1
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Sutro JL, Fürstner A. Total Synthesis of the Allenic Macrolide (+)-Archangiumide. J Am Chem Soc 2024; 146:2345-2350. [PMID: 38241031 PMCID: PMC10835656 DOI: 10.1021/jacs.3c13304] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2023] [Revised: 01/07/2024] [Accepted: 01/11/2024] [Indexed: 02/01/2024]
Abstract
Archangiumide is the first known macrolide natural product comprising an endocyclic allene. For the ring strain that this linear substructure might entail, it was planned to unveil the allene at a very late stage of the projected total synthesis; in actual fact, this was achieved as the last step of the longest linear sequence by using an otherwise globally deprotected substrate. This unconventional timing was made possible by a gold catalyzed rearrangement of a macrocyclic propargyl benzyl ether derivative that uses a -PMB group as latent hydride source to unveil the signature cycloallene; the protecting group therefore gains a strategic role beyond its mere safeguarding function. Although the gold catalyzed reaction per se is stereoablative, the macrocyclic frame of the target was found to impose high selectivity and a stereoconvergent character on the transformation. The required substrate was formed by ring closing alkyne metathesis (RCAM) with the aid of a new air-stable molybdenum alkylidyne catalyst.
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Affiliation(s)
- Jack L. Sutro
- Max-Planck-Institut für Kohlenforschung, 45470 Mülheim/Ruhr, Germany
| | - Alois Fürstner
- Max-Planck-Institut für Kohlenforschung, 45470 Mülheim/Ruhr, Germany
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2
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Glycosylation of an allenic erythronolide. J Antibiot (Tokyo) 2019; 72:432-436. [PMID: 30816347 DOI: 10.1038/s41429-019-0156-1] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2018] [Revised: 01/14/2019] [Accepted: 01/31/2019] [Indexed: 01/25/2023]
Abstract
A concise route to a glycosylated allenic erythronolide was achieved. Key findings include the preparation of a desosamine sulfoxide donor and the use of the donor to glycosylate bulky acceptors. Additionally, the new reagent was used to prepare allene-containing macrocycles and to realize a four-step synthesis of macrolide 6 from bis[allene] 5. The longest linear sequence required to prepare 6 from commercial reagents was 15 steps.
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3
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Ma S, Liu Q, Tang X, Cai Y. Copper-Catalyzed Synthesis of Tetrasubstituted Allenes from Quaternary Ammonium Salts and Grignard Reagents. ASIAN J ORG CHEM 2017. [DOI: 10.1002/ajoc.201600620] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Affiliation(s)
- Shengming Ma
- State Key Laboratory of Organometallic Chemistry; Shanghai Institute of Organic Chemistry; Chinese Academy of Sciences; 345 Lingling Lu Shanghai 200032 P. R. China
- Department of Chemistry; Fudan University; 220 Handan Road Shanghai 200433 P. R. China
| | - Qi Liu
- State Key Laboratory of Organometallic Chemistry; Shanghai Institute of Organic Chemistry; Chinese Academy of Sciences; 345 Lingling Lu Shanghai 200032 P. R. China
| | - Xinjun Tang
- State Key Laboratory of Organometallic Chemistry; Shanghai Institute of Organic Chemistry; Chinese Academy of Sciences; 345 Lingling Lu Shanghai 200032 P. R. China
| | - Yujuan Cai
- State Key Laboratory of Organometallic Chemistry; Shanghai Institute of Organic Chemistry; Chinese Academy of Sciences; 345 Lingling Lu Shanghai 200032 P. R. China
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4
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Yu L, Wang H, Akhmedov NG, Sowa C, Liu K, Kim H, Williams L. Direct Entry to 4,10-Didesmethyl (9S)-Dihydroerythronolide A via Catalytic Allene Osmylation. Org Lett 2016; 18:2868-71. [DOI: 10.1021/acs.orglett.6b01151] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Libing Yu
- Department
of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, Piscataway, New Jersey 08854, United States
| | - Huan Wang
- Department
of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, Piscataway, New Jersey 08854, United States
| | - Novruz G. Akhmedov
- Department
of Chemistry, West Virginia University, 406 Clark Hall, Prospect Street, Morgantown, West Virginia 26506, United States
| | - Christopher Sowa
- Department
