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Guo J. Recent advances in the synthesis and activity of analogues of bistetrahydroisoquinoline alkaloids as antitumor agents. Eur J Med Chem 2023; 262:115917. [PMID: 37925762 DOI: 10.1016/j.ejmech.2023.115917] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2023] [Revised: 10/24/2023] [Accepted: 10/25/2023] [Indexed: 11/07/2023]
Abstract
Ecteinascidin 743 (Et-743), also known by the trade name Yondelis®, is the pioneering marine natural product to be successfully developed as an antitumor drug. Moreover, it is the first tetrahydroisoquinoline natural product used clinically for antitumor therapy since Kluepfel, a Canadian scientist, discovered the tetrahydroisoquinoline alkaloid (THIQ) naphthyridinomycin in 1974. Currently, almost a hundred natural products of bistetrahydroisoquinoline type have been reported. Majority of these bistetrahydroisoquinoline alkaloids exhibit diverse pharmacological activities, with some family members portraying potent antitumor activities such as Ecteinascidins, Renieramycins, Saframycins, Jorumycins, among others. Due to the unique chemical structure and exceptional biological activity of these natural alkaloids, coupled with their scarcity in nature, research seeking to provide material basis for further bioactivity research through total synthesis and obtaining compound leads with medicinal value through structural modification, remains a hot topic in the field of antitumor drug R&D. Despite the numerous reviews on the total synthesis of bistetrahydroisoquinoline natural products, comprehensive reviews on their structural modification are apparently scarce. Moreover, structural modification of bioactive natural products to acquire lead compounds with improved pharmaceutical characteristics, is a crucial approach for innovative drug discovery. This paper presents an up-to-date review of both structural modification and activity of bistetrahydroisoquinoline natural products. It highlights how such alkaloids can be used as antitumor lead compounds through careful chemical modifications. This review offers valuable scientific references for pharmaceutical chemists engaged in developing novel antitumor agents based on such alkaloid modifications, as well as those with such a goal in future.
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Affiliation(s)
- Ju Guo
- Key Laboratory of Green Chemical Engineering Process of Ministry of Education/Hubei Key Laboratory of Novel Reactor and Green Chemical Technology, Wuhan Institute of Technology, China; Hubei Key Laboratory of Resources and Chemistry of Chinese Medicine, Hubei University of Chinese Medicine, China; Hubei Key Laboratory of Wudang Local Chinese Medicine Research (Hubei University of Medicine), China.
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2
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Jia J, Wang Y, Zhou Q, Chen R, Chen X. Formal Synthesis of Ecteinascidin 743 from N-Cbz-l-tyrosine. J Org Chem 2023. [PMID: 37463501 DOI: 10.1021/acs.joc.3c00931] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/20/2023]
Abstract
A formal total synthesis of ecteinascidin 743 and lurbinectedin is achieved. Key features involve a Pictet-Spengler cyclization coupling of the tetrahydroisoquinoline and phenylalaninol moieties prepared by a common route with high yield and selectivity, a Parikh-Doering oxidation with good chemoselectivity and functionality tolerance, and a light-mediated A-ring elaboration of pentacyclic methoxyquinone substrates. By the approach, the known advanced intermediate (4-step conversion to Et-743) can be obtained conveniently in 21 total steps from N-Cbz-l-tyrosine.
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Affiliation(s)
- Junhao Jia
- Key Laboratory of Green Chemistry & Technology of Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, PR China
| | - Yue Wang
- Key Laboratory of Green Chemistry & Technology of Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, PR China
| | - Qin Zhou
- Key Laboratory of Green Chemistry & Technology of Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, PR China
| | | | - Xiaochuan Chen
- Key Laboratory of Green Chemistry & Technology of Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, PR China
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4
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Total synthesis of the isoquinolinium metabolite ETM-204 of Trabectidin. MONATSHEFTE FUR CHEMIE 2021. [DOI: 10.1007/s00706-021-02844-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
AbstractEcteinascidin-743 (Trabectidin, Trabectedin®, Yondelis®) is a synthetically obtained pharmaceutical drug originally isolated from a marine tunicate. Trabectedin is used for the chemotherapy of soft-tissue sarcoma and ovarian cancer. The isoquinolinium metabolite ETM-204 has been found in biotransformation and degradation studies of Trabectedin. We report the first total synthesis of ETM-204 and its full spectroscopic characterization confirming the postulated structure. Central elements of the 12-step synthesis starting from 2-methyl-6-nitrophenol are a Cu-mediated conversion of an iodoarene to a phenol, a Skattebøl-formylation, and a modified Pomeranz–Fritsch cyclization to assemble the isoquinoline ring. The pH-dependence of its visual absorbance could be clarified.
