1
|
Koshikawa T, Nogami J, Nagashima Y, Tanaka K. Catalyst-Controlled Inter- and Intramolecular Cascade [4 + 2] Annulations via Benzopyrylium Intermediates. ACS Catal 2022. [DOI: 10.1021/acscatal.2c04740] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Takumi Koshikawa
- Department of Chemical Science and Engineering, Tokyo Institute of Technology, Ookayama, Meguro-ku, Tokyo 152-8550, Japan
| | - Juntaro Nogami
- Department of Chemical Science and Engineering, Tokyo Institute of Technology, Ookayama, Meguro-ku, Tokyo 152-8550, Japan
| | - Yuki Nagashima
- Department of Chemical Science and Engineering, Tokyo Institute of Technology, Ookayama, Meguro-ku, Tokyo 152-8550, Japan
| | - Ken Tanaka
- Department of Chemical Science and Engineering, Tokyo Institute of Technology, Ookayama, Meguro-ku, Tokyo 152-8550, Japan
| |
Collapse
|
2
|
Hop NQ, Son NT. A comprehensive review on phytochemistry and pharmacology of genus Kopsia: monoterpene alkaloids - major secondary metabolites. RSC Adv 2022; 12:19171-19208. [PMID: 35865593 PMCID: PMC9253876 DOI: 10.1039/d2ra01791a] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2022] [Accepted: 06/21/2022] [Indexed: 11/21/2022] Open
Abstract
Kopsia belongs to the family Apocynaceae, which was originally classified as a genus in 1823. Kopsia consists of medicinal plants that can be traditionally used to treat rheumatoid arthritis, pharyngitis, tonsillitis, and dropsy. More than one hundred and twenty-five publications have been documented relating to the phytochemical and pharmacological results, but a systematic review is not available. The goal of this study is to compile almost all of the secondary metabolites from the plants of genus Kopsia, as well as the coverage of their pharmacological research. The document findings were conducted via reliable sources, including Web of Science, Sci-Finder, Science Direct, PubMed, Google Scholar, and publishers, while four words “Kopsia”, “monoterpene alkaloids”, “Phytochemistry” and “Pharmacology” are key factors to search for references. Most Kopsia secondary metabolites were collected. A total of four hundred and seventy-two, including four hundred and sixty-six monoterpene alkaloids, five triterpenoids, and one sterol, were summarized, along with their resource. Kopsia monoterpene alkaloids presented in various skeletons, but aspidofractinines, eburnamines, and chanofruticosinates are the three major backbones. Mersinines and pauciflorines are new chemical classes of monoterpene alkaloids. With the rich content of monoterpene alkaloids, Kopsia constituents were also the main objects in pharmacological studies since the plant extracts and isolated compounds were proposed for anti-microbial, anti-inflammatory, anti-allergic, anti-diabetic, anti-manic, anti-nociceptive, acetylcholinesterase (AChE) inhibitory, cardiovascular, and vasorelaxant activities, especially cytotoxicity. Monoterpene alkaloids (466 isolated compounds) are major components, and anticancer activity is characteristic of Kopsia constituents.![]()
Collapse
Affiliation(s)
- Nguyen Quang Hop
- Faculty of Chemistry, Hanoi Pedagogical University 2 (HPU2) Nguyen Van Linh, Xuanhoa Phucyen Vinhphuc Vietnam
| | - Ninh The Son
- Institute of Chemistry, Vietnam Academy of Science and Technology (VAST) 18 Hoang Quoc Viet, Caugiay Hanoi Vietnam .,Graduate University of Science and Technology, VAST Vietnam
| |
Collapse
|
3
|
Heravi MM, Nazari A. Samarium(ii) iodide-mediated reactions applied to natural product total synthesis. RSC Adv 2022; 12:9944-9994. [PMID: 35424959 PMCID: PMC8965710 DOI: 10.1039/d1ra08163b] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2021] [Accepted: 03/12/2022] [Indexed: 12/22/2022] Open
Abstract
Natural product synthesis remains a field in which new synthetic methods and reagents are continually being evaluated. Due to the demanding structures and complex functionality of many natural products, only powerful and selective methods and reagents will be highlighted in this proceeding. Since its introduction by Henri Kagan, samarium(ii) iodide (SmI2, Kagan's reagent) has found increasing use in chemical synthesis. Over the years, many reviews have been published on the application of SmI2 in numerous reductive coupling procedures as well as in natural product total synthesis. This review highlights recent advances in SmI2-mediated synthetic strategies, as applied in the total synthesis of natural products since 2004. Natural product synthesis remains a field in which new synthetic methods and reagents are continually being evaluated.![]()
Collapse
Affiliation(s)
- Majid M Heravi
- Department of Chemistry, School of Science, Alzahra University PO Box 1993891176 Vanak Tehran Iran +98 21 88041344 +98 21 88044051
| | - Azadeh Nazari
- Department of Chemistry, School of Science, Alzahra University PO Box 1993891176 Vanak Tehran Iran +98 21 88041344 +98 21 88044051
| |
Collapse
|
4
|
Zhang W, Lin S, Du C, Feng S, Liu Z, Zhang J, Xie X, Wang X, Li H, She X. Total Synthesis of Aspidofractinine Alkaloid Paucidirinine. J Org Chem 2019; 84:1111-1116. [PMID: 30562463 DOI: 10.1021/acs.joc.8b03023] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The first total synthesis of paucidirinine (1d), a highly congested aspidofractinine alkaloid containing a special contracted five-membered lactam ring, was achieved in 10 steps with 8% overall yield from commercially available materials. Several key maneuvers, including tandem enamination/[4 + 2] cycloaddition reaction and SmI2-promoted radical cyclization, were featured in this potentially scalable strategy.