of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, Piscataway, New Jersey 08854, United States
| | - Kai Liu
- Department
of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, Piscataway, New Jersey 08854, United States
| | - Hiyun Kim
- Department
of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, Piscataway, New Jersey 08854, United States
| | - Lawrence Williams
- Department
of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, Piscataway, New Jersey 08854, United States
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5
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Yang Z, Hao WJ, Wang SL, Zhang JP, Jiang B, Li G, Tu SJ. Synthesis of Allenyl Sulfones via a TBHP/TBAI-Mediated Reaction of Propargyl Alcohols with Sulfonyl Hydrazides. J Org Chem 2015; 80:9224-30. [DOI: 10.1021/acs.joc.5b01684] [Citation(s) in RCA: 62] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Affiliation(s)
- Zheng Yang
- School
of Chemistry and Chemical Engineering, Jiangsu Key Laboratory of Green
Synthetic Chemistry for Functional Materials, Jiangsu Normal University, Xuzhou, Jiangsu, 221116, People’s Republic of China
| | - Wen-Juan Hao
- School
of Chemistry and Chemical Engineering, Jiangsu Key Laboratory of Green
Synthetic Chemistry for Functional Materials, Jiangsu Normal University, Xuzhou, Jiangsu, 221116, People’s Republic of China
| | - Shu-Liang Wang
- School
of Chemistry and Chemical Engineering, Jiangsu Key Laboratory of Green
Synthetic Chemistry for Functional Materials, Jiangsu Normal University, Xuzhou, Jiangsu, 221116, People’s Republic of China
| | - Jin-Peng Zhang
- Department
of Public Health, Xuzhou Medical College, Xuzhou, Jiangsu 221000, People’s Republic of China
| | - Bo Jiang
- School
of Chemistry and Chemical Engineering, Jiangsu Key Laboratory of Green
Synthetic Chemistry for Functional Materials, Jiangsu Normal University, Xuzhou, Jiangsu, 221116, People’s Republic of China
| | - Guigen Li
- Institute of Chemistry & BioMedical Sciences, Collaborative Innovation Center of Chemistry for Life Sciences, Nanjing University, Nanjing, Jiangsu, 210093, People’s Republic of China
- Department
of Chemistry and Biochemistry, Texas Tech University, Lubbock, Texas 79409-1061, United States
| | - Shu-Jiang Tu
- School
of Chemistry and Chemical Engineering, Jiangsu Key Laboratory of Green
Synthetic Chemistry for Functional Materials, Jiangsu Normal University, Xuzhou, Jiangsu, 221116, People’s Republic of China
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6
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Tang X, Han Y, Ma S. Cadmium Iodide Mediated Allenylation of Terminal Alkynes for the Synthesis of Methyl-Substituted Allenes. Org Lett 2015; 17:1176-9. [DOI: 10.1021/acs.orglett.5b00105] [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)
- Xinjun Tang
- State
Key Laboratory of Organometallic Chemistry, Shanghai Institute of
Organic Chemistry, Chinese Academy of Sciences, 345 Lingling Lu, Shanghai 200032, P. R. China
| | - Yulin Han
- State
Key Laboratory of Organometallic Chemistry, Shanghai Institute of
Organic Chemistry, Chinese Academy of Sciences, 345 Lingling Lu, Shanghai 200032, P. R. China
| | - Shengming Ma
- State
Key Laboratory of Organometallic Chemistry, Shanghai Institute of
Organic Chemistry, Chinese Academy of Sciences, 345 Lingling Lu, Shanghai 200032, P. R. China
- Department
of Chemistry, Fudan University, 220 Handan Road, Shanghai 200433, P. R. China
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7
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Zhang Y, Pan L, Xu X, Luo H, Liu Q. Tandem Michael addition/imine isomerization/intramolecular [3+2] cycloaddition for the regiospecific synthesis of cyclohepta[b]pyrroles. Chem Commun (Camb) 2014; 50:11039-42. [DOI: 10.1039/c4cc04665j] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
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8
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Adams CS, Grigg RD, Schomaker JM. Complete stereodivergence in the synthesis of 2-amino-1,3-diols from allenes. Chem Sci 2014. [DOI: 10.1039/c4sc01214c] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
Herein, we describe studies to understand how both reagent and substrate control can be effectively employed in the stereodivergent oxidative amination of allenes, with transfer of the axial chirality of an enantioenriched precursor to point chirality in each possible diastereomeric 2-amino-1,3-diol product.
