101
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Menjo Y, Hamajima A, Sasaki N, Hamada Y. Asymmetric Aziridination of Cyclic Enones Using Chiral Diamine Catalysts and Its Application to the Total Synthesis of (−)-Agelastatin A. Org Lett 2011; 13:5744-7. [DOI: 10.1021/ol2023054] [Citation(s) in RCA: 60] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Yasuhiro Menjo
- Graduate School of Pharmaceutical Sciences, Chiba University, Yayoi-cho, Inage-ku, Chiba 263-8522, Japan
| | - Akinari Hamajima
- Graduate School of Pharmaceutical Sciences, Chiba University, Yayoi-cho, Inage-ku, Chiba 263-8522, Japan
| | - Neri Sasaki
- Graduate School of Pharmaceutical Sciences, Chiba University, Yayoi-cho, Inage-ku, Chiba 263-8522, Japan
| | - Yasumasa Hamada
- Graduate School of Pharmaceutical Sciences, Chiba University, Yayoi-cho, Inage-ku, Chiba 263-8522, Japan
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102
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Linares D, Bottzeck O, Pereira O, Praud-Tabariès A, Blache Y. Designing 2-aminoimidazole alkaloids analogs with anti-biofilm activities: structure-activities relationships of polysubstituted triazoles. Bioorg Med Chem Lett 2011; 21:6751-5. [PMID: 21982498 DOI: 10.1016/j.bmcl.2011.09.050] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2011] [Revised: 09/14/2011] [Accepted: 09/14/2011] [Indexed: 11/16/2022]
Abstract
In order to discover novel probes that may help in the investigation and the control of bacterial biofilms, we have designed a library of triazole-based analogs of 2-aminoimidazole marine alkaloids: naamine A and isonaamine A. Twenty-two compounds were screened for their biofilm inhibitory activity against two strains of Gram-negative bacteria. Four compounds were shown to act as non-toxic inhibitors of biofilm development without effect on bacterial growth even at high concentrations (100 μM).
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Affiliation(s)
- D Linares
- Laboratoire MAPIEM, EA 4323, UFR Sciences et Techniques, Université du Sud Toulon-Var, 83957 La Garde cedex, France
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103
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Abstract
We describe herein an asymmetric synthesis of ageliferin. A Mn(III)-mediated oxidative radical cyclization reaction was used as the key step to construct the core skeleton of this pyrrole-imidazole dimer. This approach resembles the biogenic [4 + 2] dimerization in an intramolecular fashion.
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Affiliation(s)
- Xiao Wang
- Division of Chemistry, Department of Biochemistry, The University of Texas Southwestern Medical Center at Dallas, 5323 Harry Hines Boulevard, Dallas, Texas 75390-9038, United States
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104
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Al-Mourabit A, Zancanella MA, Tilvi S, Romo D. Biosynthesis, asymmetric synthesis, and pharmacology, including cellular targets, of the pyrrole-2-aminoimidazole marine alkaloids. Nat Prod Rep 2011; 28:1229-60. [PMID: 21556392 PMCID: PMC5596510 DOI: 10.1039/c0np00013b] [Citation(s) in RCA: 161] [Impact Index Per Article: 12.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
The pyrrole-2-aminoimidazole (P-2-AI) alkaloids are a growing family of marine alkaloids, now numbering well over 150 members, with high topographical and biological information content. Their intriguing structural complexity, rich and compact stereochemical content, high N to C ratio (~1 : 2), and increasingly studied biological activities are attracting a growing number of researchers from numerous disciplines world-wide. This review surveys advances in this area with a focus on the structural diversity, biosynthetic hypotheses with increasing, but still rare, verifying experimental studies, asymmetric syntheses, and biological studies, including cellular target receptor isolation studies, of this stimulating and exciting alkaloid family.