Collapse
Affiliation(s)
- Weiwei Zhang
- State Key Laboratory of Applied Organic Chemistry, Department of Chemistry , Lanzhou University , Lanzhou 730000 , People's Republic of China
| | - Shanhao Lin
- State Key Laboratory of Applied Organic Chemistry, Department of Chemistry , Lanzhou University , Lanzhou 730000 , People's Republic of China
| | - Chenglong Du
- State Key Laboratory of Applied Organic Chemistry, Department of Chemistry , Lanzhou University , Lanzhou 730000 , People's Republic of China
| | - Shangbiao Feng
- State Key Laboratory of Applied Organic Chemistry, Department of Chemistry , Lanzhou University , Lanzhou 730000 , People's Republic of China
| | - Zaimin Liu
- State Key Laboratory of Applied Organic Chemistry, Department of Chemistry , Lanzhou University , Lanzhou 730000 , People's Republic of China
| | - Jing Zhang
- State Key Laboratory of Applied Organic Chemistry, Department of Chemistry , Lanzhou University , Lanzhou 730000 , People's Republic of China
| | - Xingang Xie
- State Key Laboratory of Applied Organic Chemistry, Department of Chemistry , Lanzhou University , Lanzhou 730000 , People's Republic of China
| | - Xiaolei Wang
- State Key Laboratory of Applied Organic Chemistry, Department of Chemistry , Lanzhou University , Lanzhou 730000 , People's Republic of China
| | - Huilin Li
- State Key Laboratory of Applied Organic Chemistry, Department of Chemistry , Lanzhou University , Lanzhou 730000 , People's Republic of China
| | - Xuegong She
- State Key Laboratory of Applied Organic Chemistry, Department of Chemistry , Lanzhou University , Lanzhou 730000 , People's Republic of China
| |
Collapse
|
5
|
Wang ZW, Shi XJ, Mu Y, Fang L, Chen Y, Lin YL. Three novel indole alkaloids from Kopsia officinalis. Fitoterapia 2017; 119:8-11. [PMID: 28363506 DOI: 10.1016/j.fitote.2017.01.017] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2016] [Revised: 01/02/2017] [Accepted: 01/03/2017] [Indexed: 10/19/2022]
Abstract
Three new indole alkaloids, named kopsioffines A-C (1-3), possessing relatively novel ten-membered lactam ring, and one known compound (11,12-demethoxy-16-deoxypauciflorine, 4) were isolated from the leaves and stems of Kopsia officinalis. Their structures were elucidated by means of spectroscopic methods. The absolute configuration of 1 was determined by calculated electronic circular dichroism data. The hypothetical biosynthetic pathway of 1 was postulated. All these isolates were evaluated for their inhibitory effects on α-glucosidase. None of them showed activity with IC50 far beyond 50μM.