Graphic abstract
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Chamni S, Sirimangkalakitti N, Chanvorachote P, Suwanborirux K, Saito N. Chemistry of Renieramycins. Part 19: Semi-Syntheses of 22- O-Amino Ester and Hydroquinone 5- O-Amino Ester Derivatives of Renieramycin M and Their Cytotoxicity against Non-Small-Cell Lung Cancer Cell Lines. Mar Drugs 2020; 18:md18080418. [PMID: 32785022 PMCID: PMC7460379 DOI: 10.3390/md18080418] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2020] [Revised: 07/22/2020] [Accepted: 08/08/2020] [Indexed: 11/16/2022] Open
Abstract
Two new series of synthetic renieramycins including 22-O-amino ester and hydroquinone 5-O-amino ester derivatives of renieramycin M were semi-synthesized and evaluated for their cytotoxicity against the metastatic non-small-cell lung cancer H292 and H460 cell lines. Interestingly, the series of 22-O-amino ester derivatives displayed a potent cytotoxic activity greater than the hydroquinone derivatives. The most cytotoxic derivative of the series was the 22-O-(N-Boc-l-glycine) ester of renieramycin M (5a: IC50 3.56 nM), which showed 7-fold higher potency than renieramycin M (IC50 24.56 nM) and 61-fold more than jorunnamycin A (IC50 217.43 nM) against H292 cells. In addition, 5a exhibited a significantly higher cytotoxic activity than doxorubicin (ca. 100 times). The new semi-synthetic renieramycin derivatives will be further studied and developed as potential cytotoxic agents for non-small-cell lung cancer treatment.
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Affiliation(s)
- Supakarn Chamni
- Natural Products and Nanoparticles Research Unit (NP), Chulalongkorn University, Bangkok 10330, Thailand
- Department of Pharmacognosy and Pharmaceutical Botany, Faculty of Pharmaceutical Sciences, Chulalongkorn University, Pathumwan, Bangkok 10330, Thailand;
- Correspondence: (S.C.); (N.S.); Tel.: +66-218-8357 (S.C.); +81-424-95-8792 (N.S.)
| | - Natchanun Sirimangkalakitti
- Graduate School of Pharmaceutical Sciences, Meiji Pharmaceutical University, 2-522-1 Noshio, Kiyose, Tokyo 204-8588, Japan;
| | - Pithi Chanvorachote
- Department of Pharmacology and Physiology, Faculty of Pharmaceutical Sciences, Chulalongkorn University, Pathumwan, Bangkok 10330, Thailand;
| | - Khanit Suwanborirux
- Department of Pharmacognosy and Pharmaceutical Botany, Faculty of Pharmaceutical Sciences, Chulalongkorn University, Pathumwan, Bangkok 10330, Thailand;
| | - Naoki Saito
- Graduate School of Pharmaceutical Sciences, Meiji Pharmaceutical University, 2-522-1 Noshio, Kiyose, Tokyo 204-8588, Japan;
- Correspondence: (S.C.); (N.S.); Tel.: +66-218-8357 (S.C.); +81-424-95-8792 (N.S.)
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Jia J, Chen R, Jia Y, Gu H, Zhou Q, Chen X. Convergent Formal Synthesis of Ecteinascidin 743. J Org Chem 2019; 84:13696-13706. [PMID: 31523959 DOI: 10.1021/acs.joc.9b01778] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
A concise formal synthesis of ecteinascidin 743 is described. Key features involve the coupling of the multisubstituted tetrahydroisoquinoline and phenylalaninol moieties via a regio- and stereoselective Pictet-Spengler cyclization as well as the subsequent chemoselective MOM protection of the phenol group, which opens a rapid access to the desirable pentacycle. The synthesis successfully delivered the advanced intermediate with the characteristic macrolactone from sesamol in 23 steps.