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Affiliation(s)
| | - R. David Grigg
- Department of Chemistry
- University of Wisconsin
- Madison, USA
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9
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Adams CS, Weatherly CD, Burke EG, Schomaker JM. The conversion of allenes to strained three-membered heterocycles. Chem Soc Rev 2014; 43:3136-63. [DOI: 10.1039/c3cs60416k] [Citation(s) in RCA: 87] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
The addition of heteroatoms to an allenic double bond yields strained heterocycles that serve as scaffolds for further useful transformations.
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Affiliation(s)
- C. S. Adams
- Department of Chemistry
- University of Wisconsin
- Madison, USA
| | | | - E. G. Burke
- Department of Chemistry
- University of Wisconsin
- Madison, USA
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10
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Geden JV, Beasley BO, Clarkson GJ, Shipman M. Asymmetric synthesis of 2-substituted oxetan-3-ones via metalated SAMP/RAMP hydrazones. J Org Chem 2013; 78:12243-50. [PMID: 24152298 PMCID: PMC3954718 DOI: 10.1021/jo4020485] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
![]()
2-Substituted oxetan-3-ones can be
prepared in good yields and
enantioselectivities (up to 84% ee) by the metalation of the SAMP/RAMP
hydrazones of oxetan-3-one, followed by reaction with a range of electrophiles
that include alkyl, allyl, and benzyl halides. Additionally, both
chiral 2,2- and 2,4-disubstituted oxetan-3-ones can be made in high
ee (86–90%) by repetition of this lithiation/alkylation sequence
under appropriately controlled conditions. Hydrolysis of the resultant
hydrazones with aqueous oxalic acid provides the 2-substituted oxetan-3-ones
without detectable racemization.
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Affiliation(s)
- Joanna V Geden
- Department of Chemistry, University of Warwick , Gibbet Hill Road, Coventry CV4 7AL, United Kingdom
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11
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Tang X, Zhu C, Cao T, Kuang J, Lin W, Ni S, Zhang J, Ma S. Cadmium iodide-mediated allenylation of terminal alkynes with ketones. Nat Commun 2013; 4:2450. [DOI: 10.1038/ncomms3450] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2013] [Accepted: 08/15/2013] [Indexed: 11/09/2022] Open
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12
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Affiliation(s)
- Rojita Sharma
- Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, Piscataway, New Jersey 08854, United States
| | - Lawrence J. Williams
- Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, Piscataway, New Jersey 08854, United States
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13
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Wagh B, Paul T, Glassford I, DeBrosse C, Klepacki D, Small MC, MacKerell AD, Andrade RB. Desmethyl Macrolides: Synthesis and Evaluation of 4,8-Didesmethyl Telithromycin. ACS Med Chem Lett 2012; 3:1013-1018. [PMID: 24015325 DOI: 10.1021/ml300230h] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
There is an urgent need for novel sources of antibiotics to address the incessant and inevitable onset of bacterial resistance. To this end, we have initiated a structure-based drug design program that features a desmethylation strategy (i.e., replacing methyl groups with hydrogens). Herein we report the total synthesis, molecular modeling and biological evaluation of 4,8-didesmethyl telithromycin (5), a novel desmethyl analogue of the third-generation ketolide antibiotic telithromycin (2), which is an FDA-approved semisynthetic derivative of erythromycin (1). We found 4,8-didesmethyl telithromycin (5) to be eight times more active than previously prepared 4,8,10-tridesmethyl congener (3) and two times more active than 4,10-didesmethyl regioisomer (4) in MIC assays. While less potent than telithromycin (2) and paralleling the observations made in the previous study of 4,10-didesmethyl analogue (4), the inclusion of a single methyl group improves biological activity thus supporting its role in antibiotic activity.