Collapse
Affiliation(s)
- Zhi-Wei Wang
- Shandong Key Laboratory of TCM Quality Control Technology, Shandong Analysis and Test Center, Shandong Academy of Sciences, 19 Keyuan Street, Jinan, Shandong 250014, China.
| | - Xiao-Jian Shi
- Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Haike Road 501, Shanghai 201203, China
| | - Yan Mu
- Shandong Key Laboratory of TCM Quality Control Technology, Shandong Analysis and Test Center, Shandong Academy of Sciences, 19 Keyuan Street, Jinan, Shandong 250014, China
| | - Lei Fang
- Shandong Key Laboratory of TCM Quality Control Technology, Shandong Analysis and Test Center, Shandong Academy of Sciences, 19 Keyuan Street, Jinan, Shandong 250014, China
| | - Yue Chen
- Shandong Key Laboratory of TCM Quality Control Technology, Shandong Analysis and Test Center, Shandong Academy of Sciences, 19 Keyuan Street, Jinan, Shandong 250014, China
| | - Yun-Liang Lin
- Shandong Key Laboratory of TCM Quality Control Technology, Shandong Analysis and Test Center, Shandong Academy of Sciences, 19 Keyuan Street, Jinan, Shandong 250014, China
| |
Collapse
|
6
|
Wong SP, Chong KW, Lim KH, Lim SH, Low YY, Kam TS. Arborisidine and Arbornamine, Two Monoterpenoid Indole Alkaloids with New Polycyclic Carbon-Nitrogen Skeletons Derived from a Common Pericine Precursor. Org Lett 2016; 18:1618-21. [PMID: 27033525 DOI: 10.1021/acs.orglett.6b00478] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Two new monoterpene indole alkaloids, characterized by previously unencountered natural product skeletons, viz., arborisidine (1), incorporating indolizidine and cyclohexanone moieties fused to an indole unit, and arbornamine (2), incorporating an unprecedented 6/5/6/5/6 "arbornane" skeleton (distinct from the eburnan or tacaman skeleton), were isolated from a Malayan Kopsia arborea. The structures of the alkaloids were determined based on analysis of the NMR and MS data. Possible biogenetic pathways to these alkaloids from a common pericine precursor (3) are presented.
Collapse
Affiliation(s)
- Suet-Pick Wong
- Department of Chemistry, Faculty of Science, University of Malaya , 50603 Kuala Lumpur, Malaysia
| | - Kam-Weng Chong
- Department of Chemistry, Faculty of Science, University of Malaya , 50603 Kuala Lumpur, Malaysia
| | - Kuan-Hon Lim
- School of Pharmacy, University of Nottingham Malaysia Campus , Jalan Broga, 43500 Semenyih, Selangor, Malaysia
| | - Siew-Huah Lim
- Department of Chemistry, Faculty of Science, University of Malaya , 50603 Kuala Lumpur, Malaysia
| | - Yun-Yee Low
- Department of Chemistry, Faculty of Science, University of Malaya , 50603 Kuala Lumpur, Malaysia
| | - Toh-Seok Kam
- Department of Chemistry, Faculty of Science, University of Malaya , 50603 Kuala Lumpur, Malaysia
| |
Collapse
|
7
|
Yap WS, Gan CY, Sim KS, Lim SH, Low YY, Kam TS. Aspidofractinine and Eburnane Alkaloids from a North Borneo Kopsia. Ring-Contracted, Additional Ring-Fused, and Paucidactine-Type Aspidofractinine Alkaloids from K. pauciflora. JOURNAL OF NATURAL PRODUCTS 2016; 79:230-239. [PMID: 26717050 DOI: 10.1021/acs.jnatprod.5b00992] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Eleven new indole alkaloids (1-11) comprising seven aspidofractinine and four eburnane alkaloids, were isolated from the stem-bark extract of Kopsia pauciflora occurring in Malaysian Borneo. The aspidofractinine alkaloids include a ring-contracted, an additional ring-fused, a paucidactine regioisomer, two paucidactine, and one kopsine alkaloid. The structures of several of these alkaloids were also confirmed by X-ray diffraction analyses. The bisindole alkaloids isolated, norpleiomutine and kopsoffinol, showed in vitro growth inhibitory activity against human PC-3, HCT-116, MCF-7, and A549 cells and moderate effects in reversing multidrug-resistance in vincristine-resistant human KB cells.
Collapse
Affiliation(s)
| | - Chew-Yan Gan
- University Malaysia of Computer Science and Engineering , Jalan Alamanda 2, Precint 1, 62000 Putrajaya, Malaysia
| | | | | | | | | |
Collapse
|
8
|
Huang HX, Jin SJ, Gong J, Zhang D, Song H, Qin Y. Studies of a Diazo Cyclopropanation Strategy for the Total Synthesis of (−)-Lundurine A. Chemistry 2015; 21:13284-90. [DOI: 10.1002/chem.201502011] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2015] [Indexed: 11/07/2022]
|
9
|
Wong SP, Gan CY, Lim KH, Ting KN, Low YY, Kam TS. Arboridinine, a Pentacyclic Indole Alkaloid with a New Cage Carbon-Nitrogen Skeleton Derived from a Pericine Precursor. Org Lett 2015; 17:3628-31. [PMID: 26183592 DOI: 10.1021/acs.orglett.5b01757] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A new monoterpene indole alkaloid characterized by an unprecedented pentacyclic cage skeleton, arboridinine (1), was isolated from a Malaysian Kopsia species. The structure and absolute configuration of the alkaloid were determined based on NMR, MS, and X-ray diffraction analysis. A possible biogenetic pathway from a pericine precursor is presented.
