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Zhang X, Sivaguru P, Zanoni G, Han X, Tong M, Bi X. Catalytic Asymmetric C(sp 3)–H Carbene Insertion Approach to Access Enantioenriched 3-Fluoroalkyl 2,3-Dihydrobenzofurans. ACS Catal 2021. [DOI: 10.1021/acscatal.1c04523] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Xinyu Zhang
- Department of Chemistry, Northeast Normal University, Changchun 130024, China
| | | | - Giuseppe Zanoni
- Department of Chemistry, University of Pavia, Viale Taramelli 12, 27100 Pavia, Italy
| | - Xinyue Han
- Department of Chemistry, Northeast Normal University, Changchun 130024, China
| | - Minghui Tong
- Department of Chemistry, Northeast Normal University, Changchun 130024, China
| | - Xihe Bi
- Department of Chemistry, Northeast Normal University, Changchun 130024, China
- State Key Laboratory of Elemento-Organic Chemistry, Nankai University, Tianjin 300071, China
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Maji A, Reddi Y, Sunoj RB, Maiti D. Mechanistic Insights on Orthogonal Selectivity in Heterocycle Synthesis. ACS Catal 2018. [DOI: 10.1021/acscatal.8b02537] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Arun Maji
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
- Department of Chemistry, University of Illinois at Urbana−Champaign, Illinois 61801, United States
| | - Yernaidu Reddi
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
| | - Raghavan B. Sunoj
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
| | - Debabrata Maiti
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
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David N, Pasceri R, Kitson RRA, Pradal A, Moody CJ. Formal Total Synthesis of Diazonamide A by Indole Oxidative Rearrangement. Chemistry 2016; 22:10867-76. [DOI: 10.1002/chem.201601605] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2016] [Indexed: 11/09/2022]
Affiliation(s)
- Nadège David
- School of Chemistry; University of Nottingham, University Park; Nottingham NG7 2RD UK
| | - Raffaele Pasceri
- School of Chemistry; University of Nottingham, University Park; Nottingham NG7 2RD UK
| | - Russell R. A. Kitson
- School of Chemistry; University of Nottingham, University Park; Nottingham NG7 2RD UK
| | - Alexandre Pradal
- School of Chemistry; University of Nottingham, University Park; Nottingham NG7 2RD UK
| | - Christopher J. Moody
- School of Chemistry; University of Nottingham, University Park; Nottingham NG7 2RD UK
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Mutule I, Joo B, Medne Z, Kalnins T, Vedejs E, Suna E. Stereoselective Synthesis of the Diazonamide A Macrocyclic Core. J Org Chem 2015; 80:3058-66. [DOI: 10.1021/jo5029419] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Ilga Mutule
- Latvian Institute of Organic Synthesis, Aizkraukles 21, LV-1006, Riga, Latvia
| | - Beomjun Joo
- Department
of Chemistry, University of Michigan, Ann Arbor, Michigan 48109, United States
| | - Zane Medne
- Latvian Institute of Organic Synthesis, Aizkraukles 21, LV-1006, Riga, Latvia
| | - Toms Kalnins
- Latvian Institute of Organic Synthesis, Aizkraukles 21, LV-1006, Riga, Latvia
| | - Edwin Vedejs
- Department
of Chemistry, University of Michigan, Ann Arbor, Michigan 48109, United States
| | - Edgars Suna
- Latvian Institute of Organic Synthesis, Aizkraukles 21, LV-1006, Riga, Latvia
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Xia L, Lee YR. A novel and efficient synthesis of diverse dihydronaphtho[1,2-b]furans using the ceric ammonium nitrate-catalyzed formal [3 + 2] cycloaddition of 1,4-naphthoquinones to olefins and its application to furomollugin. Org Biomol Chem 2013; 11:6097-107. [DOI: 10.1039/c3ob40977e] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
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Nicolaou KC, Hale CRH, Nilewski C, Ioannidou HA. Constructing molecular complexity and diversity: total synthesis of natural products of biological and medicinal importance. Chem Soc Rev 2012; 41:5185-238. [PMID: 22743704 PMCID: PMC3426871 DOI: 10.1039/c2cs35116a] [Citation(s) in RCA: 159] [Impact Index Per Article: 13.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
The advent of organic synthesis and the understanding of the molecule as they occurred in the nineteenth century and were refined in the twentieth century constitute two of the most profound scientific developments of all time. These discoveries set in motion a revolution that shaped the landscape of the molecular sciences and changed the world. Organic synthesis played a major role in this revolution through its ability to construct the molecules of the living world and others like them whose primary element is carbon. Although the early beginnings of organic synthesis came about serendipitously, organic chemists quickly recognized its potential and moved decisively to advance and exploit it in myriad ways for the benefit of mankind. Indeed, from the early days of the synthesis