)-(2-hydroxymethyl-4-hydroxy-butenyl-beta-D-glucopyranoside (2), 6''-O-trans-p-coumaroyl-(4-hydroxybenzoyl)-beta-D-glucopyranoside (3), 6'-O-(4-methoxy-trans-cinnamoyl) alpha/beta-D-glucopyranose (4) 6'-O-(4''-methoxy-trans-cinnamoyl)-kaempferol-3-beta-D-glucopyranoside (7) along with six known compounds, (+)-isolariciresinol 3a-O-beta-D-glucopyranoside (8) (+)-lyoniresinol 3a-O-beta-D-glucopyranoside (9), apigenin 7-O-beta-D-glucopyranoside (10), quercetin 3-O-beta-D-glucopyranoside (11), 6'-O-cinnamoyl-alpha/beta-D-glucopyranose (6) 6'-O-p-coumaroyl-alpha/beta-D-glucopyranose (5) were isolated from the whole plant of Spiraea canescens. Some of these compounds showed potent radical scavenging activity in relevant non-physiological assays. Their structures were determined by NMR spectroscopic and CID mass spectrometric techniques.
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Affiliation(s)
- M Iqbal Choudhary
- H.E.J. Research Institute of Chemistry, International Center for Chemical and Biological Sciences, University of Karachi, Karachi 75270, Pakistan.
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11
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Maruyama T, Abbaskhan A, Choudhary MI, Tsuda Y, Goda Y, Farille M, Reduron JP. Botanical origin of Indian celery seed (fruit). J Nat Med 2009; 63:248-53. [DOI: 10.1007/s11418-009-0321-0] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2008] [Accepted: 01/09/2009] [Indexed: 11/24/2022]
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12
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Demirkiran O, Ahmed Mesaik M, Beynek H, Abbaskhan A, Iqbal Choudhary M. Cellular reactive oxygen species inhibitory constituents of Hypericum thasium Griseb. Phytochemistry 2009; 70:244-249. [PMID: 19203769 DOI: 10.1016/j.phytochem.2008.10.006] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/22/2008] [Revised: 09/30/2008] [Accepted: 10/13/2008] [Indexed: 05/27/2023]
Abstract
The phytochemical investigation of the ethyl acetate extract of Hypericum thasium has led to the characterization of four benzophenone derivatives 1-4, a known benzophenone 5 and four known flavonoids, quercetin (6), quercitrin (7), isoquercetin (8), and 3, 8''-biapigenin (9). Lucigenin- and luminal-based chemiluminescence assays were employed to monitor the inhibitory activity of these compounds towards the production of reactive oxygen species (ROS) by human polymorphoneutrophils (PMNs). The assay results showed that benzophenones 1 and 3 are extracellular inhibitors of ROS production, while flavonoids 6, 8, and 9 can modulate intracellular ROS production.
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Affiliation(s)
- Ozlem Demirkiran
- Department of Chemistry, Faculty of Science and Arts, Trakya University, Edirne 22030, Turkey
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Choudhary M, Begum A, Abbaskhan A, Musharraf S, Ejaz A, Atta-ur-Rahman. Two New Antioxidant Phenylpropanoids fromLindelofia stylosa. Chem Biodivers 2008; 5:2676-83. [DOI: 10.1002/cbdv.200890221] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Abstract
Three new cycloartane glycosides have been isolated from Astragalus bicuspis. They were identified as 6alpha-hydroxy-3-O-beta-xylopyranosyloxy-24,25,26,27-tetranor-9,19-cyclolanosta-16,23-lactone (1), 6alpha-hydroxy-23-methoxy-16beta,23(R)-epoxy-24,25,26,27-tetranor-9,19-cyclolanosta-3-O-beta-xyloside (2), and 23(R),24(S),25(R),26(S)-16beta/23,23/26,24/25-triepoxy-6alpha,26-dihydroxy-9,19-cyclolanosta-3-O-beta-xyloside (3), on the basis of their spectroscopic data. Two known cycloartane derivatives, 4 and 5, were also obtained from this plant. Compounds 2-5 were tested for leishmanicidal activity against Leishmania major promastigotes and for cytotoxicity against 3T3 cancer cells.