Collapse
Affiliation(s)
- Suet-Pick Wong
- †Department of Chemistry, Faculty of Science, University of Malaya, 50603 Kuala Lumpur, Malaysia
| | - Chew-Yan Gan
- ‡University Malaysia of Computer Science and Engineering, Jalan Alamanda 2, Precint 1, 62000 Putrajaya, Malaysia
| | | | | | - Yun-Yee Low
- †Department of Chemistry, Faculty of Science, University of Malaya, 50603 Kuala Lumpur, Malaysia
| | - Toh-Seok Kam
- †Department of Chemistry, Faculty of Science, University of Malaya, 50603 Kuala Lumpur, Malaysia
| |
Collapse
|
10
|
Jin S, Gong J, Qin Y. Total Synthesis of (−)-Lundurine A and Determination of its Absolute Configuration. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201409963] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
|
11
|
Total Synthesis of (−)-Lundurine A and Determination of its Absolute Configuration. Angew Chem Int Ed Engl 2014; 54:2228-31. [DOI: 10.1002/anie.201409963] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2014] [Revised: 10/27/2014] [Indexed: 11/07/2022]
|
12
|
Gan CY, Yoganathan K, Sim KS, Low YY, Lim SH, Kam TS. Corynanthean, eburnan, secoleuconoxine, and pauciflorine alkaloids from Kopsia pauciflora. PHYTOCHEMISTRY 2014; 108:234-242. [PMID: 25442910 DOI: 10.1016/j.phytochem.2014.09.014] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/18/2014] [Revised: 08/28/2014] [Accepted: 09/01/2014] [Indexed: 06/04/2023]
Abstract
Eleven indole alkaloids, comprising four corynanthean, two eburnane, one aspidofractinine, one secoleuconoxine, one andranginine, and two pauciflorine type alkaloids were isolated from the stem-bark and leaf extracts of Kopsia pauciflora. Their structures were determined using NMR and MS analyses. The catharinensine type alkaloid kopsirensine B and the secoleuconoxine alkaloid arboloscine A showed moderate to weak activity in reversing MDR in vincristine-resistant KB cells. The alkaloid content was markedly different compared to that of a sample from Malaysian Borneo.
Collapse
Affiliation(s)
- Chew-Yan Gan
- University Malaysia of Computer Science and Engineering, Jalan Alamanda 2, Precint 1, 62000 Putrajaya, Malaysia
| | - K Yoganathan
- Bioinformatics Institute (BII), Agency for Science, Technology and Research (A*STAR), 30 Biopolis Street, 07-01 Matrix, Singapore 138671, Singapore
| | - Kae-Shin Sim
- Institute of Biological Sciences, University of Malaya, 50603 Kuala Lumpur, Malaysia
| | - Yun-Yee Low
- Department of Chemistry, University of Malaya, 50603 Kuala Lumpur, Malaysia
| | - Siew-Huah Lim
- Department of Chemistry, University of Malaya, 50603 Kuala Lumpur, Malaysia
| | - Toh-Seok Kam
- Department of Chemistry, University of Malaya, 50603 Kuala Lumpur, Malaysia.
| |
Collapse
|
13
|
Pathak S, Debnath K, Mollick MMR, Pramanik A. Facile cyclization in the synthesis of highly fused diaza cyclooctanoid compounds using retrievable nano magnetite-supported sulfonic acid catalyst. RSC Adv 2014. [DOI: 10.1039/c4ra03384a] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Magnetically separable Fe3O4–SO3H nano particles have been prepared and established as an efficient catalyst for the synthesis of dihydrofuran fused cyclooctanoids via the dehydration reaction of dihydroxy cyclooctanoid heterocylces.
