1
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Zhang Y, Raugh N, Koert U. Fluorotrifluoromethyl Group Installation: Tetrasubstituted Tertiary Stereocenters Containing C-F and C-CF 3 Bonds via Copper-Mediated Allylic Substitution. Org Lett 2023. [PMID: 37478001 DOI: 10.1021/acs.orglett.3c02032] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/23/2023]
Abstract
Tetrasubstituted tertiary centers containing a fluorotrifluoromethyl (FTF) motif were obtained from secondary 3-fluoro-3-trifluoromethyl allylic phosphates by a copper(I)-mediated allylic substitution reaction using Grignard reagents. The reaction features a broad substrate scope, high γ-regioselectivity, and excellent (E)-stereoselectivity. Two examples of chirality transfer from enantiopure secondary fluorine-substituted allylic phosphates to the corresponding scalemic products indicate the stereoselective potential of the method to install FTF stereocenters.
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Affiliation(s)
- Yingling Zhang
- Department of Chemistry, Philipps University of Marburg, Hans-Meerwein-Straße 4, D-35043 Marburg, Germany
| | - Nils Raugh
- Department of Chemistry, Philipps University of Marburg, Hans-Meerwein-Straße 4, D-35043 Marburg, Germany
| | - Ulrich Koert
- Department of Chemistry, Philipps University of Marburg, Hans-Meerwein-Straße 4, D-35043 Marburg, Germany
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2
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Patil HS, Nikalje MD, Chopade AU, Chopade MU. Enantioselective Reduction of Ketones and Synthesis of 2-Methyl-2,3-dihydro-1-benzofuran Catalyzed by Chiral Spiroborate Ester. RUSSIAN JOURNAL OF ORGANIC CHEMISTRY 2021. [DOI: 10.1134/s1070428021040163] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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3
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Chopade MU, Nikalje MD, Patil HS, Chopade AU. Enantioselective Formal Synthesis of the Cytotoxic Topoisomerase
II Inhibitor Deoxythysanone, Catalyzed by Chiral Spiroborate Ester. RUSSIAN JOURNAL OF ORGANIC CHEMISTRY 2020. [DOI: 10.1134/s1070428020040181] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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4
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Thakur N, Patil RA, Talebi M, Readel ER, Armstrong DW. Enantiomeric impurities in chiral catalysts, auxiliaries, and synthons used in enantioselective syntheses. Part 5. Chirality 2019; 31:688-699. [PMID: 31318099 DOI: 10.1002/chir.23086] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2019] [Revised: 05/10/2019] [Accepted: 05/13/2019] [Indexed: 01/02/2023]
Abstract
The enantiomeric excess of chiral starting materials is one of the important factors determining the enantiopurity of products in asymmetric synthesis. Fifty-one commercially available chiral reagents used as building blocks, catalysts, and auxiliaries in various enantioselective syntheses were assayed for their enantiomeric purity. The test results were classified within five impurities level (ie, <0.01%, 0.01%-0.1%, 0.1%-1%, 1%-10%, >10%). Previously from 1998 to 2013, several reports have been published on the enantiomeric composition of more than 300 chiral reagents. This series of papers is necessitated by the fact that new reagents are forthcoming and that the enantiomeric purity of the same reagent can vary from batch to batch and/or from supplier to supplier. This report presents chiral liquid chromatography (LC) and gas chromatography (GC) methods to separate enantiomers of chiral compounds and evaluate their enantiomeric purities. The accurate and efficient LC analysis was done using newly introduced superficially porous particle (SPP 2.7 μm) based chiral stationary phases (TeicoShell, VancoShell, LarihcShell-P, and NicoShell).
