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Thomas AY, Walls Iii TL, Nelson BN, Primeaux SW, Chanda PB. Temperature- and Reagent-Controlled Complementary Syn- and Anti-Selective Enolboration-Aldolization of Substituted Phenylacetates. J Org Chem 2021; 86:6184-6194. [PMID: 33835804 DOI: 10.1021/acs.joc.0c03024] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
In contrast to methyl phenylacetates, methyl arylacetates do not provide syn-aldols in the dicyclohexylboron triflate/triethylamine (Chx2BOTf/Et3N)-mediated enolboration-aldolization reaction. However, a combination of a less bulky boron reagent (dibutylboron triflate, n-Bu2BOTf), a bulky amine (i-Pr2NEt), and ambient temperature is required to obtain syn-aldols from methyl arylacetates. The corresponding anti-aldol products have been synthesized by the enolboration-aldolization of methyl arylacetates in the presence of Chx2BOTf/Et3N at a lower temperature. We report the first example of a complementary syn- and anti-selective enolboration-aldolization of arylacetates.
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Affiliation(s)
- Angela Y Thomas
- Department of Chemistry and Physics, Southeastern Louisiana University, Hammond, Louisiana 70402, United States
| | - Tommy L Walls Iii
- Department of Chemistry and Physics, Southeastern Louisiana University, Hammond, Louisiana 70402, United States
| | - Brionna N Nelson
- Department of Chemistry and Physics, Southeastern Louisiana University, Hammond, Louisiana 70402, United States
| | - Stafford W Primeaux
- Department of Chemistry and Physics, Southeastern Louisiana University, Hammond, Louisiana 70402, United States
| | - Prem B Chanda
- Department of Chemistry and Physics, Southeastern Louisiana University, Hammond, Louisiana 70402, United States
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2
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Affiliation(s)
- Lona Dutta
- Organic Synthesis and Catalysis Lab Department of Chemical Sciences Indian Institute of Science Education and Research (IISER) Mohali Knowledge City, Sector 81, S. A. S. Nagar Manauli PO Punjab 140306 India
| | - Atanu Mondal
- Organic Synthesis and Catalysis Lab Department of Chemical Sciences Indian Institute of Science Education and Research (IISER) Mohali Knowledge City, Sector 81, S. A. S. Nagar Manauli PO Punjab 140306 India
| | - S. S. V. Ramasastry
- Organic Synthesis and Catalysis Lab Department of Chemical Sciences Indian Institute of Science Education and Research (IISER) Mohali Knowledge City, Sector 81, S. A. S. Nagar Manauli PO Punjab 140306 India
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3
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Yevglevskis M, Lee GL, Sun J, Zhou S, Sun X, Kociok-Köhn G, James TD, Woodman TJ, Lloyd MD. A study on the AMACR catalysed elimination reaction and its application to inhibitor testing. Org Biomol Chem 2016; 14:612-622. [PMID: 26537174 PMCID: PMC4718014 DOI: 10.1039/c5ob01541c] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2015] [Accepted: 10/27/2015] [Indexed: 12/15/2022]
Abstract
α-Methylacyl-CoA racemase (AMACR; P504S) catalyses a key step in the degradation of branched-chain fatty acids and is important for the pharmacological activation of Ibuprofen and related drugs. Levels of AMACR are increased in prostate and other cancers, and it is a drug target. Development of AMACR as a drug target is hampered by lack of a convenient assay. AMACR irreversibly catalyses the elimination of HF from 3-fluoro-2-methylacyl-CoA substrates, and this reaction was investigated for use as an assay. Several known inhibitors and alternative substrates reduced conversion of 3-fluoro-2-methyldecanoyl-CoA by AMACR, as determined by (1)H NMR. The greatest reduction of activity was observed with known potent inhibitors. A series of novel acyl-CoA esters with aromatic side chains were synthesised for testing as chromophoric substrates. These acyl-CoA esters were converted to unsaturated products by AMACR, but their use was limited by non-enzymatic elimination. Fluoride sensors were also investigated as a method of quantifying released fluoride and thus AMACR activity. These sensors generally suffered from high background signal and lacked reproducibility under the assay conditions. In summary, the elimination reaction can be used to characterise inhibitors, but it was not possible to develop a convenient colorimetric or fluorescent assay using 3-fluoro-2-methylacyl-CoA substrates.