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Affiliation(s)
- Bharat Wagh
- Department of Chemistry, Temple University, Philadelphia, Pennsylvania 19122,
United States
| | - Tapas Paul
- Department of Chemistry, Temple University, Philadelphia, Pennsylvania 19122,
United States
| | - Ian Glassford
- Department of Chemistry, Temple University, Philadelphia, Pennsylvania 19122,
United States
| | - Charles DeBrosse
- Department of Chemistry, Temple University, Philadelphia, Pennsylvania 19122,
United States
| | - Dorota Klepacki
- Center for
Pharmaceutical Biotechnology, University of Illinois, Chicago, Illinois 60607, United
States
| | - Meagan C. Small
- Department of Pharmaceutical
Sciences, University of Maryland, Baltimore,
Maryland 21201,
United States
| | - Alexander D. MacKerell
- Department of Pharmaceutical
Sciences, University of Maryland, Baltimore,
Maryland 21201,
United States
| | - Rodrigo B. Andrade
- Department of Chemistry, Temple University, Philadelphia, Pennsylvania 19122,
United States
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14
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Hopf H, Markopoulos G. The chemistry of bisallenes. Beilstein J Org Chem 2012; 8:1936-98. [PMID: 23209534 PMCID: PMC3511034 DOI: 10.3762/bjoc.8.225] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2012] [Accepted: 10/13/2012] [Indexed: 11/23/2022] Open
Abstract
This review describes the preparation, structural properties and the use of bisallenes in organic synthesis for the first time. All classes of compounds containing at least two allene moieties are considered, starting from simple conjugated bisallenes and ending with allenes in which the two cumulenic units are connected by complex polycyclic ring systems, heteroatoms and/or heteroatom-containing tethers. Preparatively the bisallenes are especially useful in isomerization and cycloaddition reactions of all kinds leading to the respective target molecules with high atom economy and often in high yield. Bisallenes are hence substrates for generating molecular complexity in a small number of steps (high step economy).
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Affiliation(s)
- Henning Hopf
- Institute of Organic Chemistry, Technical University of Braunschweig, Hagenring 30, D-38106 Braunschweig, Germany, fax: +49-(0)531-391-5388
| | - Georgios Markopoulos
- Institute of Organic Chemistry, Technical University of Braunschweig, Hagenring 30, D-38106 Braunschweig, Germany, fax: +49-(0)531-391-5388
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15
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Adams CS, Boralsky LA, Guzei IA, Schomaker JM. Modular functionalization of allenes to aminated stereotriads. J Am Chem Soc 2012; 134:10807-10. [PMID: 22708990 PMCID: PMC4476975 DOI: 10.1021/ja304859w] [Citation(s) in RCA: 75] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Nitrogen-containing stereotriads, compounds with three adjacent stereodefined carbons, are commonly found in biologically important molecules. However, the preparation of molecules bearing these motifs can be challenging. Herein, we describe a modular oxidation protocol which converts a substituted allene to a triply functionalized amine of the form C-X/C-N/C-Y. The key step employs a Rh-catalyzed intramolecular conversion of the allene to a strained bicyclic methylene aziridine. This reactive intermediate is further elaborated to the target products, often in one reaction vessel and with effective transfer of the axial chirality of the allene to point chirality in the stereotriad.
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Affiliation(s)
| | - Luke A. Boralsky
- Department of Chemistry, University of Wisconsin, Madison, Wisconsin, 53706
| | - Ilia A. Guzei
- Department of Chemistry, University of Wisconsin, Madison, Wisconsin, 53706
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16
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Velvadapu V, Glassford I, Lee M, Paul T, DeBrosse C, Klepacki D, Small MC, MacKerell AD, Andrade RB. Desmethyl Macrolides: Synthesis and Evaluation of 4,10-Didesmethyl Telithromycin. ACS Med Chem Lett 2012; 3:211-215. [PMID: 22708010 DOI: 10.1021/ml200254h] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
Novel sources of antibiotics are required to keep pace with the inevitable onset of bacterial resistance. Continuing with our macrolide desmethylation strategy as a source of new antibiotics, we report the total synthesis, molecular modeling and biological evaluation of 4,10-didesmethyl telithromycin (4), a novel desmethyl analogue of the 3rd-generation drug telithromycin (2). Telithromycin is an FDA-approved ketolide antibiotic derived from erythromycin (1). We found 4,10-didesmethyl telithromycin (4) to be four times more active than previously prepared 4,8,10-tridesmethyl congener (3) in MIC assays. While less potent than telithromycin (2), the inclusion of the C-8 methyl group has improved biological activity suggesting it plays an important role in antibiotic function.