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Affiliation(s)
- Junhao Jia
- Key Laboratory of Green Chemistry and Technology of Ministry of Education, College of Chemistry , Sichuan University , Chengdu 610064 , P.R. China
| | - Ruijiao Chen
- Jining Medical College , Jining 272067 , P.R. China
| | - Yuanliang Jia
- Key Laboratory of Green Chemistry and Technology of Ministry of Education, College of Chemistry , Sichuan University , Chengdu 610064 , P.R. China
| | - He Gu
- Key Laboratory of Green Chemistry and Technology of Ministry of Education, College of Chemistry , Sichuan University , Chengdu 610064 , P.R. China
| | - Qin Zhou
- Key Laboratory of Green Chemistry and Technology of Ministry of Education, College of Chemistry , Sichuan University , Chengdu 610064 , P.R. China
| | - Xiaochuan Chen
- Key Laboratory of Green Chemistry and Technology of Ministry of Education, College of Chemistry , Sichuan University , Chengdu 610064 , P.R. China
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Albano G, Morelli M, Lissia M, Aronica LA. Synthesis of Functionalised Indoline and Isoquinoline Derivatives through a Silylcarbocyclisation/Desilylation Sequence. ChemistrySelect 2019. [DOI: 10.1002/slct.201900524] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Affiliation(s)
- Gianluigi Albano
- Dipartimento di Chimica e Chimica Industriale; University of Pisa, Via G. Moruzzi 13; 56124 Pisa Italy Fax: (+)390502219260
| | - Martina Morelli
- Dipartimento di Chimica e Chimica Industriale; University of Pisa, Via G. Moruzzi 13; 56124 Pisa Italy Fax: (+)390502219260
| | - Margherita Lissia
- Dipartimento di Chimica e Chimica Industriale; University of Pisa, Via G. Moruzzi 13; 56124 Pisa Italy Fax: (+)390502219260
| | - Laura A. Aronica
- Dipartimento di Chimica e Chimica Industriale; University of Pisa, Via G. Moruzzi 13; 56124 Pisa Italy Fax: (+)390502219260
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Tanifuji R, Koketsu K, Takakura M, Asano R, Minami A, Oikawa H, Oguri H. Chemo-enzymatic Total Syntheses of Jorunnamycin A, Saframycin A, and N-Fmoc Saframycin Y3. J Am Chem Soc 2018; 140:10705-10709. [DOI: 10.1021/jacs.8b07161] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Affiliation(s)
- Ryo Tanifuji
- Department of Applied Chemistry, Graduate School of Engineering, Tokyo University of Agriculture and Technology, 2-24-16 Nakacho, Koganei, Tokyo 184-8588, Japan
| | - Kento Koketsu
- Division of Chemistry, Graduate School of Science, Hokkaido University, North 10 West 8, Sapporo 060-0810, Japan
| | - Michiko Takakura
- Division of Chemistry, Graduate School of Science, Hokkaido University, North 10 West 8, Sapporo 060-0810, Japan
| | - Ryutaro Asano
- Department of Biotechnology and Life Science, Graduate School of Engineering, Tokyo University of Agriculture and Technology, 2-24-16 Nakacho, Koganei, Tokyo 184-8588, Japan
| | - Atsushi Minami
- Division of Chemistry, Graduate School of Science, Hokkaido University, North 10 West 8, Sapporo 060-0810, Japan
| | - Hideaki Oikawa
- Division of Chemistry, Graduate School of Science, Hokkaido University, North 10 West 8, Sapporo 060-0810, Japan
| | - Hiroki Oguri
- Department of Applied Chemistry, Graduate School of Engineering, Tokyo University of Agriculture and Technology, 2-24-16 Nakacho, Koganei, Tokyo 184-8588, Japan
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Chamni S, Sirimangkalakitti N, Chanvorachote P, Saito N, Suwanborirux K. Chemistry of Renieramycins. 17. A New Generation of Renieramycins: Hydroquinone 5-O-Monoester Analogues of Renieramycin M as Potential Cytotoxic Agents against Non-Small-Cell Lung Cancer Cells. JOURNAL OF NATURAL PRODUCTS 2017; 80:1541-1547. [PMID: 28459574 DOI: 10.1021/acs.jnatprod.7b00068] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
A series of hydroquinone 5-O-monoester analogues of renieramycin M were semisynthesized via bishydroquinonerenieramycin M (5) prepared from renieramycin M (1), a major cytotoxic bistetrahydroisoquinolinequinone alkaloid isolated from the Thai blue sponge Xestospongia sp. All 20 hydroquinone 5-O-monoester analogues possessed cytotoxicity with IC50 values in nanomolar concentrations against the H292 and H460 human non-small-cell lung cancer (NSCLC) cell lines. The improved cytotoxicity toward the NSCLC cell lines was observed from the 5-O-monoester analogues such as 5-O-acetyl ester 6a and 5-O-propanoyl ester 7e, which exhibited 8- and 10-fold increased cytotoxicity toward the H292 NSCLC cell line (IC50 3.0 and 2.3 nM, respectively), relative to 1 (IC50 24 nM). Thus, the hydroquinone 5-O-monoester analogues are a new generation of the renieramycins to be further developed as potential marine-derived drug candidates for lung cancer treatment.