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Affiliation(s)
- Maksims Yevglevskis
- Medicinal Chemistry , Department of Pharmacy & Pharmacology , University of Bath , Claverton Down , Bath BA2 7AY , UK . ; Fax: +44 (0)1225 386114
| | - Guat L. Lee
- Medicinal Chemistry , Department of Pharmacy & Pharmacology , University of Bath , Claverton Down , Bath BA2 7AY , UK . ; Fax: +44 (0)1225 386114
| | - Jenny Sun
- Medicinal Chemistry , Department of Pharmacy & Pharmacology , University of Bath , Claverton Down , Bath BA2 7AY , UK . ; Fax: +44 (0)1225 386114
- Department of Pharmacy , Shandong University , People's Republic of China
| | - Shiyi Zhou
- Medicinal Chemistry , Department of Pharmacy & Pharmacology , University of Bath , Claverton Down , Bath BA2 7AY , UK . ; Fax: +44 (0)1225 386114
- Department of Pharmacy , Shandong University , People's Republic of China
| | - Xiaolong Sun
- Department of Chemistry , University of Bath , Claverton Down , Bath BA2 7AY , UK
| | - Gabriele Kociok-Köhn
- Department of Chemistry , University of Bath , Claverton Down , Bath BA2 7AY , UK
| | - Tony D. James
- Department of Chemistry , University of Bath , Claverton Down , Bath BA2 7AY , UK
| | - Timothy J. Woodman
- Medicinal Chemistry , Department of Pharmacy & Pharmacology , University of Bath , Claverton Down , Bath BA2 7AY , UK . ; Fax: +44 (0)1225 386114
| | - Matthew D. Lloyd
- Medicinal Chemistry , Department of Pharmacy & Pharmacology , University of Bath , Claverton Down , Bath BA2 7AY , UK . ; Fax: +44 (0)1225 386114
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Affiliation(s)
- Atsushi Abiko
- Department of Biobased Materials Science, Graduate School of Science and Technology, Kyoto Institute of Technology, Matsugasaki, Sakyo-ku, Kyoto, 606-8585, Japan
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Chaves MR, Moran PJ, Rodrigues JAR. Regio- and enantioselective bioreduction of methyleneketoesters using both polymeric resin and cellulose matrix. ACTA ACUST UNITED AC 2013. [DOI: 10.1016/j.molcatb.2013.09.018] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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6
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Overriding effect of temperature over reagent and substrate size for boron-mediated aldol reaction of methyl phenylacetate. Tetrahedron Lett 2013. [DOI: 10.1016/j.tetlet.2013.08.106] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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7
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Allais C, Nuhant P, Roush WR. (Diisopinocampheyl)borane-mediated reductive aldol reactions of acrylate esters: enantioselective synthesis of anti-aldols. Org Lett 2013; 15:3922-5. [PMID: 23885946 DOI: 10.1021/ol401679g] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The (diisopinocampheyl)borane promoted reductive aldol reaction of acrylate esters 4 is described. Isomerization of the kinetically formed Z(O)-enolborinate 5Z to the thermodynamic E(O)-enolborinate 5E via 1,3-boratropic shifts, followed by treatment with representative achiral aldehydes, leads to anti-α-methyl-β-hydroxy esters 9 or 10 with excellent diastereo- (up to ≥20:1 dr) and enantioselectivity (up to 87% ee). The results of double asymmetric reactions of 5E with several chiral aldehydes are also presented.