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Affiliation(s)
- Venkata Velvadapu
- Department of Chemistry, Temple University, Philadelphia, Pennsylvania 19122,
United States
| | - Ian Glassford
- Department of Chemistry, Temple University, Philadelphia, Pennsylvania 19122,
United States
| | - Miseon Lee
- Department of Chemistry, Temple University, Philadelphia, Pennsylvania 19122,
United States
| | - Tapas Paul
- Department of Chemistry, Temple University, Philadelphia, Pennsylvania 19122,
United States
| | - Charles DeBrosse
- Department of Chemistry, Temple University, Philadelphia, Pennsylvania 19122,
United States
| | - Dorota Klepacki
- Center for
Pharmaceutical Biotechnology, University of Illinois, Chicago, Illinois 60607, United
States
| | - Meagan C. Small
- Department of Pharmaceutical
Sciences, University of Maryland, Baltimore,
Maryland 21201,
United States
| | - Alexander D. MacKerell
- Department of Pharmaceutical
Sciences, University of Maryland, Baltimore,
Maryland 21201,
United States
| | - Rodrigo B. Andrade
- Department of Chemistry, Temple University, Philadelphia, Pennsylvania 19122,
United States
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17
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Malona JA, Cariou K, Spencer WT, Frontier AJ. Total synthesis of (±)-rocaglamide via oxidation-initiated Nazarov cyclization. J Org Chem 2012; 77:1891-908. [PMID: 22283818 DOI: 10.1021/jo202366c] [Citation(s) in RCA: 55] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
This article describes the evolution of a Nazarov cyclization-based synthetic strategy targeting the anticancer, antiinflammatory, and insecticidal natural product (±)-rocaglamide. Initial pursuit of a polarized heteroaromatic Nazarov cyclization to construct the congested cyclopentane core revealed an unanticipated electronic bias in the pentadienyl cation. This reactivity was harnessed in a successful second-generation approach using an oxidation-initiated Nazarov cyclization of a heteroaryl alkoxyallene. Full details of these two approaches are given, as well as the characterization of undesired reaction pathways available to the Nazarov cyclization product. A sequence of experiments that led to an understanding of the unexpected reactivity of this key intermediate is described, which culminated in the successful total synthesis of (+)-rocaglamide.
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Affiliation(s)
- John A Malona
- Department of Chemistry, University of Rochester, Rochester, New York 14627, USA
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18
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Allenes in Catalytic Asymmetric Synthesis and Natural Product Syntheses. Angew Chem Int Ed Engl 2012; 51:3074-112. [DOI: 10.1002/anie.201101460] [Citation(s) in RCA: 758] [Impact Index Per Article: 63.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2011] [Indexed: 02/06/2023]
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19
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Yu S, Ma S. Allene in katalytischer asymmetrischer Synthese und Naturstoffsynthese. Angew Chem Int Ed Engl 2012. [DOI: 10.1002/ange.201101460] [Citation(s) in RCA: 254] [Impact Index Per Article: 21.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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20
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Liu K, Kim H, Ghosh P, Akhmedov NG, Williams LJ. Direct entry to erythronolides via a cyclic bis[allene]. J Am Chem Soc 2011; 133:14968-71. [PMID: 21894913 PMCID: PMC3235949 DOI: 10.1021/ja207496p] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The complexity and low tractability of antibiotic macrolides pose serious challenges to addressing the problem of resistance through semi- or total synthesis. Here we describe a new strategy involving the preparation of a complex yet tractable macrocycle and the transformation of this macrocycle into a range of erythronolide congeners. These compounds represent valuable sectors of erythromycinoid structure space and constitute intermediates with the potential to provide further purchase in this space. The routes are short. The erythronolides were prepared in three or fewer steps from the macrocycle, which was prepared in a longest linear sequence of 11 steps.