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Affiliation(s)
| | | | | | - Naoki Saito
- Graduate School of Pharmaceutical Sciences, Meiji Pharmaceutical University , 2-522-1 Noshio, Kiyose, Tokyo 204-8588, Japan
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Yokoya M, Toyoshima R, Suzuki T, Le VH, Williams RM, Saito N. Stereoselective Total Synthesis of (−)-Renieramycin T. J Org Chem 2016; 81:4039-47. [DOI: 10.1021/acs.joc.6b00327] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Masashi Yokoya
- Graduate
School of Pharmaceutical Sciences, Meiji Pharmaceutical University, 2-522-1 Noshio, Kiyose, Tokyo 204-8588, Japan
| | - Ryoko Toyoshima
- Graduate
School of Pharmaceutical Sciences, Meiji Pharmaceutical University, 2-522-1 Noshio, Kiyose, Tokyo 204-8588, Japan
| | - Toshihiro Suzuki
- Graduate
School of Pharmaceutical Sciences, Meiji Pharmaceutical University, 2-522-1 Noshio, Kiyose, Tokyo 204-8588, Japan
| | - Vy H. Le
- Department
of Chemistry, Colorado State University, Fort Collins, Colorado 80523, United States
- The University of Colorado Cancer Center, Aurora, Colorado 80045, United States
| | - Robert M. Williams
- Department
of Chemistry, Colorado State University, Fort Collins, Colorado 80523, United States
- The University of Colorado Cancer Center, Aurora, Colorado 80045, United States
| | - Naoki Saito
- Graduate
School of Pharmaceutical Sciences, Meiji Pharmaceutical University, 2-522-1 Noshio, Kiyose, Tokyo 204-8588, Japan
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Davies SG, Fletcher AM, Frost AB, Kennedy MS, Roberts PM, Thomson JE. Trading N and O. Part 3: Synthesis of 1,2,3,4-tetrahydroisoquinolines from α-hydroxy-β-amino esters. Tetrahedron 2016. [DOI: 10.1016/j.tet.2016.03.008] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Jia J, Chen R, Liu H, Li X, Jia Y, Chen X. Asymmetric synthesis of (−)-renieramycin T. Org Biomol Chem 2016; 14:7334-44. [DOI: 10.1039/c6ob01064d] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A nonclassical renieramycin with a similar A-ring to ecteinascidin, (−)-renieramycin T, is synthesized through a convergent approach featuring a regio- and stereoselective condensation of isoquinoline and trisubstituted phenylalaninol partners. This practical strategy via the bis-THIQ intermediate will open a rapid access to the hybrid-type renieramycins, as well as ecteinascidins and their analogues.
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Affiliation(s)
- Junhao Jia
- Key Laboratory of Green Chemistry & Technology of Ministry of Education
- College of Chemistry
- Sichuan University
- Chengdu 610064
- PR China
| | - Ruijiao Chen
- Key Laboratory of Green Chemistry & Technology of Ministry of Education
- College of Chemistry
- Sichuan University
- Chengdu 610064
- PR China
| | - Hao Liu
- Key Laboratory of Green Chemistry & Technology of Ministry of Education
- College of Chemistry
- Sichuan University
- Chengdu 610064
- PR China
| | - Xiong Li
- Key Laboratory of Green Chemistry & Technology of Ministry of Education
- College of Chemistry
- Sichuan University
- Chengdu 610064
- PR China
| | - Yuanliang Jia
- Key Laboratory of Green Chemistry & Technology of Ministry of Education
- College of Chemistry
- Sichuan University
- Chengdu 610064
- PR China
| | - Xiaochuan Chen
- Key Laboratory of Green Chemistry & Technology of Ministry of Education
- College of Chemistry
- Sichuan University
- Chengdu 610064
- PR China
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Du E, Dong W, Guan B, Pan X, Yan Z, Li L, Wang N, Liu Z. Asymmetric total synthesis of three stereoisomers of (−)-renieramycin G and their cytotoxic activities. Tetrahedron 2015. [DOI: 10.1016/j.tet.2015.04.064] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Imperatore C, Aiello A, D'Aniello F, Senese M, Menna M. Alkaloids from marine invertebrates as important leads for anticancer drugs discovery and development. Molecules 2014; 19:20391-423. [PMID: 25490431 PMCID: PMC6270949 DOI: 10.3390/molecules191220391] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2014] [Revised: 11/07/2014] [Accepted: 11/27/2014] [Indexed: 11/27/2022] Open
Abstract
The present review describes research on novel natural antitumor alkaloids isolated from marine invertebrates. The structure, origin, and confirmed cytotoxic activity of more than 130 novel alkaloids belonging to several structural families (indoles, pyrroles, pyrazines, quinolines, and pyridoacridines), together with some of their synthetic analogs, are illustrated. Recent discoveries concerning the current state of the potential and/or development of some of them as new drugs, as well as the current knowledge regarding their modes of action, are also summarized. A special emphasis is given to the role of marine invertebrate alkaloids as an important source of leads for anticancer drug discovery.
