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Ponce MB, Rodríguez ET, Flader A, Ehlers P, Langer P. Synthesis of thieno[2,3- h]-/[3,2- h]quinolines and thieno[2,3- f] quinolines by Brønsted acid mediated cycloisomerisation. Org Biomol Chem 2020; 18:6531-6536. [PMID: 32766664 DOI: 10.1039/d0ob01194k] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Several thieno[2,3-h]-/[3,2-h]- and [2,3-f]quinolines have been synthesised from 2,3-dihalogenated pyridines or -quinolines by site-selective Pd catalysed cross-coupling reactions and Brønsted acid mediated cycloisomerisations as the final key step. This newly developed synthetic strategy is used in a modular way to synthesize diverse regioisomeric derivatives, tolerates various functional groups, and proceeds with high selectivity, and the desired final products have been isolated in high overall yields.
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Affiliation(s)
- Marian Blanco Ponce
- Universität Rostock, Institut für Chemie, Albert-Einstein-Str. 3a, 18059 Rostock, Germany. and University of Granma, Centre for Study of Applied Chemistry, Carretera Manzanillo Km 17½, 85100, Bayamo, Cuba
| | - Eugenio Torres Rodríguez
- Universität Rostock, Institut für Chemie, Albert-Einstein-Str. 3a, 18059 Rostock, Germany. and University of Granma, Centre for Study of Applied Chemistry, Carretera Manzanillo Km 17½, 85100, Bayamo, Cuba
| | - Anika Flader
- Universität Rostock, Institut für Chemie, Albert-Einstein-Str. 3a, 18059 Rostock, Germany.
| | - Peter Ehlers
- Universität Rostock, Institut für Chemie, Albert-Einstein-Str. 3a, 18059 Rostock, Germany. and Leibniz Institut für Katalyse, Albert-Einstein-Str. 29a, 18059 Rostock, Germany
| | - Peter Langer
- Universität Rostock, Institut für Chemie, Albert-Einstein-Str. 3a, 18059 Rostock, Germany. and Leibniz Institut für Katalyse, Albert-Einstein-Str. 29a, 18059 Rostock, Germany
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2
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Liu M, Liu CF, Zhang J, Xu YJ, Dong L. Metal-free tandem reaction synthesis of spiro-cyclopropyl fused pyrazolin-5-one derivatives. Org Chem Front 2019. [DOI: 10.1039/c8qo01378k] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
A highly efficient cascade annulation approach was developed for the synthesis of novel spiro-cyclopropyl fused pyrazolin-5-ones from pyrazole-3-ketone substrates and two-component sulfur ylides in an acidic environment.
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Affiliation(s)
- Man Liu
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry
- West China School of Pharmacy
- Sichuan University
- Chengdu 610041
- China
| | - Chen-Fei Liu
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry
- West China School of Pharmacy
- Sichuan University
- Chengdu 610041
- China
| | - Jing Zhang
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry
- West China School of Pharmacy
- Sichuan University
- Chengdu 610041
- China
| | - Yan-Jun Xu
- College of Chemistry and Material Science
- Sichuan Normal University
- Chengdu
- China
| | - Lin Dong
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry
- West China School of Pharmacy
- Sichuan University
- Chengdu 610041
- China
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3
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Chanda PB, Boyle KE, Brody DM, Shukla V, Boger DL. Synthesis and evaluation of duocarmycin SA analogs incorporating the methyl 1,2,8,8a-tetrahydrocyclopropa[c]imidazolo[4,5-e]indol-4-one-6-carboxylate (CImI) alkylation subunit. Bioorg Med Chem 2016; 24:4779-4786. [PMID: 27221071 DOI: 10.1016/j.bmc.2016.04.050] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2016] [Revised: 04/18/2016] [Accepted: 04/23/2016] [Indexed: 10/21/2022]
Abstract
The design, synthesis, and evaluation of methyl 1,2,8,8a-tetrahydrocyclopropa[c]imidazolo[4,5-e]indol-4-one-6-carboxylate (CImI) derivatives are detailed representing analogs of duocarmycin SA and yatakemycin containing an imidazole replacement for the fused pyrrole found in the DNA alkylation subunit.
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Affiliation(s)
- Prem B Chanda
- Department of Chemistry and the Skaggs Institute for Chemical Biology, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA 92037, USA
| | - Kristopher E Boyle
- Department of Chemistry and the Skaggs Institute for Chemical Biology, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA 92037, USA
| | - Daniel M Brody
- Department of Chemistry and the Skaggs Institute for Chemical Biology, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA 92037, USA
| | - Vyom Shukla
- Department of Chemistry and the Skaggs Institute for Chemical Biology, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA 92037, USA
| | - Dale L Boger
- Department of Chemistry and the Skaggs Institute for Chemical Biology, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA 92037, USA.
