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Trost BM, Machacek MR, Aponick A. Predicting the stereochemistry of diphenylphosphino benzoic acid (DPPBA)-based palladium-catalyzed asymmetric allylic alkylation reactions: a working model. Acc Chem Res 2006; 39:747-60. [PMID: 17042475 DOI: 10.1021/ar040063c] [Citation(s) in RCA: 433] [Impact Index Per Article: 22.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Palladium-catalyzed asymmetric allylic alkylation has proven to be a powerful method for the preparation of a wide variety of chiral compounds and the rapid assembly of complex molecular architecture from simple starting materials. While many types of catalyst systems have been successfully employed with certain systems, diphenylphosphino benzoic acid (DPPBA) based ligands have found use over a broad range of substrate classes. This Account highlights the mechanistic aspects considered when designing reactions with DPPBA-based ligands and presents a working model for the a priori prediction of their stereochemical outcome.
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Research Support, N.I.H., Extramural |
19 |
433 |
2
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Aponick A, Li CY, Malinge J, Marques EF. An Extremely Facile Synthesis of Furans, Pyrroles, and Thiophenes by the Dehydrative Cyclization of Propargyl Alcohols. Org Lett 2009; 11:4624-7. [DOI: 10.1021/ol901901m] [Citation(s) in RCA: 208] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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16 |
208 |
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Goodwin JA, Aponick A. Regioselectivity in the Au-catalyzed hydration and hydroalkoxylation of alkynes. Chem Commun (Camb) 2015; 51:8730-41. [DOI: 10.1039/c5cc00120j] [Citation(s) in RCA: 130] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
The issue of regioselectivity in the Au-catalyzed hydration and hydroalkoxylation of alkynes is a perpetual challenge that essentially remains an unsolved problem with respect to general solutions.
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130 |
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Biannic B, Aponick A. Gold‐Catalyzed Dehydrative Transformations of Unsaturated Alcohols. European J Org Chem 2011. [DOI: 10.1002/ejoc.201100858] [Citation(s) in RCA: 116] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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14 |
116 |
5
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Aponick A, Li CY, Palmes JA. Au-Catalyzed Cyclization of Monopropargylic Triols: An Expedient Synthesis of Monounsaturated Spiroketals. Org Lett 2008; 11:121-4. [DOI: 10.1021/ol802491m] [Citation(s) in RCA: 104] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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104 |
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Cardoso FSP, Abboud KA, Aponick A. Design, preparation, and implementation of an imidazole-based chiral biaryl P,N-ligand for asymmetric catalysis. J Am Chem Soc 2013; 135:14548-51. [PMID: 24044433 DOI: 10.1021/ja407689a] [Citation(s) in RCA: 100] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
A new strategy for increasing the barrier to rotation in biaryls has been developed that allows for the incorporation of 5-membered aromatic heterocycles into chiral atropisomers. Using this concept, an imidazole-based biaryl P,N-ligand has been designed and prepared as a single enantiomer. This ligand performs exceptionally well in the enantioselective A(3)-coupling, demonstrating the potential of this new design element.
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Journal Article |
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100 |
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17 |
96 |
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Pappoppula M, Cardoso FSP, Garrett BO, Aponick A. Enantioselective Copper-Catalyzed Quinoline Alkynylation. Angew Chem Int Ed Engl 2015; 54:15202-6. [DOI: 10.1002/anie.201507848] [Citation(s) in RCA: 91] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2015] [Indexed: 11/08/2022]
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10 |
91 |
9
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Trost BM, Aponick A. Palladium-catalyzed asymmetric allylic alkylation of meso- and dl-1,2-divinylethylene carbonate. J Am Chem Soc 2006; 128:3931-3. [PMID: 16551099 PMCID: PMC2531165 DOI: 10.1021/ja0578348] [Citation(s) in RCA: 77] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The palladium-catalyzed asymmetric allylic alkylation of a 1:1 mixture of dl- and meso-1,2-divinylethylene carbonate is reported. For the first time, both the ionization and nucleophilic addition steps of the catalytic cycle act as enantiodiscriminating steps to give a single product in high enantiomeric excess. The reactions proceed in >98% ee to efficiently generate useful chiral building blocks from acrolein. The absolute and relative configurations of iso-cladospolide B and 11-epi-iso-cladospolide B were verified by total synthesis, solving an apparent discrepancy in the literature.