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Affiliation(s)
- Ali Al-Mourabit
- Centre de Recherche de Gif-sur-Yvette, Institut de Chimie des Substances Naturelles, UPR 2301, CNRS, Avenue de la Terrasse, 91198 Gif-sur-Yvette, France
| | | | - Supriya Tilvi
- Bio-organic Chemistry laboratory, National Institute of Oceanography, Dona Paula, Goa, India, 403 004
| | - Daniel Romo
- Department of Chemistry, Texas A&M Universtiy College Station, TX 77842-3012
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105
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Ermolat'ev DS, Bariwal JB, Steenackers HPL, De Keersmaecker SCJ, Van der Eycken EV. Concise and diversity-oriented route toward polysubstituted 2-aminoimidazole alkaloids and their analogues. Angew Chem Int Ed Engl 2011; 49:9465-8. [PMID: 20963737 DOI: 10.1002/anie.201004256] [Citation(s) in RCA: 130] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Denis S Ermolat'ev
- Laboratory for Organic and Microwave-Assisted Chemistry, Katholieke Universiteit Leuven, Celestijnenlaan 200F, 3001 Leuven, Belgium
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106
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Trost BM, Osipov M, Dong G. Palladium-catalyzed dynamic kinetic asymmetric transformations of vinyl aziridines with nitrogen heterocycles: rapid access to biologically active pyrroles and indoles. J Am Chem Soc 2011; 132:15800-7. [PMID: 20949972 DOI: 10.1021/ja1071509] [Citation(s) in RCA: 187] [Impact Index Per Article: 14.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
We report that nitrogen heterocycles can serve as competent nucleophiles in the palladium-catalyzed dynamic kinetic asymmetric alkylation of vinyl aziridines. The resulting alkylated products were obtained with high regio-, chemo-, and enantioselectivity. Both substituted 1H-pyrroles and 1H-indoles were successfully employed to give exclusively the branched N-alkylated products. The synthetic utility of this process was demonstrated by applying this method to the preparation of several medicinal chemistry lead compounds and bromopyrrole alkaloids including longamide B, longamide B methyl ester, hanishin, agesamides A and B, and cyclooroidin.
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Affiliation(s)
- Barry M Trost
- Department of Chemistry, Stanford University, Stanford, California 94305-5080, United States.
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107
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Bhandari MR, Yousufuddin M, Lovely CJ. Diversity-oriented approach to pyrrole-imidazole alkaloid frameworks. Org Lett 2011; 13:1382-5. [PMID: 21338082 DOI: 10.1021/ol200067e] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
An exploration of imidazolylpropargyl amides as linchpin synthons for the construction of a diverse array of heterocyclic frameworks, many of which are related to those found in the oroidin derived alkaloids, is described. One such intermediate has been used in a formal total synthesis of cyclooroidin.
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Affiliation(s)
- Manojkumar R Bhandari
- Department of Chemistry and Biochemistry, The University of Texas at Arlington, Arlington, Texas 76019, United States
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108
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Mukherjee S, Sivappa R, Yousufuddin M, Lovely CJ. Asymmetric total synthesis of ent-cyclooroidin. Org Lett 2011; 12:4940-3. [PMID: 20929213 DOI: 10.1021/ol1020916] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
An enantiospecific total synthesis of the pyrrole-imidazole natural product cyclooroidin from histidine is described. The key N1-C9 bond is constructed through an intramolecular SN2-type of reaction of a chloro ester. Subsequent imidazole azidation at the 2-position, pyrrole bromination, azide reduction, and deprotection leads to the completion of the synthesis.