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Affiliation(s)
- Nimisha Thakur
- Department of Chemistry and Biochemistry, University of Texas at Arlington, Arlington, Texas
| | - Rahul A Patil
- Department of Chemistry and Biochemistry, University of Texas at Arlington, Arlington, Texas
| | - Mohsen Talebi
- Department of Chemistry and Biochemistry, University of Texas at Arlington, Arlington, Texas
| | - Elizabeth R Readel
- Department of Chemistry and Biochemistry, University of Texas at Arlington, Arlington, Texas
| | - Daniel W Armstrong
- Department of Chemistry and Biochemistry, University of Texas at Arlington, Arlington, Texas
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5
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Chiral terpene auxiliaries III: spiroborate esters from (1R,2S,3R,5R)-3-amino-apopinan-2-ol as highly effective catalysts for asymmetric reduction of ketones with borane. ACTA ACUST UNITED AC 2015. [DOI: 10.1016/j.tetasy.2015.10.018] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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6
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Lee SA, Sadu VS, Park NJ, Hwang IT, Lee KI. A Practical Synthesis of the Antidepressant (S)-Duloxetine. B KOREAN CHEM SOC 2014. [DOI: 10.5012/bkcs.2014.35.6.1894] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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7
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Stepanenko V, de Jesús M, Garcia C, Barnes CL, Ortiz-Marciales M. Synthesis and stability of new spiroaminoborate esters. Tetrahedron Lett 2012; 53:910-913. [PMID: 22267879 PMCID: PMC3261760 DOI: 10.1016/j.tetlet.2011.12.054] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
Abstract
New spiroaminoborate esters derived from 1,1-diphenylprolinol, ephedrine and dihydroquinine with different alkoxy substituents were prepared as stable crystalline compounds and characterized by spectroscopical analysis and specific rotation. The structure of the spiroborate 4 derived from 1,1-diphenylprolinol and dicyclohexyl-1,1'-diol was confirmed by X-ray analysis.
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Affiliation(s)
- Viatcheslav Stepanenko
- Department of Chemistry, University of Puerto Rico – Humacao, Call Box 860, Humacao, Puerto Rico 00792, USA
| | - Melvin de Jesús
- Department of Chemistry, University of Puerto Rico – Humacao, Call Box 860, Humacao, Puerto Rico 00792, USA
| | - Carmelo Garcia
- Department of Chemistry, University of Puerto Rico – Humacao, Call Box 860, Humacao, Puerto Rico 00792, USA
| | - Charles L. Barnes
- Department of Chemistry, University of Missouri – Columbia, 125 Chemistry Building, Columbia, MO 65211, USA
| | - Margarita Ortiz-Marciales
- Department of Chemistry, University of Puerto Rico – Humacao, Call Box 860, Humacao, Puerto Rico 00792, USA
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8
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Chiral terpene auxiliaries II. Spiroborate esters derived from α-pinene—new catalysts for asymmetric borane reduction of prochiral ketones. Tetrahedron Lett 2011. [DOI: 10.1016/j.tetlet.2011.05.095] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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9
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Huang K, Wang H, Stepanenko V, De Jesús M, Torruellas C, Correa W, Ortiz-Marciales M. Chiral epoxides via borane reduction of 2-haloketones catalyzed by spiroborate ester: application to the synthesis of optically pure 1,2-hydroxy ethers and 1,2-azido alcohols. J Org Chem 2011; 76:1883-6. [PMID: 21294519 PMCID: PMC3055923 DOI: 10.1021/jo102294j] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
An enantioselective borane-mediated reduction of a variety of 2-haloketones with 10% spiroaminoborate ester 1 as catalyst is described. By a simple basic workup of 2-halohydrins, optically active epoxides are obtained in high yield and with excellent enantiopurity (up to 99% ee). Ring-opening of oxiranes with phenoxides or sodium azide is investigated under different reaction conditions affording nonracemic 1,2-hydroxy ethers and 1,2-azido alcohols with excellent enantioselectivity (99% ee) and in good to high chemical yield.
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Affiliation(s)
- Kun Huang
- Department of Chemistry, University of Puerto Rico-Humacao, CUH Station, Humacao, Puerto Rico 00791, USA
| | - Haiyang Wang
- Department of Chemistry, University of Puerto Rico-Humacao, CUH Station, Humacao, Puerto Rico 00791, USA
| | - Viatcheslav Stepanenko
- Department of Chemistry, University of Puerto Rico-Humacao, CUH Station, Humacao, Puerto Rico 00791, USA
| | - Melvin De Jesús
- Department of Chemistry, University of Puerto Rico-Humacao, CUH Station, Humacao, Puerto Rico 00791, USA
| | - Carilyn Torruellas
- Department of Chemistry, University of Puerto Rico-Humacao, CUH Station, Humacao, Puerto Rico 00791, USA
| | - Wildeliz Correa
- Department of Chemistry, University of Puerto Rico-Humacao, CUH Station, Humacao, Puerto Rico 00791, USA
| | - Margarita Ortiz-Marciales
- Department of Chemistry, University of Puerto Rico-Humacao, CUH Station, Humacao, Puerto Rico 00791, USA
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10
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Franz D, Bolte M, Lerner HW, Wagner M. Ditopic hydridoborates and hydridoboranes: bridging ligands in coordination polymers and versatile hydroboration reagents. Dalton Trans 2011; 40:2433-40. [DOI: 10.1039/c0dt01271h] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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11
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Coleridge BM, Angert TP, Marks LR, Hamilton PN, Sutton CP, Matos K, Burkhardt ER. Spiroborate catalyzed reductions with N,N-diethylaniline borane. Tetrahedron Lett 2010. [DOI: 10.1016/j.tetlet.2010.09.022] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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12
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Stepanenko V, De Jesús M, Correa W, Bermúdez L, Vázquez C, Guzmán I, Ortiz-Marciales M. Chiral spiroaminoborate ester as a highly enantioselective and efficient catalyst for the borane reduction of furyl, thiophene, chroman and thiochroman containing ketones. ACTA ACUST UNITED AC 2009; 20:2659-2665. [PMID: 20161579 DOI: 10.1016/j.tetasy.2009.11.009] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Prochiral heteroaryl ketones containing furan, thiophene, chroman and thiochroman moieties were successfully reduced in the presence of 1 - 10 mol % of spiroaminoborate ester 1 with different borane sources to afford non-racemic alcohols in up to 99% ee. In addition, modest enantioselectivity, around 80% ee, was achieved in the reduction of linear α,β-unsaturated heteroaryl ketones.
