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Wahart AC, Beardmore LND, Field RA, Cosgrove SC, Miller GJ. Tandem One-Pot Biocatalytic Oxidation and Wittig Reaction in Water. Org Lett 2024; 26:6642-6646. [PMID: 39075662 PMCID: PMC11320638 DOI: 10.1021/acs.orglett.4c02201] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2024] [Revised: 07/18/2024] [Accepted: 07/23/2024] [Indexed: 07/31/2024]
Abstract
We explore biocatalytic aldehyde generation under aqueous conditions, concomitantly delivering access to a one-pot Wittig reaction using stabilized phosphoranes and granting diverse alkene products. Using a recombinant choline oxidase mutant, we first undertake biocatalytic alcohol oxidation across a range of functional aliphatic primary alcohols, demonstrating a remarkable substrate tolerance for this enzyme, including chloride, bromide, azide, S-methyl, and alkynyl groups. Following this, we extend capability and deliver a practicable milligram-scale one-pot Wittig reaction in water.
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Affiliation(s)
- Alice
J. C. Wahart
- School
of Chemical and Physical Sciences and Centre for Glycoscience, Keele University, Keele, Staffordshire ST5 5BG, U.K.
| | - Liam N. D. Beardmore
- School
of Chemical and Physical Sciences and Centre for Glycoscience, Keele University, Keele, Staffordshire ST5 5BG, U.K.
| | - Robert A. Field
- Department
of Chemistry and Manchester Institute of Biotechnology, The University of Manchester, 131 Princess Street, Manchester M1 7DN, U.K.
| | - Sebastian C. Cosgrove
- School
of Chemical and Physical Sciences and Centre for Glycoscience, Keele University, Keele, Staffordshire ST5 5BG, U.K.
| | - Gavin J. Miller
- School
of Chemical and Physical Sciences and Centre for Glycoscience, Keele University, Keele, Staffordshire ST5 5BG, U.K.
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2
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Synthesis of the phorboxazoles—potent, architecturally novel marine natural products. J Antibiot (Tokyo) 2016; 69:220-52. [DOI: 10.1038/ja.2016.8] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2015] [Revised: 01/14/2016] [Accepted: 01/19/2016] [Indexed: 11/08/2022]
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Gulevich AV, Dudnik AS, Chernyak N, Gevorgyan V. Transition metal-mediated synthesis of monocyclic aromatic heterocycles. Chem Rev 2013; 113:3084-213. [PMID: 23305185 PMCID: PMC3650130 DOI: 10.1021/cr300333u] [Citation(s) in RCA: 814] [Impact Index Per Article: 74.0] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Anton V. Gulevich
- Department of Chemistry, University of Illinois at Chicago, 845 West Taylor Street, 4500 SES, M/C 111, Chicago, Illinois 60607-7061
| | - Alexander S. Dudnik
- Department of Chemistry, University of Illinois at Chicago, 845 West Taylor Street, 4500 SES, M/C 111, Chicago, Illinois 60607-7061
| | - Natalia Chernyak
- Department of Chemistry, University of Illinois at Chicago, 845 West Taylor Street, 4500 SES, M/C 111, Chicago, Illinois 60607-7061
| | - Vladimir Gevorgyan
- Department of Chemistry, University of Illinois at Chicago, 845 West Taylor Street, 4500 SES, M/C 111, Chicago, Illinois 60607-7061
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Mohapatra S, Bhanja C, Jena S, Chakroborty S, Nayak S. Advances in the Bestmann–Ohira Reagent–Assisted Regioselective Synthesis of Substituted Pyrazoles, Triazoles, and Oxazoles. SYNTHETIC COMMUN 2013. [DOI: 10.1080/00397911.2012.711883] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Affiliation(s)
- Seetaram Mohapatra
- a Department of Chemistry , Ravenshaw University , Cuttack , Odisha , India
| | | | - Satyaban Jena
- b Department of Chemistry , Utkal University , Bhubaneswar , Odisha , India
| | | | - Sabita Nayak
- a Department of Chemistry , Ravenshaw University , Cuttack , Odisha , India
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6