Collapse
Affiliation(s)
- Sudipta Pathak
- Department of Chemistry
- University of Calcutta
- Kolkata-700 009, India
| | - Kamalesh Debnath
- Department of Chemistry
- University of Calcutta
- Kolkata-700 009, India
| | | | - Animesh Pramanik
- Department of Chemistry
- University of Calcutta
- Kolkata-700 009, India
| |
Collapse
|
14
|
Chapter 2: Cascade reactions of carbonyl ylides for heterocyclic synthesis. ACTA ACUST UNITED AC 2009. [DOI: 10.1016/s0959-6380(09)70006-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/13/2023]
|
15
|
Lim KH, Low YY, Tan GH, Kam TS, Lim TM. Kopsine and Danuphylline Alkaloids fromKopsia.Biomimetic Partial Synthesis of Danuphylline B. Helv Chim Acta 2008. [DOI: 10.1002/hlca.200890169] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
|
16
|
Subramaniam G, Kam TS. New Indole Alkaloids fromKopsia. Alkaloid Variation inKopsia singapurensis. Helv Chim Acta 2008. [DOI: 10.1002/hlca.200890098] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
|
17
|
Subramaniam G, Choo YM, Hiraku O, Komiyama K, Kam TS. The alkaloids of the mersinine group: a new subclass of the monoterpenoid indole alkaloids from Kopsia. Tetrahedron 2008. [DOI: 10.1016/j.tet.2007.11.047] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
|
18
|
Affiliation(s)
- Toh-Seok Kam
- Department of Chemistry, University of Malaya, 50603 Kuala Lumpur, Malaysia.
| | | |
Collapse
|
19
|
Subramaniam G, Hiraku O, Hayashi M, Koyano T, Komiyama K, Kam TS. Biologically active aspidofractinine alkaloids from Kopsia singapurensis. JOURNAL OF NATURAL PRODUCTS 2008; 71:53-57. [PMID: 18078327 DOI: 10.1021/np070401t] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
Ten new indole alkaloids of the aspidofractinine type, in addition to several recently reported indole alkaloids and 20 other known alkaloids, were obtained from the leaf and stem-bark extract of the Malayan Kopsia singapurensis, viz., kopsimalines A-E (1-5), kopsinicine (6), kopsofinone (7), and kopsiloscines H-J (8-10). The structures of these alkaloids were determined using NMR and MS analysis. Kopsimalines A (1), B (2), C (3), D (4), and E (5) and kopsiloscine J (10) were found to reverse multidrug-resistance in vincristine-resistant KB cells, with 1 showing the highest potency.
Collapse
Affiliation(s)
- G Subramaniam
- Department of Chemistry, University of Malaya, Kuala Lumpur, Malaysia
| | | | | | | | | | | |
Collapse
|
20
|
Subramaniam G, Hiraku O, Hayashi M, Koyano T, Komiyama K, Kam TS. Biologically active aspidofractinine, rhazinilam, akuammiline, and vincorine alkaloids from Kopsia. JOURNAL OF NATURAL PRODUCTS 2007; 70:1783-1789. [PMID: 17939738 DOI: 10.1021/np0703747] [Citation(s) in RCA: 102] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
Eleven new indole alkaloids, in addition to the previously reported rhazinal (1), and 14 other known alkaloids, were obtained from the Malayan Kopsia singapurensis, viz., kopsiloscines A-F (2-7), 16-epikopsinine (8), kopsilongine- N-oxide (9), 16-epiakuammiline (10), aspidophylline A (11), and vincophylline (12). The structures of these alkaloids were determined using NMR and MS analyses. Rhazinal (1), rhazinilam (17), and rhazinicine (18) showed appreciable cytotoxicity toward drug-sensitive as well as vincristine-resistant KB cells, while kopsiloscines A (2), B (3), and D (5) and aspidophylline A (11) were found to reverse drug-resistance in drug-resistant KB cells.
Collapse
Affiliation(s)
- G Subramaniam
- Department of Chemistry, University of Malaya, 50603 Kuala Lumpur, Malaysia
| | | | | | | | | | | |
Collapse
|
21
|
Mersinaline and mersirachine, novel quinolinic alkaloids of the mersinine group from Kopsia. Tetrahedron Lett 2007. [DOI: 10.1016/j.tetlet.2007.07.122] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
|
22
|
Hong X, France S, Mejía-Oneto JM, Padwa A. Cycloaddition protocol for the assembly of the hexacyclic framework associated with the kopsifoline alkaloids. Org Lett 2007; 8:5141-4. [PMID: 17048863 PMCID: PMC2475586 DOI: 10.1021/ol062029z] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
An approach to the hexacyclic framework of the kopsifoline alkaloids has been developed and is based on a Rh(II)-catalyzed cyclization-cycloaddition cascade. The resulting [3+2]-cycloadduct was readily converted into the TBS enol ether 23. Oxidation of the primary alcohol present in 23 followed by reaction with CsF afforded compound 24 that contains the complete hexacyclic skeleton of the kopsifolines. [reaction: see text]
Collapse
|
23
|
Hong X, France S, Padwa A. A Dipolar Cycloaddition Approach Toward the Kopsifoline Alkaloid Framework. Tetrahedron 2007; 63:5962-5976. [PMID: 17710185 PMCID: PMC1948834 DOI: 10.1016/j.tet.2007.01.064] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Using a metal-catalyzed domino reaction as the key step, the heterocyclic skeleton of the kopsifoline alkaloid family was constructed by a 1,3-dipolar cycloaddition of a carbonyl ylide dipole derived from a Rh(II)-catalyzed reaction of a diazo ketoester across the indole pi-bond. Ring opening of the resulting 1,3-dipolar cycloadduct followed by a reductive dehydroxylation step resulted in the formation of a critical silyl enol ether necessary for the final F-ring closure of the kopsifoline skeleton.