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Affiliation(s)
- Sabuj Mukherjee
- Department of Chemistry and Biochemistry, The University of Texas at Arlington, Arlington, Texas 76019, United States
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109
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He Y, Krishnamoorthy P, Lima HM, Chen Y, Wu H, Sivappa R, Dias HVR, Lovely CJ. Intramolecular Diels–Alder chemistry of 4-vinylimidazoles. Org Biomol Chem 2011; 9:2685-701. [DOI: 10.1039/c0ob00657b] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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110
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111
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Lee SJ, Youn SH, Cho CW. Organocatalytic enantioselective formal synthesis of bromopyrrole alkaloids via aza-Michael addition. Org Biomol Chem 2011; 9:7734-41. [DOI: 10.1039/c1ob06078c] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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112
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Kim YM, Lee S, Kim SH, Kim KH, Kim JN. Synthesis of fully-substituted alkenylimidazoles from N-(cyanoalkyl)amides via the In-mediated allylation of nitrile and dehydrative cyclization cascade. Tetrahedron Lett 2010. [DOI: 10.1016/j.tetlet.2010.09.016] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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113
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Ermolat'ev DS, Bariwal JB, Steenackers HPL, De Keersmaecker SCJ, Van der Eycken EV. Concise and Diversity-Oriented Route toward Polysubstituted 2-Aminoimidazole Alkaloids and Their Analogues. Angew Chem Int Ed Engl 2010. [DOI: 10.1002/ange.201004256] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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114
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Maechling S, Good J, Lindell SD. Synthesis of a Solid-Phase Amino Imidazotriazine Library via Palladium Catalyzed Direct Arylation. ACTA ACUST UNITED AC 2010; 12:818-21. [DOI: 10.1021/cc1001617] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Simon Maechling
- Bayer CropScience GmbH, Werk Höchst, G836, D-65926, Frankfurt am Main, Germany
| | - James Good
- Bayer CropScience GmbH, Werk Höchst, G836, D-65926, Frankfurt am Main, Germany
| | - Stephen D. Lindell
- Bayer CropScience GmbH, Werk Höchst, G836, D-65926, Frankfurt am Main, Germany
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115
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Pseudoceratinazole A: a novel bromotyrosine alkaloid from the Australian sponge Pseudoceratina sp. Tetrahedron Lett 2010. [DOI: 10.1016/j.tetlet.2010.07.052] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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116
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Jacobi N, Lindel T. Assembly of the Bis(imidazolyl)propene Core of Nagelamides C and S by Double Grignard Reaction. European J Org Chem 2010. [DOI: 10.1002/ejoc.201000625] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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117
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A novel and an efficient catalyst for one-pot synthesis of 2,4,5-trisubstituted imidazoles by using microwave irradiation under solvent-free conditions. J CHEM SCI 2010. [DOI: 10.1007/s12039-010-0051-6] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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118
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Shen H, Xie Z. Atom-Economical Synthesis of N-Heterocycles via Cascade Inter-/Intramolecular C−N Bond-Forming Reactions Catalyzed by Ti Amides. J Am Chem Soc 2010; 132:11473-80. [DOI: 10.1021/ja101796k] [Citation(s) in RCA: 95] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Hao Shen
- Department of Chemistry and Center of Novel Functional Molecules, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong, China
| | - Zuowei Xie
- Department of Chemistry and Center of Novel Functional Molecules, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong, China
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119
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Affiliation(s)
- Tanja Gaich
- Department of Chemistry, The Scripps Research Institute, 10550 North Torrey Pines Road, 92037 La Jolla, California
| | - Phil S. Baran
- Department of Chemistry, The Scripps Research Institute, 10550 North Torrey Pines Road, 92037 La Jolla, California
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120
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Ouairy C, Michel P, Delpech B, Crich D, Marazano C. Synthesis of N-Acyl-5-aminopenta-2,4-dienals via Base-Induced Ring-Opening of N-Acylated Furfurylamines: Scope and Limitations. J Org Chem 2010; 75:4311-4. [DOI: 10.1021/jo100634z] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Cécile Ouairy
- Centre de Recherche de Gif, Institut de Chimie des Substances Naturelles, CNRS, Avenue de la Terrasse, 91198 Gif-sur-Yvette Cedex, France
| | - Patrick Michel
- Centre de Recherche de Gif, Institut de Chimie des Substances Naturelles, CNRS, Avenue de la Terrasse, 91198 Gif-sur-Yvette Cedex, France
| | - Bernard Delpech
- Centre de Recherche de Gif, Institut de Chimie des Substances Naturelles, CNRS, Avenue de la Terrasse, 91198 Gif-sur-Yvette Cedex, France
