1
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Dooley CJ, Burtea A, Mitilian C, Dao WT, Qu B, Salzameda NT, Rychnovsky SD. Using the Competing Enantioselective Conversion Method to Assign the Absolute Configuration of Cyclic Amines with Bode's Acylation Reagents. J Org Chem 2020; 85:10750-10759. [PMID: 32806106 DOI: 10.1021/acs.joc.0c01275] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
The competing enantioselective conversion (CEC) method is a quick and reliable means to determine absolute configuration. Previously, Bode's chiral acylated hydroxamic acids were used to determine the stereochemistry of primary amines, as well as cyclic and acyclic secondary amines. The enantioselective acylation has been evaluated for 4-, 5-, and 6-membered cyclic secondary amines, including medicinally relevant compounds. The limitations of the method were studied through computational analysis and experimental results. Piperidines with substituents at the 2-position did not behave well unless the axial conformer was energetically accessible, which is consistent with the transition state geometries proposed by Bode and Kozlowski. Control experiments were performed to investigate the cause of degrading selectivity under the CEC reaction conditions. The present study expands the scope of the CEC method for secondary amines and provides a better understanding of the reaction profile.
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Affiliation(s)
- Charles J Dooley
- Department of Chemistry, 1102 Natural Sciences II, University of California at Irvine, Irvine, California 92697, United States
| | - Alexander Burtea
- Department of Chemistry, 1102 Natural Sciences II, University of California at Irvine, Irvine, California 92697, United States
| | - Christina Mitilian
- Department of Chemistry, 1102 Natural Sciences II, University of California at Irvine, Irvine, California 92697, United States
| | - Wendy T Dao
- Department of Chemistry and Biochemistry, California State University Fullerton, Fullerton, California 92834, United States
| | - Bo Qu
- Chemical Development, Boehringer Ingelheim Pharmaceuticals, Inc., 900 Ridgebury Road, Ridgefield, Connecticut 06877, United States
| | - Nicholas T Salzameda
- Department of Chemistry and Biochemistry, California State University Fullerton, Fullerton, California 92834, United States
| | - Scott D Rychnovsky
- Department of Chemistry, 1102 Natural Sciences II, University of California at Irvine, Irvine, California 92697, United States
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2
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Burns AS, Dooley C, Carlson PR, Ziller JW, Rychnovsky SD. Relative and Absolute Structure Assignments of Alkenes Using Crystalline Osmate Derivatives for X-ray Analysis. Org Lett 2019; 21:10125-10129. [DOI: 10.1021/acs.orglett.9b04133] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Alexander S. Burns
- Department of Chemistry, University of California at Irvine, 1102 Natural Sciences II, Irvine, California 92697, United States
| | - Charles Dooley
- Department of Chemistry, University of California at Irvine, 1102 Natural Sciences II, Irvine, California 92697, United States
| | - Paul R. Carlson
- Department of Chemistry, University of California at Irvine, 1102 Natural Sciences II, Irvine, California 92697, United States
| | - Joseph W. Ziller
- Department of Chemistry, University of California at Irvine, 1102 Natural Sciences II, Irvine, California 92697, United States
| | - Scott D. Rychnovsky
- Department of Chemistry, University of California at Irvine, 1102 Natural Sciences II, Irvine, California 92697, United States
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3
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Brummel BR, Lee KG, McMillen CD, Kolis JW, Whitehead DC. One-Pot Absolute Stereochemical Identification of Alcohols via Guanidinium Sulfate Crystallization. Org Lett 2019; 21:9622-9627. [DOI: 10.1021/acs.orglett.9b03792] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Beau R. Brummel
- Department of Chemistry, Clemson University, Clemson, South Carolina 29634, United States
| | - Kinsey G. Lee
- Department of Chemistry, Clemson University, Clemson, South Carolina 29634, United States
| | - Colin D. McMillen
- Department of Chemistry, Clemson University, Clemson, South Carolina 29634, United States
| | - Joseph W. Kolis
- Department of Chemistry, Clemson University, Clemson, South Carolina 29634, United States
| | - Daniel C. Whitehead
- Department of Chemistry, Clemson University, Clemson, South Carolina 29634, United States
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4
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Burns AS, Ross CC, Rychnovsky SD. Heteroatom-Directed Acylation of Secondary Alcohols To Assign Absolute Configuration. J Org Chem 2018; 83:2504-2515. [PMID: 29424546 DOI: 10.1021/acs.joc.7b03156] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Birman's HBTM catalyst is effective for the enantioselective acylation and kinetic resolution of benzylic secondary alcohols. The enantioselective acylation has now been extended to secondary alcohols bearing electron-withdrawing groups such as halides and other heteroatoms. The level of selectivity is modest to good and is sufficient for determining configuration using the competing enantioselective conversion method. A mathematical analysis identifies conditions for achieving maximum differences in conversion and, consequently, assigning configuration with greater confidence. The new method is effective for halohydrins and secondary-tertiary 1,2-diols and was used to confirm the configuration of two inoterpene natural products.