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Kuntiyong P, Lee TH, Kranemann CL, White JD. Total synthesis of the marine toxin phorboxazole A using palladium(II)-mediated intramolecular alkoxycarbonylation for tetrahydropyran synthesis. Org Biomol Chem 2012; 10:7884-99. [PMID: 22910851 DOI: 10.1039/c2ob25766a] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The potent antitumor agent phorboxazole A was synthesized from six subunits comprising C1-C2 (115), C3-C8 (98), C9-C19 (74), C20-C32 (52), C33-C41 (84) and C42-C46 (85). Tetrahydropyrans B and C containing cis-2,6-disubstitution were fabricated via palladium(II)-mediated intramolecular alkoxycarbonylation which, in the case of tetrahydropyran C, was carried out with catalytic palladium(II) and p-benzoquinone as the stoichiometric re-oxidant. Tetrahydropyran D was obtained by a stereoselective tin(IV)-catalyzed coupling of a C9 aldehyde with an allylsilane, and the C19-C20 connection was made using a completely stereoselective Wittig-Schlosser (E) olefination. Coupling of the oxazole C32 methyl substituent with the intact C33-C46 δ-lactone 3was accompanied by elimination of the vinyl bromide to a terminal alkyne, but the C32-C33 linkage was implemented successfully with 83 and C33-C41 lactone 84. The C42-C46 segment of the side chain was then appended via Julia-Kocienski olefination. The macrolide portion of phorboxazole A was completed by means of an Ando-Still-Gennari intramolecular (Z)-selective olefination at C2-C3 which required placement of a (dimethoxyphosphinyl)acetate moiety at C24. Final deprotection led to phorboxazole A via a route in which the longest linear sequence is 37 steps and the overall yield is 0.36%.
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Affiliation(s)
- Punlop Kuntiyong
- Department of Chemistry, Oregon State University, Corvallis, Oregon, USA
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Gong D, Zhang L, Yuan C. A Facile Synthesis of 4‐(O,O‐Dialkylphosphoryl)‐1,3‐oxazole by Rhodium‐Catalyzed Heterocycloaddition. SYNTHETIC COMMUN 2011. [DOI: 10.1081/scc-200030540] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Affiliation(s)
- Denghuang Gong
- a Shanghai Institute of Organic Chemistry , Chinese Academy of Sciences , Shanghai, 200032, China
| | - Ling Zhang
- a Shanghai Institute of Organic Chemistry , Chinese Academy of Sciences , Shanghai, 200032, China
| | - Chengye Yuan
- a Shanghai Institute of Organic Chemistry , Chinese Academy of Sciences , Shanghai, 200032, China
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Zhang J, Polishchuk EA, Chen J, Ciufolini MA. Development of an oxazole conjunctive reagent and application to the total synthesis of siphonazoles. J Org Chem 2010; 74:9140-51. [PMID: 19950882 DOI: 10.1021/jo9018705] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The preparation of 4-carbethoxy-5-methyl-2-(phenylsulfonyl)methyloxazole and its use in the elaboration of more complex oxazoles are described. A total synthesis of the unique natural products siphonazoles A and B, illustrates an application of this building block. A discussion of the biological activity of the siphonazoles is also presented.
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Affiliation(s)
- Jianmin Zhang
- Department of Chemistry, University of British Columbia, 2036 Main Mall, Vancouver BC V6T 1Z1, Canada
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Zhang J, Ciufolini MA. Total Synthesis of Siphonazoles by the Use of a Conjunctive Oxazole Building Block. Org Lett 2009; 11:2389-92. [DOI: 10.1021/ol900455m] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.4] [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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13
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Smith AB, Razler TM, Ciavarri JP, Hirose T, Ishikawa T, Meis RM. A Second-Generation Total Synthesis of (+)-Phorboxazole A. J Org Chem 2008; 73:1192-200. [DOI: 10.1021/jo7018152] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Amos B. Smith
- Department of Chemistry, The Penn Center for Molecular Discovery, and Monell Chemical Senses Center, University of Pennsylvania, Philadelphia, Pennsylvania 19104
| | - Thomas M. Razler
- Department of Chemistry, The Penn Center for Molecular Discovery, and Monell Chemical Senses Center, University of Pennsylvania, Philadelphia, Pennsylvania 19104
| | - Jeffrey P. Ciavarri
- Department of Chemistry, The Penn Center for Molecular Discovery, and Monell Chemical Senses Center, University of Pennsylvania, Philadelphia, Pennsylvania 19104
| | - Tomoyasu Hirose
- Department of Chemistry, The Penn Center for Molecular Discovery, and Monell Chemical Senses Center, University of Pennsylvania, Philadelphia, Pennsylvania 19104
| | - Tomoyasu Ishikawa
- Department of Chemistry, The Penn Center for Molecular Discovery, and Monell Chemical Senses Center, University of Pennsylvania, Philadelphia, Pennsylvania 19104