of urea and the construction of the first carbon-carbon bond, the art of organic synthesis improved to impressively high levels of sophistication. Through its practice, today chemists can synthesize organic molecules--natural and designed--of all types of structural motifs and for all intents and purposes. The endeavor of constructing natural products--the organic molecules of nature--is justly called both a creative art and an exact science. Often called simply total synthesis, the replication of nature's molecules in the laboratory reflects and symbolizes the state of the art of synthesis in general. In the last few decades a surge in total synthesis endeavors around the world led to a remarkable collection of achievements that covers a wide ranging landscape of molecular complexity and diversity. In this article, we present highlights of some of our contributions in the field of total synthesis of natural products of biological and medicinal importance. For perspective, we also provide a listing of selected examples of additional natural products synthesized in other laboratories around the world over the last few years.
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Affiliation(s)
- K C Nicolaou
- Department of Chemistry and Skaggs Institute for Chemical Biology, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, California 92037, USA
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Zhang J, Ciufolini MA. An Approach to the Bis-oxazole Macrocycle of Diazonamides. Org Lett 2010; 13:390-3. [DOI: 10.1021/ol102678j] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Jianmin Zhang
- Department of Chemistry, University of British Columbia, 2036 Main Mall, Vancouver, BC V6T 1Z1, Canada
| | - Marco A. Ciufolini
- Department of Chemistry, University of British Columbia, 2036 Main Mall, Vancouver, BC V6T 1Z1, Canada
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8
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Bonnamour J, Piedrafita M, Bolm C. Iron and Copper Salts in the Synthesis of Benzo[b]furans. Adv Synth Catal 2010. [DOI: 10.1002/adsc.201000269] [Citation(s) in RCA: 52] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Lachia M, Moody CJ. The synthetic challenge of diazonamide A, a macrocyclic indole bis-oxazole marine natural product. Nat Prod Rep 2008; 25:227-53. [DOI: 10.1039/b705663j] [Citation(s) in RCA: 101] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Abstract
Total synthesis campaigns toward complex heterocyclic natural products are a prime source of inspiration for the design and execution of complex cascade sequences, powerful reactions, and efficient synthetic strategies. We highlight selected examples of such innovations in the course of our total syntheses of diazonamide A, azaspiracid-1, thiostrepton, 2,2'-epi-cytoskyrin A and rugulosin, abyssomycin C, platensimycin, and uncialamycin.
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Affiliation(s)
- K. C. Nicolaou
- 1Department of Chemistry and The Skaggs Institute for Chemical Biology, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA 92037, USA and the Department of Chemistry and Biochemistry, University of California, San Diego, 9500 Gilman Drive, La Jolla, CA 92093, USA
| | - Jason S. Chen
- 1Department of Chemistry and The Skaggs Institute for Chemical Biology, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA 92037, USA and the Department of Chemistry and Biochemistry, University of California, San Diego, 9500 Gilman Drive, La Jolla, CA 92093, USA
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Cheung CM, Goldberg FW, Magnus P, Russell CJ, Turnbull R, Lynch V. An expedient formal total synthesis of (-)-diazonamide A via a powerful, stereoselective O-aryl to C-aryl migration to form the C10 quaternary center. J Am Chem Soc 2007; 129:12320-7. [PMID: 17880079 PMCID: PMC2536501 DOI: 10.1021/ja0744448] [Citation(s) in RCA: 72] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
During the course of studies on the synthesis of diazonamide A 1, an unusual O-aryl into C-aryl rearrangement was discovered that allows partial control of the absolute stereochemistry of the C-10 quaternary stereogenic center. Treatment of 30 with TBAF/THF gave the O-tyrosine ethers 31 and 32 (1:1), which on heating each separately in chloroform at reflux rearranged to 33 and 34 in ratios of 84:16 and 56:44, respectively. This corresponds to a 70% yield of the correct C-10 stereoisomer 33 and a 30% yield of the wrong C-10 stereoisomer 34. Attempts to convert 34 into 33 by ipso-protonation and equilibration were unsuccessful. Confirmation of the stereochemical outcome of the rearrangement was obtained by converting 33 into 37, an advanced intermediate in the first synthesis of diazonamide A by Nicolaou et al. It was also found that the success of the above rearrangement is sensitive to the protecting group on both the tryptophan nitrogen atom and the tyrosine nitrogen atom.