Collapse
Affiliation(s)
| | | | - Albert Padwa
- Corresponding Author: Tel.: 404-727-0283; Fax: 404-727-6629; e-mail:
| |
Collapse
|
24
|
Lim KH, Komiyama K, Kam TS. Arboricine and arboricinine, unusual tetracyclic indole regioisomers from Kopsia. Tetrahedron Lett 2007. [DOI: 10.1016/j.tetlet.2006.12.070] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
|
25
|
|
26
|
Hájíček J. A Review on Recent Developments in Syntheses of the post-Secodine Indole Alkaloids. Part II: Modified Alkaloid Types. ACTA ACUST UNITED AC 2007. [DOI: 10.1135/cccc20070821] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
The second part of the planned review on developments in the field of total and formal total synthesis of the post-secodine indole alkaloids concentrates on modified alkaloid types, i.e. those skeletons derived from primary types by formation of additional and/or rupture of existing bonds, while connectivities next to indol(e)ine moiety remain intact. It thus reviews the synthesis of alkaloids of quebrachamine/cleavamine type including VLB-bis-indoles, rhazinilam type, aspidofractinine/kopsane and kopsifoline type, as well as kopsijasminilam alkaloids, lapidilectine B and danuphylline. It covers the literature of from 1991-1992 up to approximately end 2006. A review with 174 references.
Collapse
|
27
|
Lim KH, Kam TS. Arboflorine, an Unusual Pentacyclic Monoterpenoid Indole Alkaloid Incorporating a Third Nitrogen Atom. Org Lett 2006; 8:1733-5. [PMID: 16597153 DOI: 10.1021/ol060348k] [Citation(s) in RCA: 58] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
[structure: see text] A new indole alkaloid, arboflorine, possessing a novel pentacyclic carbon skeleton and incorporating a third nitrogen atom was obtained from the Malayan Kopsia arborea. The structure was established by spectroscopic analysis, and a possible biogenetic pathway from a preakuammicine-type precursor is presented.
Collapse
Affiliation(s)
- Kuan-Hon Lim
- Department of Chemistry, University of Malaya, 50603 Kuala Lumpur, Malaysia
| | | |
Collapse
|
28
|
Kam TS, Lim KH, Yoganathan K, Hayashi M, Komiyama K. Lundurines A–D, cytotoxic indole alkaloids incorporating a cyclopropyl moiety from Kopsia tenuis and revision of the structures of tenuisines A–C. Tetrahedron 2004. [DOI: 10.1016/j.tet.2004.08.091] [Citation(s) in RCA: 63] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
|
29
|
Kam TS, Subramaniam G, Lim KH, Choo YM. Mersicarpine, an unusual tetracyclic dihydroindole alkaloid incorporating a seven-membered imine ring. Tetrahedron Lett 2004. [DOI: 10.1016/j.tetlet.2004.06.039] [Citation(s) in RCA: 91] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
|
30
|
Kam TS, Choo YM. Venalstonine and dioxokopsan derivatives from Kopsia fruticosa. PHYTOCHEMISTRY 2004; 65:2119-2122. [PMID: 15279982 DOI: 10.1016/j.phytochem.2004.03.027] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/21/2004] [Revised: 03/17/2004] [Indexed: 05/24/2023]
Abstract
Two new venalstonine derivatives, viz., venacarpines A and B, and one new dioxokopsan derivative, kopsorinine, in addition to the kopsifolines A-F, and 11 other known alkaloids, were isolated from a Malayan Kopsia species. The structures of the new alkaloids were determined using NMR and MS analysis.