| | - Regina M. Meis
- Department of Chemistry, The Penn Center for Molecular Discovery, and Monell Chemical Senses Center, University of Pennsylvania, Philadelphia, Pennsylvania 19104
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14
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Smith AB, Razler TM, Meis RM, Pettit GR. Synthesis and Biological Evaluation of Phorboxazole Congeners Leading to the Discovery and Preparative-Scale Synthesis of (+)-Chlorophorboxazole A Possessing Picomolar Human Solid Tumor Cell Growth Inhibitory Activity. J Org Chem 2008; 73:1201-8. [DOI: 10.1021/jo701816h] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Amos B. Smith
- Department of Chemistry, The Penn Center for Molecular Discovery, and Monell Chemical Senses Center, University of Pennsylvania, Philadelphia, Pennsylvania 19104, and Cancer Research Institute, Arizona State University, Tempe, Arizona 85287
| | - Thomas M. Razler
- Department of Chemistry, The Penn Center for Molecular Discovery, and Monell Chemical Senses Center, University of Pennsylvania, Philadelphia, Pennsylvania 19104, and Cancer Research Institute, Arizona State University, Tempe, Arizona 85287
| | - Regina M. Meis
- Department of Chemistry, The Penn Center for Molecular Discovery, and Monell Chemical Senses Center, University of Pennsylvania, Philadelphia, Pennsylvania 19104, and Cancer Research Institute, Arizona State University, Tempe, Arizona 85287
| | - George R. Pettit
- Department of Chemistry, The Penn Center for Molecular Discovery, and Monell Chemical Senses Center, University of Pennsylvania, Philadelphia, Pennsylvania 19104, and Cancer Research Institute, Arizona State University, Tempe, Arizona 85287
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15
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Kumar SP, Nagaiah K. Stereoselective synthesis of the C31–C39 unit of (+)-phorboxazoles from m-anisaldehyde. Tetrahedron Lett 2007. [DOI: 10.1016/j.tetlet.2006.12.105] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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16
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White JD, Kuntiyong P, Lee TH. Total Synthesis of Phorboxazole A. 1. Preparation of Four Subunits. Org Lett 2006; 8:6039-42. [PMID: 17165924 DOI: 10.1021/ol062530r] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
[Structure: see text] Four subunits of the potent antitumor agent phorboxazole A were constructed; fragments C20-C32 and C9-C19 containing tetrahydropyrans A and B, respectively, were assembled using palladium-catalyzed intramolecular alkoxycarbonylation.
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Affiliation(s)
- James D White
- Department of Chemistry, Oregon State University, Corvallis, Oregon 97331, USA.
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Li DR, Zhang DH, Sun CY, Zhang JW, Yang L, Chen J, Liu B, Su C, Zhou WS, Lin GQ. Total Synthesis of Phorboxazole B. Chemistry 2006; 12:1185-204. [PMID: 16267861 DOI: 10.1002/chem.200500892] [Citation(s) in RCA: 75] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
An efficient and highly convergent total synthesis of the potent antitumor agent phorboxazole B has been achieved. The synthetic strategy of this synthesis features: 1) a highly efficient substrate-controlled hydrogenation to construct the functionalized cis-tetrahydropyrane unit; 2) iterative crotyl addition to synthesize the segment that contains alternating hydroxyl and methyl substituents; 3) Hg(OAc)2/I2-induced cyclization to establish the cis-tetrahydropyrane moiety; 4) 1,3-asymmetric induction in the Mukaiyama aldol reaction to afford the stereogenic centers at C9 and C3; and 5) the exploration of the Still-Gennari olefination reaction to complete the macrolide ring of phorboxazoloe B.
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Affiliation(s)
- De-Run Li
- Shanghai Institute of Organic Chemistry, 354 Fenglin Rd, Shanghai 200032, PR China
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18
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Abstract
The C1-C17 bis-oxane subunit 22 of phorboxazole B is efficiently synthesized by exploiting differential reactivities between similar substituents on the hydropyran rings in 4. Selective dihydroxylation of the equatorial vinyl group, hydroboration of the axial vinyl group, and intramolecular Mitsunobu lactonization serve to fully differentiate the similar hydropyrans.