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Affiliation(s)
- M Iqbal Choudhary
- HEJ Research Institute of Chemistry, International Center for Chemical and Biological Sciences, University of Karachi, Karachi-75270, Pakistan.
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Choudhary MI, Naheed N, Abbaskhan A, Musharraf SG, Siddiqui H. Phenolic and other constituents of fresh water fern Salvinia molesta. Phytochemistry 2008; 69:1018-1023. [PMID: 18177906 DOI: 10.1016/j.phytochem.2007.10.028] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/14/2007] [Revised: 10/09/2007] [Accepted: 10/12/2007] [Indexed: 05/25/2023]
Abstract
Two glycosides, 6'-O-(3,4-dihydroxy benzoyl)-beta-D-glucopyranosyl ester (1), and 4-O-beta-d-glucopyranoside-3-hydroxy methyl benzoate (2), along with five known compounds methyl benzoate (3), hypogallic acid (4), caffeic acid (5), paeoniflorin (6) and pikuroside (7) were isolated for the first time from a fresh water fern Salvinia molesta D.S. Mitch. These compounds showed a potent antioxidant radical scavenging activity in a non-physiological assay. Their structures were determined by NMR spectroscopic and CID mass spectrometry techniques.
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Affiliation(s)
- M Iqbal Choudhary
- H.E.J. Research Institute of Chemistry, International Center for Chemical and Biological Sciences, University of Karachi, Karachi-75270, Pakistan.
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Yeskaliyeva B, Mesaik MA, Abbaskhan A, Kulsoom A, Burasheva GS, Abilov ZA, Choudhary MI. Bioactive flavonoids and saponins from Climacoptera obtusifolia. Phytochemistry 2006; 67:2392-7. [PMID: 16956629 DOI: 10.1016/j.phytochem.2006.07.003] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/16/2006] [Revised: 06/26/2006] [Accepted: 07/06/2006] [Indexed: 05/11/2023]
Abstract
Two bidesmosidic saponins were isolated from Climacoptera obtusifolia (Chenopodiaceae) and their structures were determined as gypsogenin 3-O-[beta-D-xylopyranosyl-(1-->3)-beta-D-glucopyranoside]-28-O-{beta-D-glucopyranosyl} ester (1) and hederagenin 3-O-[beta-D-xylopyranosyl-(1-->3)-beta-D-glucopyranoside]-28-O-[beta-D-glucopyranosyl} ester (2), by spectroscopic methods. Two known compounds, isorhamnetin 3-O-beta-D-glucopyranoside (3), and isorhamnetin 3-O-[alpha-L-rhamnopyranosyl-(1-->6)-beta-D-glucopyranoside (4) were also isolated for the first time from this plant. Compounds 1-4 were tested in various immunomodulatory assays. Compound 2 suppressed (92%) the reactive oxygen species (ROS) production on mononuclear cells in luminol-based chemiluminescence (CL) assay at a higher concentration (50 microg/mL). Compounds 3 and 4 demonstrated a strong inhibition on ROS production in the oxidative burst activity of whole blood, neutrophils, and mononuclear cells. Additionally compounds 3 and 4 also suppressed PHA T-cell proliferation with no cytotoxic effects.
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Affiliation(s)
- Balakyz Yeskaliyeva
- Department of Chemistry, Al-Farabi Kazakh National University, Almaty-480012, Kazakhstan
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Choudhary MI, Begum A, Abbaskhan A. Cinnamate derivatives of fructo-oligosaccharides from Lindelofia stylosa. Carbohydr Res 2006; 341:2398-405. [PMID: 16870163 DOI: 10.1016/j.carres.2006.06.005] [Citation(s) in RCA: 14] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2006] [Revised: 05/26/2006] [Accepted: 06/08/2006] [Indexed: 11/19/2022]
Abstract
Phytochemical investigation on the whole plants of Lindelofia stylosa (Kar. and Kir.) has led to the isolation of eight fructo-oligosaccharide cinnamate esters 1-8. Six new compounds 1, 2, and 5-8 were isolated from the butanol extract of the plant. Compounds 1-4 belong to sucrose derivatives, while compounds 5-6 and 7-8 belong to 1-kestose- and nystose-type oligosaccharides, respectively. The fructo-oligosaccharides have been obtained from L. stylosa for the first time.