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Affiliation(s)
- Chi-Ming Cheung
- Department of Chemistry and Biochemistry, University of Texas at Austin, 1 University Station A5300, Austin, Texas 78712-1167, USA
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Poriel C, Lachia M, Wilson C, Davies JR, Moody CJ. Oxidative rearrangement of indoles: a new approach to the EFHG-tetracyclic core of diazonamide A. J Org Chem 2007; 72:2978-87. [PMID: 17367196 DOI: 10.1021/jo062627r] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A new approach to the ring EFHG-tetracyclic core fragment of the marine secondary metabolite diazonamide A is described. The route is based on the oxidative rearrangement of 3-arylindole-2-carboxylates. Thus, a range of 3-arylindole-2-carboxylates (3, 8) underwent rearrangement to the corresponding 3,3-disubstituted oxindoles (4, 9) with migration of the ester group upon treatment with tert-butyl hypochlorite followed by acid. The oxindoles 9 with a 3-[2-(4-methoxybenzyloxy)]phenyl substituent underwent cyclization to the tetracyclic aminals 11 following N-protection, reduction, and treatment with methanesulfonic anhydride. The methodology was applied to the tyrosine-indole derivative 17 to give the EFHG-tetracyclic core of diazonamide A.
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Affiliation(s)
- Cyril Poriel
- Department of Chemistry, University of Exeter, Stocker Road, Exeter EX4 4QD, United Kingdom
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Nicolaou KC, Snyder SA. Chasing molecules that were never there: misassigned natural products and the role of chemical synthesis in modern structure elucidation. Angew Chem Int Ed Engl 2007; 44:1012-1044. [PMID: 15688428 DOI: 10.1002/anie.200460864] [Citation(s) in RCA: 472] [Impact Index Per Article: 27.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Over the course of the past half century, the structural elucidation of unknown natural products has undergone a tremendous revolution. Before World War II, a chemist would have relied almost exclusively on the art of chemical synthesis, primarily in the form of degradation and derivatization reactions, to develop and test structural hypotheses in a process that often took years to complete when grams of material were available. Today, a battery of advanced spectroscopic methods, such as multidimensional NMR spectroscopy and high-resolution mass spectrometry, not to mention X-ray crystallography, exist for the expeditious assignment of structures to highly complex molecules isolated from nature in milligram or sub-milligram quantities. In fact, it could be argued that the characterization of natural products has become a routine task, one which no longer even requires a reaction flask! This Review makes the case that imaginative detective work and chemical synthesis still have important roles to play in the process of solving nature's most intriguing molecular puzzles.