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Affiliation(s)
- Viatcheslav Stepanenko
- Department of Chemistry, University of Puerto Rico-Humacao, CUH Station Humacao, Puerto Rico 00791, USA
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13
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Huang K, Ortiz-Marciales M, Correa W, Pomales E, López XY. Spiroborate ester-mediated asymmetric synthesis of beta-hydroxy ethers and its conversion to highly enantiopure beta-amino ethers. J Org Chem 2009; 74:4195-202. [PMID: 19413288 PMCID: PMC2767257 DOI: 10.1021/jo900666r] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Borane-mediated reduction of aryl and alkyl ketones with alpha-aryl- and alpha-pyridyloxy groups affords beta-hydroxy ethers in high enantiomeric purity (up to 99% ee) and in good yield, using as catalyst 10 mol % of spiroborate ester 1 derived from (S)-diphenylprolinol. Representative beta-hydroxy ethers are successfully converted to beta-amino ethers, with minor epimerization, by phthalimide substitution under Mitsunobu's conditions followed by hydrazinolysis to obtain primary amino ethers or by imide reduction with borane to afford beta-2,3-dihydro-1H-isoindol ethers. Nonracemic Mexiletine and nAChR analogues with potential biological activity are also synthesized in excellent yield by mesylation of key beta-hydroxy pyridylethers and substitution with five-, six-, and seven-membered ring heterocyclic amines.
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Affiliation(s)
- Kun Huang
- Department of Chemistry, University of Puerto Rico-Humacao, CUH Station, Humacao, Puerto Rico
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14
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Stepanenko V, Ortiz-Marciales M, Barnes CL, Garcia C. Novel dimethoxy(aminoalkoxy)borate derived from (S)-diphenylprolinol as highly efficient catalyst for the enantioselective boron-mediated reduction of prochiral ketones. Tetrahedron Lett 2009; 50:995-998. [PMID: 20160845 PMCID: PMC2654321 DOI: 10.1016/j.tetlet.2008.12.061] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The novel dimethoxyl(aminoalkoxy)borate 1 was isolated as a white crystalline dimer joined by H-bonding as evidenced by X-ray analysis, and demonstrated to be a highly effective catalyst for the asymmetric reduction of representative prochiral ketones with borane-DMS. Optically pure alcohols were obtained using only 1 mol% of catalyst 1 in up to 99% ee.