Collapse
Affiliation(s)
- Toh-Seok Kam
- Department of Chemistry, University of Malaya, Pantai Valley, 50603 Kuala Lumpur, Malaysia.
| | | |
Collapse
|
31
|
|
32
|
Li G, Ju HK, Chang HW, Jahng Y, Lee SH, Son JK. Melanin biosynthesis inhibitors from the bark of Machilus thunbergii. Biol Pharm Bull 2003; 26:1039-41. [PMID: 12843636 DOI: 10.1248/bpb.26.1039] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The bioassay-guided fractionation of the methylene chloride soluble portion of a methanol extract of Machilus thunbergii bark led to the isolation of four known lignans, machilin A (1), meso-monomethyl dihydroguaiaretic acid (2), nectandrin A (3) and nectandrin B (4), which exhibited potent inhibitory activity on melanin biosynthesis in cultured B-16 mouse melanoma cells (IC(50): 39.9, 15.1, 19.4 and 37.8 microM, respectively).
Collapse
Affiliation(s)
- Gao Li
- College of Pharmacy, Yeungnam University, Gyongsan, Korea
| | | | | | | | | | | |
Collapse
|
33
|
Husain K, Jantan I, Said IM, Aimi N, Takayama H. Two new methyl chanofruticosinates from Kopsia flavida blume. JOURNAL OF ASIAN NATURAL PRODUCTS RESEARCH 2003; 5:63-67. [PMID: 12608641 DOI: 10.1080/1028602031000080487] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Two new indole alkaloids with the methyl chanofruticosinate skeletal system viz., methyl 3-oxo-12-methoxy-N1-decarbomethoxy-14,15-didehydrochanofruticosinate (1) and methyl 3-oxo-11,12-methylenedioxy-N-decarbomethoxy-14,15-didehydrochanofruticosinate (2), together with four known compounds, methyl 12-methoxy-N1-decarbomethoxychanofruticosinate, methyl 12-methoxychanofruticosinate, methyl 11,12-dimethoxychanofruticosinate and methyl 11,12-methylenedioxy-N1-decarbomethoxychanofruticosinate, were isolated in continuing studies on the leaves of Kopsia flavida Blume. The structures of the new indole alkaloids were assigned by NMR spectral data using various 2D-techniques.
Collapse
Affiliation(s)
- Khairana Husain
- Department of Pharmacy, Faculty of Allied Health Sciences, Universiti Kebangsaan Malaysia, Jalan Raja Muda Abdul Aziz, 50300 Kuala Lumpur, Malaysia.
| | | | | | | | | |
Collapse
|
34
|
Kam TS, Choo YM. Kopsifolines A, B, and C, indole alkaloids with a novel hexacyclic carbon skeleton from Kopsia. Tetrahedron Lett 2003. [DOI: 10.1016/s0040-4039(02)02616-3] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
|
35
|
Magnus P, Gazzard L, Hobson L, Payne AH, Rainey TJ, Westlund N, Lynch V. Synthesis of the Kopsia alkaloids (±)-pauciflorine B, (±)-lahadinine B, (±)-kopsidasine, (±)-kopsidasine-N-oxide, (±)-kopsijasminilam and (±)-11-methoxykopsilongine. Tetrahedron 2002. [DOI: 10.1016/s0040-4020(02)00243-0] [Citation(s) in RCA: 80] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
|
36
|
Kam TS, Subramaniam G, Lim TM. Mersinines A and B and mersiloscine, novel quinolinic alkaloids from Kopsia. Tetrahedron Lett 2001. [DOI: 10.1016/s0040-4039(01)01161-3] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
|
37
|
Husain K, Jantan I, Kamaruddin N, Said IM, Aimi N, Takayama H. Methyl chanofruticosinates from leaves of Kopsia flavida Blume. PHYTOCHEMISTRY 2001; 57:603-606. [PMID: 11394866 DOI: 10.1016/s0031-9422(01)00119-4] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Three new indole alkaloids with methyl chanofruticosinates skeletal system, viz., methyl 12-methoxy-N1-decarbomethoxychanofruticosinate, methyl 12-methoxychanofruticosinate and methyl 11,12-dimethoxychanofruticosinate, in addition to methyl 11,12-methylenedioxy-N1-decarbomethoxychanofruticosinate, have been isolated from the leaves of Kopsia flavida Blume. The structures of these three new indole alkaloids were assigned by NMR spectral data using various 2D-techniques.