| | - David Crich
- Centre de Recherche de Gif, Institut de Chimie des Substances Naturelles, CNRS, Avenue de la Terrasse, 91198 Gif-sur-Yvette Cedex, France
| | - Christian Marazano
- Centre de Recherche de Gif, Institut de Chimie des Substances Naturelles, CNRS, Avenue de la Terrasse, 91198 Gif-sur-Yvette Cedex, France
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121
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Wang YG, Morinaka BI, Reyes JCP, Wolff JH, Romo D, Molinski TF. Synthesis of 7-(15)N-Oroidin and evaluation of utility for biosynthetic studies of pyrrole-imidazole alkaloids by microscale (1)H-(15)N HSQC and FTMS. JOURNAL OF NATURAL PRODUCTS 2010; 73:428-34. [PMID: 20095632 PMCID: PMC3544367 DOI: 10.1021/np900638e] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Numerous marine-derived pyrrole-imidazole alkaloids (PIAs), ostensibly derived from the simple precursor oroidin, 1a, have been reported and have garnered intense synthetic interest due to their complex structures and in some cases biological activity; however very little is known regarding their biosynthesis. We describe a concise synthesis of 7-(15)N-oroidin (1d) from urocanic acid and a direct method for measurement of (15)N incorporation by pulse labeling and analysis by 1D (1)H-(15)N HSQC NMR and FTMS. Using a mock pulse labeling experiment, we estimate the limit of detection (LOD) for incorporation of newly biosynthesized PIA by 1D (1)H-(15)N HSQC to be 0.96 microg equivalent of (15)N-oroidin (2.4 nmole) in a background of 1500 microg of unlabeled oroidin (about 1 part per 1600). 7-(15)N-Oroidin will find utility in biosynthetic feeding experiments with live sponges to provide direct information to clarify the pathways leading to more complex pyrrole-imidazole alkaloids.
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Affiliation(s)
| | | | | | | | - Daniel Romo
- To whom correspondence should be addressed: Tel: +1 (858) 534-7115. Fax: +1 (858) 822-0386. . Tel: +1 (979) 845-9571. Fax: +1 (979) 862-4880.
| | - Tadeusz F. Molinski
- To whom correspondence should be addressed: Tel: +1 (858) 534-7115. Fax: +1 (858) 822-0386. . Tel: +1 (979) 845-9571. Fax: +1 (979) 862-4880.
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122
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Jessen HJ, Gademann K. Total Synthesis of the Marine Alkaloid Palau’amine. Angew Chem Int Ed Engl 2010; 49:2972-4. [DOI: 10.1002/anie.201000479] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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123
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124
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Seiple IB, Su S, Young IS, Lewis CA, Yamaguchi J, Baran PS. Total synthesis of palau'amine. Angew Chem Int Ed Engl 2010; 49:1095-8. [PMID: 20041464 PMCID: PMC3367661 DOI: 10.1002/anie.200907112] [Citation(s) in RCA: 134] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
| | | | - Ian S. Young
- Department of Chemistry, The Scripps Research Institute, 10650 North Torrey Pines Road, La Jolla, CA, 92037 (USA), Fax: (+1) 858-784-7375
| | - Chad A. Lewis
- Department of Chemistry, The Scripps Research Institute, 10650 North Torrey Pines Road, La Jolla, CA, 92037 (USA), Fax: (+1) 858-784-7375
| | - Junichiro Yamaguchi
- Department of Chemistry, The Scripps Research Institute, 10650 North Torrey Pines Road, La Jolla, CA, 92037 (USA), Fax: (+1) 858-784-7375
| | - Phil S. Baran
- Department of Chemistry, The Scripps Research Institute, 10650 North Torrey Pines Road, La Jolla, CA, 92037 (USA), Fax: (+1) 858-784-7375
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125
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Seiple I, Su S, Young I, Lewis C, Yamaguchi J, Baran P. Total Synthesis of Palau’amine. Angew Chem Int Ed Engl 2009. [DOI: 10.1002/ange.200907112] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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126
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A submarine journey: the pyrrole-imidazole alkaloids. Mar Drugs 2009; 7:705-53. [PMID: 20098608 PMCID: PMC2810223 DOI: 10.3390/md7040705] [Citation(s) in RCA: 168] [Impact Index Per Article: 11.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2009] [Revised: 11/20/2009] [Accepted: 11/26/2009] [Indexed: 12/31/2022] Open
Abstract
In his most celebrated tale "The Picture of Dorian Gray", Oscar Wilde stated that "those who go beneath the surface do so at their peril". This sentence could be a prophetical warning for the practitioner who voluntarily challenges himself with trying to synthesize marine sponge-deriving pyrrole-imidazole alkaloids. This now nearly triple-digit membered community has been growing exponentially in the last 20 years, both in terms of new representatives and topological complexity--from simple, achiral oroidin to the breathtaking 12-ring stylissadines A and B, each possessing 16 stereocenters. While the biosynthesis and the role in the sponge economy of most of these alkaloids still lies in the realm of speculations, significant biological activities for some of them have clearly emerged. This review will account for the progress in achieving the total synthesis of the more biologically enticing members of this class of natural products.