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Affiliation(s)
- Viatcheslav Stepanenko
- Department of Chemistry, University of Puerto Rico – Humacao, CUH Station, Humacao, Puerto Rico 00791, USA
| | - Margarita Ortiz-Marciales
- Department of Chemistry, University of Puerto Rico – Humacao, CUH Station, Humacao, Puerto Rico 00791, USA
| | - Charles L. Barnes
- Department of Chemistry, University of Missouri –Columbia, 125 Chemistry Building, Columbia, MO 65211, USA
| | - Carmelo Garcia
- Department of Chemistry, University of Puerto Rico – Humacao, CUH Station, Humacao, Puerto Rico 00791, USA
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15
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Svobodová M, Bárta J, Šimůnek P, Bertolasi V, Macháček V. Straightforward access to oxazaborines, diazaborinones and triazaborines by reactions of β-enaminoamides with 4-methylbenzenediazonium tetraphenylborate. J Organomet Chem 2009. [DOI: 10.1016/j.jorganchem.2008.10.004] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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16
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Huang K, Merced FG, Ortiz-Marciales M, Meléndez HJ, Correa W, De Jesús M. Highly enantioselective borane reduction of heteroaryl and heterocyclic ketoxime ethers catalyzed by novel spiroborate ester derived from diphenylvalinol: application to the synthesis of nicotine analogues. J Org Chem 2008; 73:4017-26. [PMID: 18447392 PMCID: PMC2701197 DOI: 10.1021/jo800204n] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
An asymmetric synthesis for the preparation of nonracemic amines bearing heterocyclic and heteroaromatic rings is described. A variety of important enantiopure thionyl and arylalkyl primary amines were afforded by the borane-mediated enantioselective reduction of O-benzyl ketoximes using 10% of catalyst 10 derived from ( S)-diphenylvalinol and ethylene glycol with excellent enantioselectivity, in up to 99% ee. The optimal condition for the first asymmetric reduction of 3- and 4-pyridyl-derived O-benzyl ketoxime ethers was achieved using 30% of catalytic loading in dioxane at 10 degrees C. ( S)- N-ethylnornicotine ( 3) was also successfully synthesized from the TIPS-protected ( S)-2-amino-2-pyridylethanol in 97% ee.
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Affiliation(s)
- Kun Huang
- Department of Chemistry, University of Puerto Rico-Humacao, CUH Station, Humacao, PR 00791, USA
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17
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Spiroborate esters in the borane-mediated asymmetric synthesis of pyridyl and related heterocyclic alcohols. ACTA ACUST UNITED AC 2007; 18:2738-2745. [PMID: 20890455 DOI: 10.1016/j.tetasy.2007.10.044] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
The effectiveness of several spiroborate ester catalysts was investigated in the asymmetric borane reduction of 2-, 3-, 4-acetylpyridines under different reaction conditions. Highly enantiomerically enriched 1-(2-, 3- and 4-pyridyl)ethanols and 1-(heterocyclic)ethanols were obtained using 1 to 10% catalytic loads of the spiroborate 5 derived from diphenylprolinol and ethylene glycol.
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18
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Stepanenko V, De Jesus M, Correa W, Guzman I, Vazquez C, de la Cruz W, Ortiz-Marciales M, Barnes CL. Enantioselective Reduction of Prochiral Ketones using Spiroborate Esters as Catalysts. Tetrahedron Lett 2007; 48:5799-5802. [PMID: 19554205 DOI: 10.1016/j.tetlet.2007.06.086] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
Novel spiroborate esters derived nonracemic 1,2-aminoalcohols and ethylene glycol are reported as highly effective catalysts for the asymmetric borane reduction of a variety of prochiral ketones with borane-dimethyl sulfide complex at room temperature. Optically active alcohols were obtained in excellent chemical yields using 0.1 to 10 mol % of catalysts with up to 99% ee.
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Affiliation(s)
- Viatcheslav Stepanenko
- Department of Chemistry, University of Puerto Rico - Humacao, CUH Station, Humacao, Puerto Rico 00791, USA
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19
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Huang X, Ortiz-Marciales M, Huang K, Stepanenko V, Merced FG, Ayala AM, Correa W, De Jesús M. Asymmetric synthesis of primary amines via the spiroborate-catalyzed borane reduction of oxime ethers. Org Lett 2007; 9:1793-5. [PMID: 17397177 PMCID: PMC2571073 DOI: 10.1021/ol0704791] [Citation(s) in RCA: 54] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
[reaction: see text] The enantioselective borane reduction of O-benzyloxime ethers to primary amines was studied under catalytic conditions using the spiroborate esters 5-10 derived from nonracemic 1,2-amino alcohols and ethylene glycol. Effective catalytic conditions were achieved using only 10% of catalyst 5 derived from diphenylvalinol in dioxane at 0 degrees C resulting in complete conversion to the corresponding primary amine in up to 99% ee.
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20
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Botuha C, Chemla F, Ferreira F, Pérez-Luna A, Roy B. Allenylzinc reagents: new trends and synthetic applications. NEW J CHEM 2007. [DOI: 10.1039/b706541h] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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21
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Bandini M, Bottoni A, Cozzi PG, Miscione GP, Monari M, Pierciaccante R, Umani-Ronchi A. ChiralC2-Boron-Bis(oxazolines) in Asymmetric Catalysis – A Theoretical Study of the Catalyzed Enantioselective Reduction of Ketones Promoted by Catecholborane. European J Org Chem 2006. [DOI: 10.1002/ejoc.200600133] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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