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Affiliation(s)
- K C Nicolaou
- Department of Chemistry and The Skaggs Institute for Chemical Biology, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA 92037, USA, Fax: (+1) 858-784-2469
- Department of Chemistry and Biochemistry, University of California, San Diego, 9500 Gilman Drive, La Jolla, CA 92093, USA
| | - Scott A Snyder
- Department of Chemistry and The Skaggs Institute for Chemical Biology, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA 92037, USA, Fax: (+1) 858-784-2469
- Department of Chemistry and Biochemistry, University of California, San Diego, 9500 Gilman Drive, La Jolla, CA 92093, USA
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Nicolaou KC, Snyder SA. Die Jagd auf Moleküle, die nie existiert haben: Falsch zugeordnete Naturstoffstrukturen und die Rolle der chemischen Synthese in der modernen Strukturaufklärung. Angew Chem Int Ed Engl 2005. [DOI: 10.1002/ange.200460864] [Citation(s) in RCA: 130] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- K. C. Nicolaou
- Department of Chemistry und The Skaggs Institute for Chemical Biology, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA 92037, USA, Fax: (+1) 858‐784‐2469
- Department of Chemistry and Biochemistry, University of California San Diego, 9500 Gilman Drive, La Jolla, CA 92093, USA
| | - Scott A. Snyder
- Department of Chemistry und The Skaggs Institute for Chemical Biology, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA 92037, USA, Fax: (+1) 858‐784‐2469
- Department of Chemistry and Biochemistry, University of California San Diego, 9500 Gilman Drive, La Jolla, CA 92093, USA
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Palmer FN, Lach F, Poriel C, Pepper AG, Bagley MC, Slawin AMZ, Moody CJ. The diazo route to diazonamide A: studies on the tyrosine-derived fragment. Org Biomol Chem 2005; 3:3805-11. [PMID: 16211117 DOI: 10.1039/b510653b] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Various approaches to the tyrosine-derived fragment of the marine secondary metabolite diazonamide A are described. Initial efforts were focused on the originally proposed structure of the natural product, and a feasibility study established that a model 4-aryltryptamine could be readily prepared. Protected 4-bromotryptamine underwent Pd0-catalyzed coupling with the boronic acid derived from 2-bromophenyl allyl ether by Claisen rearrangement, O-methylation and lithiation-boration. The resulting biaryl was elaborated into an alpha-diazo-beta-ketoester, dirhodium(II)-catalyzed reaction of which with N-Z-valinamide gave the desired tryptamine-oxazole following cyclodehydration of the intermediate ketoamide. A potential precursor to the benzofuran ring of the original structure of diazonamide A was prepared in eight steps from N-Z-tyrosine tert-butyl ester. Iodination, O-protection and Stille coupling gave the cinnamyl alcohol 25, converted via the bromide into the allyl aryl ether 27. Subsequent Claisen rearrangement and oxidative cleavage of the alkene gave the lactol 29, converted into the desired benzofuranone 31. The revision in the structure of diazonamide A to 2 resulted in the targeting of an alternative tyrosine-derived model benzofuranone 41 synthesized in four steps from N-Z-tyrosine methyl ester 36 by a route involving Claisen rearrangement of cinnamyl ether 37. Poor yields in this sequence prompted an investigation into the intramolecular Heck reaction as a route to benzofuranone 50. Coupling of 3-iodotyrosine 44 with 2-phenylbutenoic acid 48 gave ester 49 that readily underwent intramolecular Heck reaction to give benzofuranone 50, albeit with poor stereocontrol.
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Affiliation(s)
- Francine N Palmer
- Department of Chemistry, University of Exeter, Stocker Road, Exeter, UKEX4 4QD
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17
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18
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Nicolaou KC, Snyder SA. The essence of total synthesis. Proc Natl Acad Sci U S A 2004; 101:11929-36. [PMID: 15302925 PMCID: PMC514411 DOI: 10.1073/pnas.0403799101] [Citation(s) in RCA: 82] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2004] [Accepted: 07/01/2004] [Indexed: 11/18/2022] Open
Abstract
For the past century, the total synthesis of natural products has served as the flagship of chemical synthesis and the principal driving force for discovering new chemical reactivity, evaluating physical organic theories, testing the power of existing synthetic methods, and enabling biology and medicine. This perspective article seeks to examine this time-honored and highly demanding art, distilling its essence in an effort to ascertain its power and future potential.
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Affiliation(s)
- K C Nicolaou
- Department of Chemistry, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA 92037, USA.
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19
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20
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Zajac MA, Vedejs E. A Synthesis of the Diazonamide Heteroaromatic Biaryl Macrocycle/Hemiaminal Core. Org Lett 2003; 6:237-40. [PMID: 14723537 DOI: 10.1021/ol036179a] [Citation(s) in RCA: 39] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
[reaction: see text] Stille coupling of an arylstannane aminal 19 with the palladium complex 23 leads to atropisomeric esters 28 and 29. Conversion to macrocycle 30 is demonstrated, a potential precursor of natural and unnatural diazonamides.