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127
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Trost BM, Dong G. A stereodivergent strategy to both product enantiomers from the same enantiomer of a stereoinducing catalyst: agelastatin A. Chemistry 2009; 15:6910-9. [PMID: 19533707 DOI: 10.1002/chem.200900794] [Citation(s) in RCA: 71] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
In this article, we report a full account of our recent development of pyrroles and N-alkoxyamides as new classes of nucleophiles for palladium-catalyzed AAA reactions, along with application of these methodologies in the total synthesis of agelastatin A, a marine natural product with exceptional anticancer activity and other biological properties. Our method allows for access to either regioisomer of the pyrrolopiperazinones (6 and 19) with high efficiency and enantioselectivity. Note that isomer 19 was obtained via a cascade reaction through a double allylic alkylation pathway. From regioisomer 6, the total synthesis of (+)-agelastatin A was completed in a very short fashion (four steps from 6), during the course of which we developed a new copper catalyst for aziridination and an In(OTf)(3)/DMSO system to oxidatively open an N-tosyl aziridine. Starting with the other pyrrolopiperazinone 19, a five-step sequence has been developed to furnish a formal total synthesis of (-)-agelastatin A. A unique feature of our syntheses is the use of two rather different strategies for the total syntheses of both enantiomers of agelastatin A using the same enantiomer of a chiral palladium catalyst.
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Affiliation(s)
- Barry M Trost
- Department of Chemistry, Stanford University, Stanford, CA 94305-5080, USA.
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128
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Hama N, Matsuda T, Sato T, Chida N. Total synthesis of (-)-agelastatin A: the application of a sequential sigmatropic rearrangement. Org Lett 2009; 11:2687-90. [PMID: 19449885 DOI: 10.1021/ol900799e] [Citation(s) in RCA: 77] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
An enantioselective total synthesis of (-)-agelastatin A from (-)-2,3-O-isopropylidene-d-threitol is described. The sequential Overman/Mislow-Evans rearrangement of the allylic bistrichloroimidate is the key step, which efficiently installed a diaminohydroxy group.
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Affiliation(s)
- Naoto Hama
- Department of Applied Chemistry, Faculty of Science and Technology, Keio University, 3-14-1, Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan
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129
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Wehn PM, Du Bois J. A stereoselective synthesis of the bromopyrrole natural product (-)-agelastatin A. Angew Chem Int Ed Engl 2009; 48:3802-5. [PMID: 19378315 DOI: 10.1002/anie.200806292] [Citation(s) in RCA: 90] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Weaving an intricate web: A stereoselective synthesis of (-)-agelastatin A has been developed, which requires 11 steps from commercially available starting material. The application of a Rh-catalyzed intramolecular olefin aziridination reaction and the subsequent manipulation of the resulting tricyclic intermediate (see scheme) punctuate this study.