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Affiliation(s)
- Kai Liu
- Department of Chemistry, Rutgers, The State University of New Jersey, 610 Taylor Rd, Piscataway, NJ 08854
| | - Hiyun Kim
- Department of Chemistry, Rutgers, The State University of New Jersey, 610 Taylor Rd, Piscataway, NJ 08854
| | - Partha Ghosh
- Department of Chemistry, Rutgers, The State University of New Jersey, 610 Taylor Rd, Piscataway, NJ 08854
| | - Novruz G. Akhmedov
- Department of Chemistry, West Virginia University, 406 Clark Hall, Prospect Street, Morgantown, WV 26506
| | - Lawrence J. Williams
- Department of Chemistry, Rutgers, The State University of New Jersey, 610 Taylor Rd, Piscataway, NJ 08854
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21
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Xu D, Drahl MA, Williams LJ. Toward an integrated route to the vernonia allenes and related sesquiterpenoids. Beilstein J Org Chem 2011; 7:937-43. [PMID: 21804888 PMCID: PMC3135329 DOI: 10.3762/bjoc.7.104] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2011] [Accepted: 06/09/2011] [Indexed: 11/23/2022] Open
Abstract
The synthesis of a model endocyclic allene related to the vernonia allenes is described. Fragmentation of a suitable decalin derivative gave the simplified germacrane scaffold. Computational analysis of this and related substrates provides insight into the stereoelectronic requirements of C-C fragmentation. The overall strategy to access these and other sesquiterpenes and the key steps in the present sequence are also discussed.
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Affiliation(s)
- Da Xu
- Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, 610 Taylor Road, Piscataway, NJ 08854, USA
| | - Michael A Drahl
- Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, 610 Taylor Road, Piscataway, NJ 08854, USA
| | - Lawrence J Williams
- Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, 610 Taylor Road, Piscataway, NJ 08854, USA
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22
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Sharma R, Manpadi M, Zhang Y, Kim H, Ahkmedov NG, Williams LJ. Spirodiepoxide-based cascades: direct access to diverse motifs. Org Lett 2011; 13:3352-5. [PMID: 21648404 DOI: 10.1021/ol201101e] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Allene epoxide formation/opening reaction sequences enabled direct access to diverse products. Described here are a single flask procedure for allene preparation and allene oxidation/derivatization reactions that give, among others, diendiol, diyndiol, α'-hydroxy-γ-enone, dihydrofuranone, butenolide, and δ-lactone products.
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Affiliation(s)
- Rojita Sharma
- Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, Piscataway, New Jersey 08854, USA
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23
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Cordier P, Aubert C, Malacria M, Gandon V, Lacôte E. Oxidation of alpha-alkoxy allenes into alpha'-alkoxy enones. Chemistry 2011; 16:9973-6. [PMID: 20645348 DOI: 10.1002/chem.201000914] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Pierre Cordier
- UPMC Univ Paris 06, IPCM UMR CNRS 7201, 4 place Jussieu, 75005 Paris, France
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24
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Joyasawal S, Lotesta SD, Akhmedov NG, Williams LJ. Spirodiepoxide strategy to the C ring of pectenotoxin 4: synthesis of the C1-C19 sector. Org Lett 2010; 12:988-91. [PMID: 20121257 DOI: 10.1021/ol902984e] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The synthesis of a C1-C19 precursor to pectenotoxin 4 is presented. The strategy employed the functionalized allene shown. Key features include: olefin metathesis of two simple fragments to prepare the left portion of the allene-precursor, diastereoselective propargylation of an epoxy aldehyde to form the right portion, use of the DMDO-stable m-fluorobenzyl ether, and an allene spirodiepoxidation/C-ring formation cascade.
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Affiliation(s)
- Sipak Joyasawal
- Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, Piscataway, New Jersey 08854, USA
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Zhang Y, Cusick JR, Ghosh P, Shangguan N, Katukojvala S, Inghrim J, Emge TJ, Williams LJ. Spirodiepoxides: synthesis of epoxomicinoids. J Org Chem 2009; 74:7707-14. [PMID: 19761213 DOI: 10.1021/jo901320f] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Three closely related analogues of epoxomicin have been synthesized. Allene-derived spirodiepoxides were key intermediates. Spirodiepoxide formation and stereochemical dependence on solvent, oxidant, and allene structure were cataloged. The facial selectivity of the first epoxidation of 1,3-disubstituted and trisubstituted allenes was found to be >20:1 with dimethyldioxirane in chloroform. For stereogenic allenes, the facial selectivity of the second oxidation is dependent primarily on allene structure and secondarily on solvent and oxidant. For the acyclic systems evaluated this ratio was as high as 8:1. A conformational model is advanced to account for these observations.
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Affiliation(s)
- Yue Zhang
- Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, New Brunswick, New Jersey 08903, USA
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