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Affiliation(s)
- Brian S Lucas
- Department of Chemistry, University of Wisconsin-Madison, 1101 University Avenue, Madison, Wisconsin 53706-1396, USA
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Smith AB, Razler TM, Ciavarri JP, Hirose T, Ishikawa T. (+)-Phorboxazole A Synthetic Studies. A Highly Convergent, Second Generation Total Synthesis of (+)-Phorboxazole A. Org Lett 2005; 7:4399-402. [PMID: 16178543 DOI: 10.1021/ol051584i] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
[structure: see text] A second generation total synthesis of the potent antitumor agent (+)-phorboxazole A (1) has been achieved. The cornerstone of this approach comprises a more convergent strategy, involving late-stage Stille union of a fully elaborated C(1-28) macrocycle with a C(29-46) side chain. The second generation synthesis entails the longest linear sequence of 24 steps, with an overall yield of 4.2%.
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Affiliation(s)
- Amos B Smith
- Department of Chemistry, Monell Chemical Senses Center, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA.
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20
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Lucas BS, Luther LM, Burke SD. A Catalytic Enantioselective Hetero Diels−Alder Approach to the C20−C32 Segment of the Phorboxazoles. J Org Chem 2005; 70:3757-60. [PMID: 15845024 DOI: 10.1021/jo050034v] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
[reaction: see text] An efficient synthesis of the C20-C32 segment of the phorboxazoles has been achieved using an enantioselective hetero Diels-Alder reaction catalyzed by Jacobsen's Cr(III) amino indanol Schiff base catalyst.
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Affiliation(s)
- Brian S Lucas
- Department of Chemistry, University of Wisconsin, 1101 University Avenue, Madison, Wisconsin 53706-1396, USA
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Wright DL. Furans as versatile synthons for target-oriented and diversity-oriented synthesis. PROGRESS IN HETEROCYCLIC CHEMISTRY 2005. [DOI: 10.1016/s0959-6380(05)80323-x] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
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23
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Li DR, Sun CY, Su C, Lin GQ, Zhou WS. Toward the Total Synthesis of Phorboxazole B: An Efficient Synthesis of the C20−C46 Segment. Org Lett 2004; 6:4261-4. [PMID: 15524458 DOI: 10.1021/ol048275x] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
An efficient synthesis of the C20-C46 segment of phorboxazole B is described. The key steps involved Hg(OAc)(2)/I(2)-induced cyclization to construct the cis-tetrahydropyran moiety, the coupling of the metalated 2-methyloxazole 7 with lactone 6, and Julia olefination to furnish the conjugated diene moiety.
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Affiliation(s)
- De Run Li
- Shanghai Institute of Organic Chemistry, 354 Fenglin Rd, Shanghai 200032, P.R. China
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Williams DR, Kiryanov AA, Emde U, Clark MP, Berliner MA, Reeves JT. Studies of stereocontrolled allylation reactions for the total synthesis of phorboxazole A. Proc Natl Acad Sci U S A 2004; 101:12058-63. [PMID: 15277662 PMCID: PMC514434 DOI: 10.1073/pnas.0402477101] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
A highly convergent total synthesis of the potent anticancer agent (+)-phorboxazole A (1) is accomplished. Four components (3-6) are assembled with considerations for control of absolute and relative stereochemistry. Iterative asymmetric allylation methodology addresses key stereochemical features in the preparation of the 2,6-cis- and 2,6-trans-tetrahydropyranyl rings of the C3-C19 component (3). The stereocontrolled asymmetric allylation process is also used for development of the C28-C41 fragment (4). Novel Barbier coupling reactions of alpha-iodomethyl oxazoles and related thiazoles are described with samarium iodide. The convergent assembly of components 4 and 5 features formation of the fully substituted C22-C26 pyran by intramolecular capture of an allyl cation intermediate with high facial selectivity, and further efforts lead to E-C19/C20 olefination. The synthesis culminates with use of a modified Julia olefination for attachment of the C42-C46 segment and subsequent late-stage macrocyclization by installation of the (Z)-C2/C3 alpha,beta-unsaturated lactone.
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Affiliation(s)
- David R Williams
- Department of Chemistry, Indiana University, 800 East Kirkwood Avenue, Bloomington, IN 47405-7102, USA.