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Affiliation(s)
- Paul M Wehn
- Amgen, Inc. 1120 Veterans Blvd., South San Francisco, CA 94080, USA
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130
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Hou GY, Zhou LN, Yin QX, Su WY, Mao HL. Imidazolium 3-nitrobenzoate. Acta Crystallogr Sect E Struct Rep Online 2009; 65:o1038. [PMID: 21583857 PMCID: PMC2977721 DOI: 10.1107/s1600536809013142] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2009] [Accepted: 04/07/2009] [Indexed: 11/23/2022]
Abstract
In the title compound, C3H5N2+·C7H4NO4−, the benzene ring forms a dihedral angle of 40.60 (5)° with the imidizolium ring. The nitrobenzoate anion is approximately planar: the benzene ring makes dihedral angles of 3.8 (3) and 3.2 (1)° with the nitro and carboxylate groups, respectively. In the crystal structure, the cations and anions are linked by intermolecular N—H⋯O hydrogen bonds, forming a zigzag chain along the b axis.
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131
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Wehn P, Du Bois J. A Stereoselective Synthesis of the Bromopyrrole Natural Product (−)-Agelastatin A. Angew Chem Int Ed Engl 2009. [DOI: 10.1002/ange.200806292] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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132
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Giles R, Sullivan J, Steiner A, Looper R. Addition-Hydroamination Reactions of Propargyl Cyanamides: Rapid Access to Highly Substituted 2-Aminoimidazoles. Angew Chem Int Ed Engl 2009. [DOI: 10.1002/ange.200900160] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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133
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Giles R, Sullivan J, Steiner A, Looper R. Addition-Hydroamination Reactions of Propargyl Cyanamides: Rapid Access to Highly Substituted 2-Aminoimidazoles. Angew Chem Int Ed Engl 2009; 48:3116-20. [DOI: 10.1002/anie.200900160] [Citation(s) in RCA: 103] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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134
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Dickson DP, Wardrop DJ. Total synthesis of (+/-)-agelastatin A, a potent inhibitor of osteopontin-mediated neoplastic transformations. Org Lett 2009; 11:1341-4. [PMID: 19228041 DOI: 10.1021/ol900133v] [Citation(s) in RCA: 60] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A stereoselective synthesis of agelastatin A, a potent cytotoxin and inhibitor of osteopontin (OPN)-mediated neoplastic transformations, has been accomplished in 14 steps (12 operations) with an approximate overall yield of 8%. Notable features of this route include the direct manner in which the pyrroloketopiperazine A-ring of the target is generated and the efficient employment of a trichloroacetamide, introduced through Overman rearrangement, as a protecting group, pendant nucleophile, and latent urea.
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Affiliation(s)
- David P Dickson
- Department of Chemistry, University of Illinois at Chicago, 845 West Taylor Street, Chicago, Illinois 60607-7061, USA
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Feldman KS, Fodor MD. Extending Pummerer Reaction Chemistry: (±)-Dibromoagelaspongin Synthesis and Related Studies. J Org Chem 2009; 74:3449-61. [DOI: 10.1021/jo900283g] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- Ken S. Feldman
- Department of Chemistry, The Pennsylvania State University, University Park, Pennsylvania 16802
| | - Matthew D. Fodor
- Department of Chemistry, The Pennsylvania State University, University Park, Pennsylvania 16802
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Abstract
An overview of marine natural products synthesis during 2007 is provided. As with earlier installments in this series, the emphasis is on total syntheses of molecules of contemporary interest, new total syntheses, and syntheses that have resulted in structure confirmation or stereochemical assignments.1 Introduction, 2 Review articles, 3 Azaspiracid, 4 Polyethers, 5 Guanidinium alkaloids, 6 Amphidinolides, 7 Total syntheses of other compounds, 8 Acknowledgements, 9 References.
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Affiliation(s)
- Jonathan C Morris
- School of Chemistry and Physics, University of Adelaide, Adelaide, Australia5005
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Wan Y, Chen XM, Zhang P, Wu H. 1,3-Bis(4-chlorophenyl)-4,5-diethoxyimidazolidine. Acta Crystallogr Sect E Struct Rep Online 2008; 64:o2158. [PMID: 21581018 PMCID: PMC2959530 DOI: 10.1107/s1600536808031176] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2008] [Accepted: 09/26/2008] [Indexed: 11/10/2022]
Abstract
In the molecule of the title compound, C19H22Cl2N2O2, the two benzene rings are oriented at a dihedral angle of 3.70 (3)°. The five-membered ring adopts an envelope conformation.