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Affiliation(s)
- Christophe Allais
- Department of Chemistry, Scripps Florida, Jupiter, Florida 33458, USA
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8
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Nuhant P, Allais C, Roush WR. Diisopinocampheylborane-Mediated Reductive Aldol Reactions: Highly Enantio- and Diastereoselective Synthesis ofsynAldols fromN-Acryloylmorpholine. Angew Chem Int Ed Engl 2013. [DOI: 10.1002/ange.201302535] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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9
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Nuhant P, Allais C, Roush WR. Diisopinocampheylborane-mediated reductive aldol reactions: highly enantio- and diastereoselective synthesis of syn aldols from N-acryloylmorpholine. Angew Chem Int Ed Engl 2013; 52:8703-7. [PMID: 23818095 DOI: 10.1002/anie.201302535] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2013] [Indexed: 11/08/2022]
Affiliation(s)
- Philippe Nuhant
- Department of Chemistry, The Scripps Research Institute, 130 Scripps Way, 3A2, Jupiter, FL 33458, USA
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Ramachandran PV, Chanda PB. Enantioselective synthesis of anti- and syn-β-hydroxy-α-phenyl carboxylates via boron-mediated asymmetric aldol reaction. Chem Commun (Camb) 2013; 49:3152-4. [PMID: 23478288 DOI: 10.1039/c3cc40860d] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A reagent-controlled, diastereo- and enantioselective synthesis of anti- and syn-β-hydroxy-α-phenyl carboxylates has been achieved by the proper choice of solvent, temperature, alkoxy group, and amine for the diisopinocampheylboron-mediated asymmetric enolization-aldolization of phenylacetates. The pure diastereomers can be readily separated by column chromatography.
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Affiliation(s)
- P Veeraraghavan Ramachandran
- Hebert C. Brown Centre for Borane Research, Purdue University, 560 Oval Drive, West Lafayette, IN 47907-2084, USA.
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11
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Zhu Y, Burgess K. Highly Stereoselective Syntheses of All 1,2,3-Me,OH,MeTriadsviaAsymmetric Hydrogenation Reactions. Adv Synth Catal 2013. [DOI: 10.1002/adsc.201200709] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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12
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Veeraraghavan Ramachandran P, Parthasarathy G, Gagare PD. Preparation and application of 2-(arylmethoxy)isopinocampheols for the asymmetric aldol reaction of 3,3,3-trifluoropropionates. Tetrahedron Lett 2011. [DOI: 10.1016/j.tetlet.2011.08.034] [Citation(s) in RCA: 6] [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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13
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Ferreiro-Mederos L, Vila-Gisbert S, Urbano A, Carreño MC, Colobert F. Stereoselective synthesis of the C15-C26 fragment of the antitumor agent (-)-dictyostatin. Org Biomol Chem 2010; 9:758-64. [PMID: 21082125 DOI: 10.1039/c0ob00491j] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The synthesis of the C15-C26 fragment of (-)-dictyostatin is reported in 10 steps and 28% overall yield. The key steps are the two stereoselective sulfoxide-directed processes: a Reformatsky-type reaction and a β-keto sulfoxide reduction.
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Affiliation(s)
- Leticia Ferreiro-Mederos
- Departamento de Química Orgánica (Módulo 01), Universidad Autónoma de Madrid, 28049, Madrid, Spain
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Ramachandran PV, Parthasarathy G, Gagare PD. Bis-exo-2-norbornylboron Triflate for Stereospecific Enolization of 3,3,3-Trifluoropropionates. Org Lett 2010; 12:4474-7. [PMID: 20849128 DOI: 10.1021/ol1016178] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
| | | | - Pravin D. Gagare
- Department of Chemistry, Purdue University, 560 Oval Drive, West Lafayette, Indiana 47907-2084
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Paterson I, Britton R, Delgado O, Gardner NM, Meyer A, Naylor GJ, Poullennec KG. Total synthesis of (−)-dictyostatin, a microtubule-stabilising anticancer macrolide of marine sponge origin. Tetrahedron 2010. [DOI: 10.1016/j.tet.2010.01.083] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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16
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Yadav JS, Rajender V. Studies Directed Towards the Total Synthesis of (-)-Dictyostatin. European J Org Chem 2010. [DOI: 10.1002/ejoc.200901448] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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