Collapse
Affiliation(s)
- K Husain
- Department of Pharmacy, Faculty of Allied Health Sciences, Universiti Kebangsaan Malaysia, Kuala Lumpur.
| | | | | | | | | | | |
Collapse
|
38
|
Magnus P, Hobson LA, Westlund N, Lynch V. Synthesis of (±)-demethoxypauciflorine B and (±)-pauciflorine B from (±)-11,12-demethoxylahadinine B and (±)-lahadinine B, respectively via a peroxycarbanolamine fragmentation reaction. Tetrahedron Lett 2001. [DOI: 10.1016/s0040-4039(00)02218-8] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
|
39
|
Abstract
The hexacyclic ketoester 7, derived from cyclization of racemic minovincine (6), was reduced to two C-19 epimeric alcohols 8 and 9. Stereoelectronically controlled fragmentations of corresponding O-sulfonyl derivatives provided, respectively, the hexacyclic enamine 14 and, after oxidation of the olefin 16, the pentacyclic lactam 17 with a brigehead double bond. Formation of a carbamate, introduction of a second double bond at C-16, and conjugate reductive hydroxylation at C-20, or hydrogenation, gave the title products.
Collapse
Affiliation(s)
- M E Kuehne
- Department of Chemistry, University of Vermont, Burlington 05405, USA.
| | | | | |
Collapse
|
40
|
Abstract
[formula: see text] Racemic minovincine (3), following cyclization, reduction, O-tosylation, fragmentation, and carbamate formation, provided the deoxypauciflorine 12.
Collapse
Affiliation(s)
- M E Kuehne
- Department of Chemistry, University of Vermont, Burlington 05405, USA.
| | | |
Collapse
|
41
|
Magnus P, Gazzard L, Hobson L, Payne AH, Lynch V. Studies on the synthesis of the indole alkaloids pauciflorine A and B. Tetrahedron Lett 1999. [DOI: 10.1016/s0040-4039(99)00882-5] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
|
42
|
Kam TS. Alkaloids from Malaysian Flora. ACTA ACUST UNITED AC 1999. [DOI: 10.1016/s0735-8210(99)80005-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/07/2023]
|
43
|
Structure and biomimetic, electrochemically-mediated semisynthesis of the novel pentacyclic indole danuphylline. Tetrahedron 1999. [DOI: 10.1016/s0040-4020(98)01125-9] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
44
|
Kam TS, Subramaniam G, Sim KM, Yoganathan K, Koyano T, Toyoshima M, Rho MC, Hayashi M, Komiyama K. Reversal of multidrug resistance (MDR) by aspidofractinine-type indole alkaloids. Bioorg Med Chem Lett 1998; 8:2769-72. [PMID: 9873619 DOI: 10.1016/s0960-894x(98)00486-7] [Citation(s) in RCA: 42] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
A series of indole alkaloids of the aspidofractinine-type was assessed for their potential in reversing MDR in vincristine-resistant KB cells. Of the compounds tested, kopsiflorine, kopsamine, pleiocarpine, 11-methoxykopsilongine, lahadinine A and N-methoxycarbonyl-11,12-methylenedioxy-delta 16,17-kopsinine were found to show appreciable activity.
Collapse
Affiliation(s)
- T S Kam
- Department of Chemistry, University of Malaya, Kuala Lumpur, Malaysia
| | | | | | | | | | | | | | | | | |
Collapse
|
45
|
Kam TS, Sim KM, Koyano T, Toyoshima M, Hayashi M, Komiyama K. Conodiparines A-D, new bisindoles from Tabernaemontana. Reversal of vincristine-resistance with cultured cells. Bioorg Med Chem Lett 1998; 8:1693-6. [PMID: 9873417 DOI: 10.1016/s0960-894x(98)00294-7] [Citation(s) in RCA: 41] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
Four new bisindoles of the vobasine-iboga type, conodiparines A-D were obtained from Tabernaemontana corymbosa which showed appreciable activity in reversing resistance in vincristine-resistant KB cells.
Collapse
Affiliation(s)
- T S Kam
- Department of Chemistry, University of Malaya, Kuala Lumpur, Malaysia
| | | | | | | | | | | |
Collapse
|
46
|
Kam TS, Subramaniam G. Oxo-Derivatives of Kopsine- and Rhazinilam-Type Alkaloids from a North BorneoKopsia. ACTA ACUST UNITED AC 1998. [DOI: 10.1080/10575639808041209] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
|
47
|
|
48
|
Kam TS, Yoganathan K, Li HY, Harada N. Tenuisines A - C and tenuiphylline, novel bisindoles from Kopsia tenuis. Tetrahedron 1997. [DOI: 10.1016/s0040-4020(97)00787-4] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
|
49
|
|
50
|
|