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25
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Run Li D, Qiang Tu Y, Lin GQ, Zhou WS. Studies on the synthesis of phorboxazole B: stereoselective synthesis of the C28–C46 segment. Tetrahedron Lett 2003. [DOI: 10.1016/j.tetlet.2003.09.141] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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26
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Chakraborty TK, Reddy V, Reddy T. Synthesis of highly substituted tetrahydropyrans: preparation of the C20–C28 moiety of phorboxazoles. Tetrahedron 2003. [DOI: 10.1016/j.tet.2003.08.056] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Lucas BS, Burke SD. Palladium(0)-Mediated Desymmetrization of Meso Tetraols: An Approach to the C3−C17 Bis-oxane Segment of Phorboxazoles A and B. Org Lett 2003; 5:3915-8. [PMID: 14535742 DOI: 10.1021/ol0354775] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
[reaction: see text] meso-Tetraol bis(allylic acetates) 2 and 5 were synthesized via two-directional chain elongation. A palladium-mediated, ligand-controlled desymmetrization provided the desired bis-oxanes in greater than 98% ee. Bis-oxanes 1 and 4 represent potential synthetic intermediates for the C3-C17 subunits of phorboxazoles A and B.
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Affiliation(s)
- Brian S Lucas
- Department of Chemistry, University of Wisconsin-Madison, 1101 University Avenue, Madison, Wisconsin 53706-1396, USA
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29
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Paterson I, Luckhurst CA. Toward the total synthesis of phorboxazole A: synthesis of an advanced C4–C32 subunit using the Jacobsen hetero Diels–Alder reaction. Tetrahedron Lett 2003. [DOI: 10.1016/s0040-4039(03)00754-8] [Citation(s) in RCA: 51] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Pattenden G, González MA, Little PB, Millan DS, Plowright AT, Tornos JA, Ye T. Total synthesis of (+)-phorboxazole A, a potent cytostatic agent from the sponge Phorbas sp. Org Biomol Chem 2003; 1:4173-208. [PMID: 14685321 DOI: 10.1039/b308305e] [Citation(s) in RCA: 91] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A convergent total synthesis of phorboxazole A (1a), from the C(3-19), C(20-27) and C(33-46) fragments 5, 4 and 91, respectively, concentrating on stereocontrolled formation of the bonds at C(2-3), C(19-20) and C(27-28), is described. Although a coupling reaction between a macrolide ketone and the side chain substituted sulfone, at C(27-28) was not successful, a Wadsworth-Emmons olefination involving the oxane methyl ketone 4 and an oxazole produced the oxane 90 which was next coupled to 91 leading to the C(20-46) unit 100. A further coupling of 100 to 71c at C(19-20) then led to 105, ultimately, and the synthesis was completed by a macrocyclisation reaction from 105, at the C(2-3) alkene bond, followed by deprotection of 106.
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Affiliation(s)
- Gerald Pattenden
- School of Chemistry, The University of Nottingham, University Park, Nottingham, UK NG7 2RD.
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Synthetic studies directed toward the phorboxazoles: preparation of the C3–C15 bisoxane segment and two stereoisomers. Tetrahedron 2002. [DOI: 10.1016/s0040-4020(02)00613-0] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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32
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Smith AB, Minbiole KP, Verhoest PR, Schelhaas M. Total synthesis of (+)-phorboxazole A exploiting the Petasis-Ferrier rearrangement. J Am Chem Soc 2001; 123:10942-53. [PMID: 11686698 DOI: 10.1021/ja011604l] [Citation(s) in RCA: 177] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A highly convergent, stereocontrolled total synthesis of the potent antiproliferative agent (+)-phorboxazole A (1) has been achieved. Highlights of the synthesis include: modified Petasis-Ferrier rearrangements for assembly of both the C(11-15) and C(22-26) cis-tetrahydropyran rings; extension of the Julia olefination to the synthesis of enol ethers; the design, synthesis, and application of a novel bifunctional oxazole linchpin; and Stille coupling of a C(28) trimethyl stannane with a C(29) oxazole triflate. The longest linear sequence leading to (+)-phorboxazole A (1) was 27 steps, with an overall yield of 3%.