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Research Support, N.I.H., Extramural |
19 |
77 |
10
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Aponick A, Biannic B. Chirality Transfer in Au-Catalyzed Cyclization Reactions of Monoallylic Diols: Selective Access to Specific Enantiomers Based on Olefin Geometry. Org Lett 2011; 13:1330-3. [DOI: 10.1021/ol200203k] [Citation(s) in RCA: 65] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
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14 |
65 |
11
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Ghebreghiorgis T, Biannic B, Kirk BH, Ess DH, Aponick A. The Importance of Hydrogen Bonding to Stereoselectivity and Catalyst Turnover in Gold-Catalyzed Cyclization of Monoallylic Diols. J Am Chem Soc 2012; 134:16307-18. [DOI: 10.1021/ja306333a] [Citation(s) in RCA: 61] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
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13 |
61 |
12
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Aponick A, Biannic B, Jong MR. A highly adaptable catalyst/substrate system for the synthesis of substituted chromenes. Chem Commun (Camb) 2010; 46:6849-51. [DOI: 10.1039/c0cc01961e] [Citation(s) in RCA: 58] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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15 |
58 |
13
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Ketcham JM, Biannic B, Aponick A. The tandem intermolecular hydroalkoxylation/Claisen rearrangement. Chem Commun (Camb) 2012; 49:4157-9. [PMID: 23160013 DOI: 10.1039/c2cc37166a] [Citation(s) in RCA: 55] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The Au(I)-catalyzed intermolecular hydroalkoxylation of alkynes with allylic alcohols to provide allyl vinyl ethers that subsequently undergo Claisen rearrangement is reported. This new cascade reaction strategy facilitates the direct formation of γ,δ-unsaturated ketones from simple starting materials in a single step.
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Research Support, Non-U.S. Gov't |
13 |
55 |
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Paioti PHS, Abboud KA, Aponick A. Catalytic Enantioselective Synthesis of Amino Skipped Diynes. J Am Chem Soc 2016; 138:2150-3. [PMID: 26855017 DOI: 10.1021/jacs.5b13387] [Citation(s) in RCA: 54] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
The Cu-catalyzed synthesis of nonracemic 3-amino skipped diynes via an enantiodetermining C-C bond formation is described using StackPhos as ligand. Despite challenging issues of reactivity and stereoselectivity inherent to these chiral skipped diynes, the reaction tolerates an extremely broad substrate scope with respect to all components and provides the title compounds in excellent enantiomeric excess. The alkyne moieties are demonstrated here to be useful synthetic handles, and 3-amino skipped diynes are convenient building blocks for enantioselective synthesis.
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Research Support, U.S. Gov't, Non-P.H.S. |
9 |
54 |
15
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Mishra S, Liu J, Aponick A. Enantioselective Alkyne Conjugate Addition Enabled by Readily Tuned Atropisomeric P,N-Ligands. J Am Chem Soc 2017; 139:3352-3355. [DOI: 10.1021/jacs.7b00363] [Citation(s) in RCA: 48] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
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48 |
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Trost BM, Aponick A, Stanzl BN. A Convergent Pd-Catalyzed Asymmetric Allylic Alkylation ofdl- andmeso-Divinylethylene Carbonate: Enantioselective Synthesis of (+)-Australine Hydrochloride and Formal Synthesis of Isoaltholactone. Chemistry 2007; 13:9547-60. [PMID: 17847148 DOI: 10.1002/chem.200700832] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
The use of a mixture of dl- and meso-divinylethylene carbonate as an electrophile in palladium-catalyzed asymmetric allylic alkylation reactions is reported. From the diastereomeric mixture of meso and chiral racemic starting materials, a single product is obtained in high optical purity employing either oxygen or nitrogen nucleophiles. The resulting dienes have proven to be versatile synthetic intermediates as each carbon is functionalized for further transformation and differentiated by virtue of the reaction. A mechanism for this intriguing transformation is proposed and a concise enantioselective total synthesis of (+)-australine hydrochloride is reported as well as a formal synthesis of isoaltholactone.