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Affiliation(s)
- Matthew A Zajac
- Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48109, USA
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21
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22
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Sawada T, Fuerst DE, Wood JL. Rhodium-catalyzed synthesis of a C(3) disubstituted oxindole: an approach to diazonamide A. Tetrahedron Lett 2003. [DOI: 10.1016/s0040-4039(03)01038-4] [Citation(s) in RCA: 39] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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23
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Nicolaou KC, Huang X, Snyder SA, Bheema Rao P, Bella M, Reddy MV. A Novel Regio- and Stereoselective Synthesis of Sulfamidates from 1,2-Diols Using Burgess and Related Reagents: A Facile Entry intoβ-Amino Alcohols. Angew Chem Int Ed Engl 2002. [DOI: 10.1002/1521-3757(20020301)114:5<862::aid-ange862>3.0.co;2-7] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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24
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Li J, Jeong S, Esser L, Harran PG. Total Synthesis of Nominal Diazonamides—Part 1: Convergent Preparation of the Structure Proposed for (−)-Diazonamide A. Angew Chem Int Ed Engl 2001. [DOI: 10.1002/1521-3757(20011217)113:24<4901::aid-ange4901>3.0.co;2-0] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Li J, Jeong S, Esser L, Harran PG. Total Synthesis of Nominal Diazonamides-Part 1: Convergent Preparation of the Structure Proposed for (-)-Diazonamide A Funding provided by the NIH (RO1-GM60591), the NSF (CAREER 9984282), the Howard Hughes Medical Institute (junior faculty support), the Robert A. Welch Foundation, and the Advanced Research Program of the Texas Higher Education Coordinating Board. Angew Chem Int Ed Engl 2001; 40:4765-4769. [PMID: 12404411 DOI: 10.1002/1521-3773(20011217)40:24<4765::aid-anie4765>3.0.co;2-1] [Citation(s) in RCA: 132] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Jing Li
- Department of Biochemistry University of Texas, Southwestern Medical Center at Dallas Dallas, TX 75390-9038 (USA)
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Nicolaou KC, Huang X, Giuseppone N, Bheema Rao P, Bella M, Reddy MV, Snyder SA. Construction of the Complete Aromatic Core of Diazonamide A by a Novel Hetero Pinacol Macrocyclization Cascade Reaction We thank Drs. D. H. Huang and G. Suizdak for NMR spectroscopic and mass spectrometric assistance, respectively. Financial support for this work was provided by The Skaggs Institute for Chemical Biology, the National Institutes of Health (USA), American Biosciences, a predoctoral fellowship from the National Science Foundation (S.A.S.), a postdoctoral fellowship from the Association pour la Recherche sur le Cancer (N.G.), and grants from Abbott, Amgen, Array Biopharma, Boehringer-Ingelheim, Glaxo, Hoffmann-LaRoche, DuPont, Merck, Novartis, Pfizer, and Schering Plough. Angew Chem Int Ed Engl 2001; 40:4705-4709. [PMID: 12404390 DOI: 10.1002/1521-3773(20011217)40:24<4705::aid-anie4705>3.0.co;2-d] [Citation(s) in RCA: 67] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- K. C. Nicolaou
- 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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27
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Nicolaou KC, Huang X, Giuseppone N, Bheema Rao P, Bella M, Reddy MV, Snyder SA. Construction of the Complete Aromatic Core of Diazonamide A by a Novel Hetero Pinacol Macrocyclization Cascade Reaction. Angew Chem Int Ed Engl 2001. [DOI: 10.1002/1521-3757(20011217)113:24<4841::aid-ange4841>3.0.co;2-z] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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28
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29
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Vedejs E, Zajac MA. Synthesis of the diazonamide A macrocyclic core via a Dieckmann-type cyclization. Org Lett 2001; 3:2451-4. [PMID: 11483032 DOI: 10.1021/ol016097r] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
[reaction: see text] Suzuki coupling of 18 and 30 affords 9 as an interconverting mixture of two atropisomers. Treatment with LDA at -23 degrees C affords the macrocyclic ketone 8 in 57% yield.
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Affiliation(s)
- E Vedejs
- Department of Chemistry, University of Michigan, Ann Arbor, MI 48109, USA.
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30
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31
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32
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Direct conversion of α,β-unsaturated nitriles into cyanohydrins using Mn(dpm)3 catalyst, dioxygen and phenylsilane. Tetrahedron Lett 2001. [DOI: 10.1016/s0040-4039(01)00693-1] [Citation(s) in RCA: 75] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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33
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Five Membered Ring Systems: Pyrroles and Benzo Derivatives. ACTA ACUST UNITED AC 2001. [DOI: 10.1016/s0959-6380(01)80008-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register]
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