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4
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El-Deeb IM, Rose FJ, Healy PC, von Itzstein M. A versatile synthesis of "tafuramycin A": a potent anticancer and parasite attenuating agent. Org Biomol Chem 2016; 12:4260-4. [PMID: 24838868 DOI: 10.1039/c4ob00842a] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
An improved and versatile synthesis of tafuramycin A, a potent anticancer and parasite-attenuating agent, is reported. The three major improvements that optimized yield, simplified purification and allowed the synthesis of more versatile duocarmycin analogues are: a first-time reported regioselective bromination using DMAP as catalyst; the control of the aryl radical alkene cyclization step to prevent the dechlorination side reaction; and the design of a new protection/deprotection method to avoid furan double bond reduction during the classical O-benzyl deprotection in the final step. This alternative protection/deprotection strategy provides ready access to duocarmycin seco-analogues that carry labile functionalities under reducing reaction conditions. Tafuramycin A (3) was prepared in either 8 steps from intermediate 6 or 7 steps from intermediate 17 in 52% or 37% yield respectively. Our strategy provides a significant improvement on the original procedure (11% overall yield) and greater versatility for analogue development.
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Affiliation(s)
- Ibrahim M El-Deeb
- Institute for Glycomics, Griffith University, Gold Coast Campus, Queensland, 4222, Australia.
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5
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Laloo BM, Mecadon H, Rohman MR, Kharbangar I, Kharkongor I, Rajbangshi M, Nongkhlaw R, Myrboh B. Reaction of Selenium Dioxide with Aromatic Ketones in the Presence of Boron Triflouride Etherate: A Protocol for the Synthesis of Triarylethanones. J Org Chem 2011; 77:707-12. [DOI: 10.1021/jo201985n] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Badaker M. Laloo
- Department of Chemistry, North-Eastern Hill University, Shillong 793022, Meghalaya, India
| | - Hormi Mecadon
- Department of Chemistry, North-Eastern Hill University, Shillong 793022, Meghalaya, India
| | - Md. Rumum Rohman
- Department of Chemistry, North-Eastern Hill University, Shillong 793022, Meghalaya, India
| | - Iadeishisha Kharbangar
- Department of Chemistry, North-Eastern Hill University, Shillong 793022, Meghalaya, India
| | - Icydora Kharkongor
- Department of Chemistry, North-Eastern Hill University, Shillong 793022, Meghalaya, India
| | - Mantu Rajbangshi
- Department of Chemistry, North-Eastern Hill University, Shillong 793022, Meghalaya, India
| | - Rishanlang Nongkhlaw
- Department of Chemistry, North-Eastern Hill University, Shillong 793022, Meghalaya, India
| | - Bekington Myrboh
- Department of Chemistry, North-Eastern Hill University, Shillong 793022, Meghalaya, India
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Bellina F, Rossi R. Transition metal-catalyzed direct arylation of substrates with activated sp3-hybridized C-H bonds and some of their synthetic equivalents with aryl halides and pseudohalides. Chem Rev 2010; 110:1082-146. [PMID: 19610600 DOI: 10.1021/cr9000836] [Citation(s) in RCA: 769] [Impact Index Per Article: 54.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Fabio Bellina
- Dipartimento di Chimica e Chimica Industriale, University of Pisa, Via Risorgimento 35, 56125 Pisa, Italy
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Johansson CCC, Colacot TJ. Metal-catalyzed alpha-arylation of carbonyl and related molecules: novel trends in C-C bond formation by C-H bond functionalization. Angew Chem Int Ed Engl 2010; 49:676-707. [PMID: 20058282 DOI: 10.1002/anie.200903424] [Citation(s) in RCA: 597] [Impact Index Per Article: 42.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Alpha-arylated carbonyl compounds are commonly occurring motifs in biologically interesting molecules and are therefore of high interest to the pharmaceutical industry. Conventional procedures for their synthesis often result in complications in scale-up, such as the use of stoichiometric amounts of toxic reagents and harsh reaction conditions. Over the last decade, significant efforts have been directed towards the development of metal-catalyzed alpha-arylations of carbonyl compounds as an alternative synthetic approach that operates under milder conditions. This Review summarizes the developments in this area to date, with a focus on how the substrate scope has been expanded through selection of the most appropriate synthetic method, such as the careful choice of ligands, precatalysts, bases, and reaction conditions.