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138
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Koswatta PB, Sivappa R, Dias HR, Lovely CJ. Total synthesis of (+/-)-calcaridine A and (+/-)-epi-calcaridine A. Org Lett 2008; 10:5055-8. [PMID: 18816134 PMCID: PMC2650485 DOI: 10.1021/ol802018r] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The first total synthesis of the Leucetta alkaloid calcaridine A is described based on a biosynthetic postulate. Application of an oxidative rearrangement of a 4,5-disubstituted imidazole leads to the formation of both calcaridine A and epi-calcaridine A. An X-ray crystal structure determination on the latter has allowed the assignment of the relative configuration of the epimeric natural product and calcaridine A by extrapolation.
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Affiliation(s)
- Panduka B. Koswatta
- Department of Chemistry and Biochemistry, The University of Texas at Arlington, Arlington, TX 76019
| | - Rasapalli Sivappa
- Department of Chemistry and Biochemistry, The University of Texas at Arlington, Arlington, TX 76019
| | - H.V. Rasika Dias
- Department of Chemistry and Biochemistry, The University of Texas at Arlington, Arlington, TX 76019
| | - Carl J. Lovely
- Department of Chemistry and Biochemistry, The University of Texas at Arlington, Arlington, TX 76019
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139
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Feldman KS, Fodor MD. Extending pummerer reaction chemistry. Application to the total synthesis of (+/-)-dibromoagelaspongin. J Am Chem Soc 2008; 130:14964-5. [PMID: 18928282 DOI: 10.1021/ja807020d] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The sponge metabolite dibromoagelaspongin was synthesized in 16 steps from imidazole. The route features two successive oxidative cyclizations with complete control of regiochemistry to deliver the unusual triaminomethane core of the target. These oxidative cyclizations likely resulted from Pummerer-like processes on the imidazole-2-sulfoxide (sulfide) precursors.
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Affiliation(s)
- Ken S Feldman
- Department of Chemistry, The Pennsylvania State University, University Park, Pennsylvania 16802, USA.
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141
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Arndt HD, Riedrich M. Synthesis of Marine Alkaloids from the Oroidin Family. Angew Chem Int Ed Engl 2008; 47:4785-8. [DOI: 10.1002/anie.200801793] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Richards JJ, Ballard TE, Huigens RW, Melander C. Synthesis and Screening of an Oroidin Library againstPseudomonas aeruginosaBiofilms. Chembiochem 2008; 9:1267-79. [DOI: 10.1002/cbic.200700774] [Citation(s) in RCA: 95] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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144
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Hövelmann CH, Streuff J, Brelot L, Muñiz K. Direct synthesis of bicyclic guanidines through unprecedented palladium(ii) catalysed diamination with copper chloride as oxidant. Chem Commun (Camb) 2008:2334-6. [DOI: 10.1039/b719479j] [Citation(s) in RCA: 121] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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145
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Berlinck RGS, Burtoloso ACB, Kossuga MH. The chemistry and biology of organic guanidine derivatives. Nat Prod Rep 2008; 25:919-54. [DOI: 10.1039/b507874c] [Citation(s) in RCA: 151] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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146
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Diederich F, Baumgartner C, Brändli L. Synthesis of 1,2,4-Trisubstituted Imidazoles and 1,3,5-Trisubstituted 1,2,4-Triazoles. HETEROCYCLES 2008. [DOI: 10.3987/com-08-s(n)21] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Abstract
Since its discovery in 1993, the marine natural product palau'amine has intrigued natural product chemists. Its exotic molecular architecture and purported bioactivity made it an ideal target for synthesis. However, as the years went by and related marine alkaloids were isolated, a skeptical eye was cast on the structure of palau'amine; recently these suspicions were confirmed and the structure of palau'amine revised. This Minireview gives a careful overview of the structural revision and its ramifications to both its biogenesis and total synthesis.
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Affiliation(s)
- Matthias Köck
- Alfred-Wegener-Institut für Polar- und Meeresforschung in der Helmholtz-Gemeinschaft, Am Handelshafen 12, 27570 Bremerhaven, Germany.
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