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47 |
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de Oliveira Silva J, Angnes RA, Menezes da Silva VH, Servilha BM, Adeel M, Braga AAC, Aponick A, Correia CRD. Intermolecular Noncovalent Hydroxy-Directed Enantioselective Heck Desymmetrization of Cyclopentenol: Computationally Driven Synthesis of Highly Functionalized cis-4-Arylcyclopentenol Scaffolds. J Org Chem 2016; 81:2010-8. [DOI: 10.1021/acs.joc.5b02846] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
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9 |
47 |
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Aponick A, Palmes J. Strategies for Spiroketal Synthesis Based on Transition-Metal Catalysis. SYNTHESIS-STUTTGART 2012. [DOI: 10.1055/s-0032-1317489] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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13 |
47 |
19
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Paioti PHS, Abboud KA, Aponick A. Incorporation of Axial Chirality into Phosphino-Imidazoline Ligands for Enantioselective Catalysis. ACS Catal 2017. [DOI: 10.1021/acscatal.7b00133] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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45 |
20
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Pappoppula M, Aponick A. Enantioselective Total Synthesis of (-)-Martinellic Acid. Angew Chem Int Ed Engl 2015; 54:15827-30. [PMID: 26572506 DOI: 10.1002/anie.201507849] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2015] [Revised: 09/26/2015] [Indexed: 11/07/2022]
Abstract
An enantioselective total synthesis of martinellic acid is described. The pyrroloquinoline alkaloid core is efficiently prepared from a quinoline, employing a method which relies on a newly developed Cu-catalyzed enantioselective alkynylation using the chiral imidazole-based biaryl P,N ligand StackPhos to establish the absolute stereochemistry. The remaining carbon atoms are then installed by means of a diastereoselective Pd-catalyzed decarboxylative allylation and the synthesis is completed after straightforward functional-group manipulation. This new synthetic method enables the most concise enantioselective synthesis of this important class of molecules to date.
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Research Support, U.S. Gov't, Non-P.H.S. |
10 |
39 |
21
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Markovic M, Ben-Shabat S, Aponick A, Zimmermann EM, Dahan A. Lipids and Lipid-Processing Pathways in Drug Delivery and Therapeutics. Int J Mol Sci 2020; 21:ijms21093248. [PMID: 32375338 PMCID: PMC7247327 DOI: 10.3390/ijms21093248] [Citation(s) in RCA: 38] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2020] [Revised: 04/28/2020] [Accepted: 05/02/2020] [Indexed: 12/19/2022] Open
Abstract
The aim of this work is to analyze relevant endogenous lipid processing pathways, in the context of the impact that lipids have on drug absorption, their therapeutic use, and utilization in drug delivery. Lipids may serve as biomarkers of some diseases, but they can also provide endogenous therapeutic effects for certain pathological conditions. Current uses and possible clinical benefits of various lipids (fatty acids, steroids, triglycerides, and phospholipids) in cancer, infectious, inflammatory, and neurodegenerative diseases are presented. Lipids can also be conjugated to a drug molecule, accomplishing numerous potential benefits, one being the improved treatment effect, due to joined influence of the lipid carrier and the drug moiety. In addition, such conjugates have increased lipophilicity relative to the parent drug. This leads to improved drug pharmacokinetics and bioavailability, the ability to join endogenous lipid pathways and achieve drug targeting to the lymphatics, inflamed tissues in certain autoimmune diseases, or enable overcoming different barriers in the body. Altogether, novel mechanisms of the lipid role in diseases are constantly discovered, and new ways to exploit these mechanisms for the optimal drug design that would advance different drug delivery/therapy aspects are continuously emerging.
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Review |
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38 |
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Markovic M, Ben‐Shabat S, Keinan S, Aponick A, Zimmermann EM, Dahan A. Lipidic prodrug approach for improved oral drug delivery and therapy. Med Res Rev 2018; 39:579-607. [DOI: 10.1002/med.21533] [Citation(s) in RCA: 37] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2018] [Revised: 07/26/2018] [Accepted: 07/27/2018] [Indexed: 12/13/2022]
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37 |
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Biannic B, Ghebreghiorgis T, Aponick A. A comparative study of the Au-catalyzed cyclization of hydroxy-substituted allylic alcohols and ethers. Beilstein J Org Chem 2011; 7:802-7. [PMID: 21804875 PMCID: PMC3135158 DOI: 10.3762/bjoc.7.91] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2011] [Accepted: 05/24/2011] [Indexed: 11/23/2022] Open
Abstract
The Au(I)-catalyzed cyclization of hydroxyallylic ethers to form tetrahydropyrans is reported. Employing (acetonitrile)[(o-biphenyl)di-tert-butylphosphine]gold(I) hexafluoroantimonate, the cyclization reactions were complete within minutes to hours, depending on the substrate. The reaction progress was monitored by GC, and comparisons between substrates demonstrate that reactions of allylic alcohols are faster than the corresponding ethers. Additionally, it is reported that Reaxa QuadraPureTM MPA is an efficient scavenging reagent that halts the reaction progress.
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Journal Article |
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Borrero NV, Aponick A. Total Synthesis of Acortatarin A Using a Pd(II)-Catalyzed Spiroketalization Strategy. J Org Chem 2012; 77:8410-6. [DOI: 10.1021/jo301835e] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
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13 |
32 |
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Paioti PHS, Ketcham JM, Aponick A. Controlling Regiochemistry in the Gold-Catalyzed Synthesis of Unsaturated Spiroketals. Org Lett 2014; 16:5320-3. [DOI: 10.1021/ol5024954] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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11 |
32 |