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Johansson C, Colacot T. Metallkatalysierte α-Arylierungen von Carbonylen und verwandten Molekülen: aktuelle Trends bei der C-C-Kupplung über C-H-Funktionalisierung. Angew Chem Int Ed Engl 2010. [DOI: 10.1002/ange.200903424] [Citation(s) in RCA: 226] [Impact Index Per Article: 16.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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9
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Qian H, Cui X, Tang M, Liu C, Liu C, Wu Y. Synthesis and structure of heteroannular cyclopalladated chiral ferrocenylimines: theoretical interpretation of the cyclopalladated complexes based on density functional calculations. NEW J CHEM 2009. [DOI: 10.1039/b816826a] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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10
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Tichenor MS, MacMillan KS, Stover JS, Wolkenberg SE, Pavani MG, Zanella L, Zaid AN, Spalluto G, Rayl TJ, Hwang I, Baraldi PG, Boger DL. Rational design, synthesis, and evaluation of key analogues of CC-1065 and the duocarmycins. J Am Chem Soc 2007; 129:14092-9. [PMID: 17948994 DOI: 10.1021/ja073989z] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The design, synthesis, and evaluation of a predictably more potent analogue of CC-1065 entailing the substitution replacement of a single skeleton atom in the alkylation subunit are disclosed and were conducted on the basis of design principles that emerged from a fundamental parabolic relationship between chemical reactivity and cytotoxic potency. Consistent with projections, the 7-methyl-1,2,8,8a-tetrahydrocyclopropa[c]thieno[3,2-e]indol-4-one (MeCTI) alkylation subunit and its isomer 6-methyl-1,2,8,8a-tetrahydrocyclopropa[c]thieno[2,3-e]indol-4-one (iso-MeCTI) were found to be 5-6 times more stable than the MeCPI alkylation subunit found in CC-1065 and slightly more stable than even the DSA alkylation subunit found in duocarmycin SA, placing it at the point of optimally balanced stability and reactivity for this class of antitumor agents. Their incorporation into the key analogues of the natural products provided derivatives that surpassed the potency of MeCPI derivatives (3-10-fold), matching or slightly exceeding the potency of the corresponding DSA derivatives, consistent with projections made on the basis of the parabolic relationship. Notable of these, MeCTI-TMI proved to be as potent as or slightly more potent than the natural product duocarmycin SA (DSA-TMI, IC50 = 5 vs 8 pM), and MeCTI-PDE2 proved to be 3-fold more potent than the natural product CC-1065 (MeCPI-PDE2, IC50 = 7 vs 20 pM). Both exhibited efficiencies of DNA alkylation that correlate with this enhanced potency without impacting the intrinsic selectivity characteristic of this class of antitumor agents.
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Affiliation(s)
- Mark S Tichenor
- Department of Chemistry and the Skaggs Institute for Chemical Biology, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, California 92037, USA
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11
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Muratake H, Natsume M. Synthetic study of hetisine-type aconite alkaloids. Part 1: Preparation of tetracyclic intermediate containing the C14–C20 bond. Tetrahedron 2006. [DOI: 10.1016/j.tet.2006.04.084] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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12
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Palladium-catalyzed intramolecular α-arylation of aliphatic ketone, formyl, and nitro groups. Tetrahedron 2004. [DOI: 10.1016/j.tet.2004.09.112] [Citation(s) in RCA: 54] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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13
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Christophersen C, Begtrup M, Ebdrup S, Petersen H, Vedsø P. Synthesis of 2,3-Substituted Thienylboronic Acids and Esters. J Org Chem 2003; 68:9513-6. [PMID: 14629185 DOI: 10.1021/jo034919n] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A noncryogenic protocol for the synthesis of 2-substituted 3-thienylboronic acids and esters as well as 3-substituted 2-thienylboronic acids and esters has been developed. Electrophiles were introduced regiospecifically in the 2-position of 2,3-dibromothiophene and in the 3-position of 2-bromo-3-iodothiophene by halogen-magnesium exchange followed by quenching with electrophiles. Palladium-catalyzed borylation of the 2,3-substituted halothiophenes with pinacolborane and P(t-Bu)3 as ligand for Pd produced 9 and 10. The borylation protocol was tolerated by a range of functional groups; however, strongly electron-withdrawing substituents decreased the stability of the thienylboronic acids and esters.
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Churruca F, SanMartin R, Tellitu I, Domínguez E. Palladium-catalyzed arylation of ketone enolates: an expeditious entry to tamoxifen-related 1,2,2-triarylethanones. Org Lett 2002; 4:1591-4. [PMID: 11975636 DOI: 10.1021/ol025811h] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
[reaction: see text]. After a rigorous study on the effect of several catalytic systems, a simple, high yielding procedure for the preparation of 1,2,2-triarylethanones, skeletal analogues of tamoxifen, is presented. Apart from the economic and environmental advantages involved, this palladium-catalyzed arylation of deoxybenzoin enolates features a lack of ortho-arylation side reactions. In addition, an alternative approach from acetophenones to the target triarylethanone system is also announced.
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Affiliation(s)
- Fátima Churruca
- Kimika Organikoa II Saila, Zientzi Fakultatea, Euskal Herriko Unibertsitatea, P.O. Box 644, 48080 Bilbao, Spain
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