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Affiliation(s)
- A B Smith
- Department of Chemistry, Monell Chemical Senses Center, University of Pennsylvania, Philadelphia, PA 19104, USA
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Smith AB, Verhoest PR, Minbiole KP, Schelhaas M. Total synthesis of (+)-phorboxazole A. J Am Chem Soc 2001; 123:4834-6. [PMID: 11457294 DOI: 10.1021/ja0105055] [Citation(s) in RCA: 71] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- A B Smith
- Department of Chemistry, Monell Chemical Senses Center and Laboratory for Research on the Structure of Matter University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA
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Williams DR, Clark MP, Emde U, Berliner MA. Synthetic studies toward phorboxazole A. stereoselective synthesis of the C(28)-C(46) side chain fragment. Org Lett 2000; 2:3023-6. [PMID: 10986098 DOI: 10.1021/ol0063656] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A stereoselective synthesis of the C(28)-C(46) fragment (3) of phorboxazole A is described. Key advances include an enantioselective allylation to establish the stereochemistry of the tetrahydropyran unit and a useful SmI(2)-mediated modification of the Barbier reaction of iodomethyloxazole 15 with aldehyde 14.
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Affiliation(s)
- D R Williams
- Department of Chemistry, Indiana University, 800 East Kirkwood Avenue, Bloomington, Indiana 47405-7102, USA.
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35
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Evans D, Cee V, Smith T, Fitch D, Cho P. Asymmetric Synthesis of Phorboxazole B—Part I: Synthesis of the C
20
–C
38
and C
39
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46
Subunits. Angew Chem Int Ed Engl 2000. [DOI: 10.1002/1521-3757(20000717)112:14<2633::aid-ange2633>3.0.co;2-#] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- David A. Evans
- Department of Chemistry & Chemical Biology Harvard University Cambridge, MA 02138, USA, Fax: (+1) 617‐495‐1460
| | - Victor J. Cee
- Department of Chemistry & Chemical Biology Harvard University Cambridge, MA 02138, USA, Fax: (+1) 617‐495‐1460
| | - Thomas E. Smith
- Department of Chemistry & Chemical Biology Harvard University Cambridge, MA 02138, USA, Fax: (+1) 617‐495‐1460
| | - Duke M. Fitch
- Department of Chemistry & Chemical Biology Harvard University Cambridge, MA 02138, USA, Fax: (+1) 617‐495‐1460
| | - Patricia S. Cho
- Department of Chemistry & Chemical Biology Harvard University Cambridge, MA 02138, USA, Fax: (+1) 617‐495‐1460
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Synthesis of the C22-C26 tetrahydropyran segment of phorboxazole by a stereoselective prins cyclization. Org Lett 2000; 2:1217-9. [PMID: 10810711 DOI: 10.1021/ol005646a] [Citation(s) in RCA: 112] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
[formula: see text] Tetrahydropyran rings are found in many complex natural products, and the segment-coupling Prins cyclization is an effective strategy for their synthesis. We report a four-step, stereoselective synthesis of the C20-C27 tetrahydropyran segment of phorboxazole. The key step is a Prins cyclization induced by catalytic BF3.OEt2.
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High regio-, chemo-, and stereoselectivity via low-temperature 4 + 3 cycloadditions. Convergent synthesis of multifunctionalized vinylmetals (M = Si, Sn) and S-vinyl benzenecarbothioates. Org Lett 2000; 2:883-6. [PMID: 10768177 DOI: 10.1021/ol991386p] [Citation(s) in RCA: 40] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A series of enantiomerically pure 8-oxabicyclo[3.2.1]oct-6-en-3-ones functionalized in the unsaturated two-carbon bridge has been prepared by the title reaction. Carbocation reactivity has been fined-tuned at -95 degrees C and adjusted to diene nucleophilicity. Conventional electrophilic substitution of 3-silylated and 3-stannylated furan is suppressed in favor of the rapid 4 + 3 cycloaddition mode. In the case of cycloadduct 13A, stereoselectivity (17:1) is perfectly matched to regioselectivity (17:1). High stereoselection as well as unprecedented regioselection and chemoselection is attributed to the low-temperature cycloaddition protocol and the design of chiral auxiliary and tether.
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Wang Y, Zhu S. A rhodium-catalyzed heterocycloaddition route to 5-fluoroalkyl substituted 1,3-oxazoles. J Fluor Chem 2000. [DOI: 10.1016/s0022-1139(99)00306-1] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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Gaertzen O, Misske AM, Wolbers P, Hoffmann H. Synthesis of enantiopure C-glycosides and pseudo C-glycosides: Lewis-acid mediated heterolysis of methyl acetals. Tetrahedron Lett 1999. [DOI: 10.1016/s0040-4039(99)01224-1] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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