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Affiliation(s)
- Concetta Imperatore
- The NeaNat Group, Department of Pharmacy, University of Naples "Federico II", Via D. Montesano 49, Napoli 80131, Italy.
| | - Anna Aiello
- The NeaNat Group, Department of Pharmacy, University of Naples "Federico II", Via D. Montesano 49, Napoli 80131, Italy.
| | - Filomena D'Aniello
- The NeaNat Group, Department of Pharmacy, University of Naples "Federico II", Via D. Montesano 49, Napoli 80131, Italy.
| | - Maria Senese
- The NeaNat Group, Department of Pharmacy, University of Naples "Federico II", Via D. Montesano 49, Napoli 80131, Italy.
| | - Marialuisa Menna
- The NeaNat Group, Department of Pharmacy, University of Naples "Federico II", Via D. Montesano 49, Napoli 80131, Italy.
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Liu H, Chen R, Chen X. A rapid and efficient access to renieramycin-type alkaloids featuring a temperature-dependent stereoselective cyclization. Org Biomol Chem 2014; 12:1633-40. [DOI: 10.1039/c3ob42209g] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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17
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González JF, Ortín I, de la Cuesta E, Menéndez JC. Privileged scaffolds in synthesis: 2,5-piperazinediones as templates for the preparation of structurally diverse heterocycles. Chem Soc Rev 2012; 41:6902-15. [DOI: 10.1039/c2cs35158g] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Nakanishi M, Minard C, Retailleau P, Cariou K, Dodd RH. Copper(I) Catalyzed Regioselective Asymmetric Alkoxyamination of Aryl Enamide Derivatives. Org Lett 2011; 13:5792-5. [DOI: 10.1021/ol202367d] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Masafumi Nakanishi
- Institut de Chimie des Substances Naturelles, UPR 2301 CNRS, Avenue de la Terrasse, 91198 Gif-Sur-Yvette, France
| | - Corinne Minard
- Institut de Chimie des Substances Naturelles, UPR 2301 CNRS, Avenue de la Terrasse, 91198 Gif-Sur-Yvette, France
| | - Pascal Retailleau
- Institut de Chimie des Substances Naturelles, UPR 2301 CNRS, Avenue de la Terrasse, 91198 Gif-Sur-Yvette, France
| | - Kevin Cariou
- Institut de Chimie des Substances Naturelles, UPR 2301 CNRS, Avenue de la Terrasse, 91198 Gif-Sur-Yvette, France
| | - Robert H. Dodd
- Institut de Chimie des Substances Naturelles, UPR 2301 CNRS, Avenue de la Terrasse, 91198 Gif-Sur-Yvette, France
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Huck L, González JF, de la Cuesta E, Menéndez JC, Avendaño C. 1,3-Dipolar cycloadditions from tricyclic hemiaminals. Synthesis of the quinocarcin core through catalyst-free generation of azomethine ylides. Org Biomol Chem 2011; 9:6271-7. [DOI: 10.1039/c1ob05181d] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Smith LHS, Nguyen TT, Sneddon HF, Procter DJ. Synthesis of the ABH rings of ecteinascidin 597 using a connective Pummerer-type cyclisation. Chem Commun (Camb) 2011; 47:10821-3. [DOI: 10.1039/c1cc13992d] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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