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Affiliation(s)
- M Iqbal Choudhary
- H.E.J. Research Institute of Chemistry, International Center for Chemical Sciences, University of Karachi, Karachi 75270, Pakistan.
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Abstract
A phytochemical investigation on the aerial parts of Lindelofia stylosa has resulted in the isolation of seven phenyl propanoids. This includes three analogs of lithospermic acid, along with rosmarinic acid and its ester derivatives. Compound 1 was identified as a new natural product. These compounds were studied for their antioxidant properties.
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Affiliation(s)
- Muhammad Iqbal Choudhary
- H.E.J. Research Institute of Chemistry, International Center for Chemical Sciences, University of Karachi, Pakistan.
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Abstract
Microbial transformation of gelomulide G (3beta,6beta-diacetoxy-8beta,14beta-epoxyabiet-13(15)-en-16,12-olide, 1) was carried out. Incubation of 1 with Aspergillus niger afforded two new metabolites, 3beta,6beta-diacetoxy-8beta,14beta-dihydroxyabiet-13(15)-en-16,12-olide (2) and 3beta,6beta-diacetoxy-14beta-hydroxyabieta-8(9),13(15)-dien-16,12-olide (3). While Cunninghamella elegans afforded the 14-epimer of 2, i.e., 3beta,6beta-diacetoxy-8beta,14alpha-dihydroxyabiet-13(15)-en-16,12-olide (4), along with 3beta-acetoxy-6beta-hydroxy-8beta,14beta-epoxyabiet-13(15)-en-16,12-olide (5). The structures of the transformed products 2-5 were deduced to be new on the basis of MS and NMR data.
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Affiliation(s)
- M Iqbal Choudhary
- H.E.J. Research Institute of Chemistry, International Center for Chemical Sciences, University of Karachi, Karachi-75270, Pakistan.
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Choudhary M, Gondal HY, Abbaskhan A, Jahan IA, Parvez M, Nahar N, Atta-ur-Rahman. Revisiting diterpene lactones of Suregada multiflora. Tetrahedron 2004. [DOI: 10.1016/j.tet.2004.06.047] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Khan K, Maharvi G, Abbaskhan A, Hayat S, Khan M, Makhmoor T, Choudhary M, Shaheen F, Atta-ur-Rahman. Three Tyrosinase Inhibitors and Antioxidant Compounds from Salsola foetida. Helv Chim Acta 2003. [DOI: 10.1002/hlca.200390045] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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Abbaskhan A, Choudhary MI, Tsuda Y, Parvez M, Shaheen F, Parween Z, Tareen RB, Zaidi MA. A new diepoxy-ent-kauranoid, rugosinin, from Isodon rugosus. Planta Med 2003; 69:94-96. [PMID: 12567293 DOI: 10.1055/s-2003-37031] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
A new diterpenoid, rugosinin (1), isolated from Isodon rugosus, with absolute configuration was proved by single-crystal X-ray diffraction analysis, to be the member of a rare class of C-20/C-7 and C-20/C-14 diepoxy- ent-kauranoids. Effusanin A (2), effusanin B (3), effusanin E (4), lasiokaurin (5) and oridonin (6) were found as known constituents of the genus Isodon with C-20/C-7 epoxy function. These compounds have exhibited DNA-damaging activity in assay which employed DNA-repair deficient (RAD 52Y) and repair proficient (RAD +) yeast strains.
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Hayat S, Atta-ur-Rahman, Choudhary MI, Khan KM, Abbaskhan A. Two new cinnamic acid esters from Marine brown alga Spatoglossum variabile. Chem Pharm Bull (Tokyo) 2002; 50:1297-9. [PMID: 12237559 DOI: 10.1248/cpb.50.1297] [Citation(s) in RCA: 12] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Two new natural products, n-butyl and isopropyl 3,5-dimethoxy-4-hydroxycinnamate were isolated from Spatoglossum variabile. Three known compounds, methyl 3,4,5-trihydroxybenzoate, 2-deoxyinosine and 9-beta-(D-ribofuranosyl)adenine were isolated for the first time from the methanolic extracts of this alga. The structure elucidations of the new compounds were carried out with the help of modern spectroscopic techniques.
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Affiliation(s)
- Safdar Hayat
- International Center for Chemical Sciences, H. E. J. Research Institute of Chemistry, University of Karachi, Pakistan
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