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Affiliation(s)
- Alexander S Burns
- Department of Chemistry, 1102 Natural Sciences II, University of California at Irvine , Irvine, California 92697, United States
| | - Christopher C Ross
- Department of Chemistry, 1102 Natural Sciences II, University of California at Irvine , Irvine, California 92697, United States
| | - Scott D Rychnovsky
- Department of Chemistry, 1102 Natural Sciences II, University of California at Irvine , Irvine, California 92697, United States
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5
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Wang L, Jin Z, Wang X, Zeng S, Sun C, Pan Y. Pair of Stereodynamic Chiral Benzylicaldehyde Probes for Determination of Absolute Configuration of Amino Acid Residues in Peptides by Mass Spectrometry. Anal Chem 2017; 89:11902-11907. [DOI: 10.1021/acs.analchem.7b03804] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Lin Wang
- College
of Pharmaceutical Sciences, Zhejiang University, Hangzhou 310058, Zhejiang, China
- Department
of Chemistry and Chemical Engineering, Beijing University of Technology, 100124, Beijing, China
- Department
of Chemistry, Zhejiang University, Hangzhou 310027, Zhejiang, China
| | - Zhe Jin
- Department
of Chemistry, Zhejiang University, Hangzhou 310027, Zhejiang, China
| | - Xiayan Wang
- Department
of Chemistry and Chemical Engineering, Beijing University of Technology, 100124, Beijing, China
| | - Su Zeng
- College
of Pharmaceutical Sciences, Zhejiang University, Hangzhou 310058, Zhejiang, China
| | - Cuirong Sun
- College
of Pharmaceutical Sciences, Zhejiang University, Hangzhou 310058, Zhejiang, China
| | - Yuanjiang Pan
- Department
of Chemistry, Zhejiang University, Hangzhou 310027, Zhejiang, China
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6
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Burtea A, Rychnovsky SD. Determination of the Absolute Configuration of Cyclic Amines with Bode’s Chiral Hydroxamic Esters Using the Competing Enantioselective Conversion Method. Org Lett 2017; 19:4195-4198. [DOI: 10.1021/acs.orglett.7b01748] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Alexander Burtea
- Department of Chemistry, University of California at Irvine, 1102 Natural Sciences II, Irvine, California 92697, United States
| | - Scott D. Rychnovsky
- Department of Chemistry, University of California at Irvine, 1102 Natural Sciences II, Irvine, California 92697, United States
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7
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Burns AS, Wagner AJ, Fulton JL, Young K, Zakarian A, Rychnovsky SD. Determination of the Absolute Configuration of β-Chiral Primary Alcohols Using the Competing Enantioselective Conversion Method. Org Lett 2017; 19:2953-2956. [PMID: 28508638 PMCID: PMC6364845 DOI: 10.1021/acs.orglett.7b01189] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
A method for determining the absolute configuration of β-chiral primary alcohols has been developed. Enantioenriched alcohols were acylated in the presence of either enantiomer of the enantioselective acylation catalyst HBTM, and the faster reaction was determined by measuring product conversion using 1H NMR spectroscopic analysis. An empirical mnemonic was developed that correlates the absolute configuration of the alcohol to the faster reacting catalyst. Successful substrates for this method include primary alcohols that bear a "directing group" on the stereogenic center; directing groups include arenes, heteroarenes, enones, and halides.
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Affiliation(s)
- Alexander S. Burns
- Department of Chemistry, University of
California at Irvine, 1102 Natural Sciences II, Irvine, California 92697, United
States
| | - Alexander J. Wagner
- Department of Chemistry, University of
California at Irvine, 1102 Natural Sciences II, Irvine, California 92697, United
States
| | - Jennifer L. Fulton
- Department of Chemistry, University of
California at Irvine, 1102 Natural Sciences II, Irvine, California 92697, United
States
| | - Kyle Young
- Department of Chemistry and Biochemistry,
University of California, Santa Barbara, California 93106, United States
| | - Armen Zakarian
- Department of Chemistry and Biochemistry,
University of California, Santa Barbara, California 93106, United States
| | - Scott. D. Rychnovsky
- Department of Chemistry, University of
California at Irvine, 1102 Natural Sciences II, Irvine, California 92697, United
States
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8
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Huang PQ, Huang YH, Xiao KJ. Metal-Free Intermolecular Coupling of Arenes with Secondary Amides: Chemoselective Synthesis of Aromatic Ketimines and Ketones, and N-Deacylation of Secondary Amides. J Org Chem 2016; 81:9020-9027. [PMID: 27603045 DOI: 10.1021/acs.joc.6b01647] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
The direct transformation of common secondary amides into aromatic ketimines and aromatic ketones with C-C bond formation is described. The reaction can also be used for N-deacylation of secondary amides to release amines. This method consists of in situ amide activation with triflic anhydride and intermolecular capture of the resulting highly electrophilic nitrilium intermediate with an arene. The reaction is applicable to various kinds of secondary amides (electrophiles), but only electron-rich and moderately electron-rich arenes can be used as nucleophiles. Thanks to the use of bench stable arenes instead of reactive and basic organometallics as nucleophiles, the reaction proceeded with high chemoselectivity at the secondary amido group in the presence of a series of sensitive functional groups such as aldehyde, ketone, ester, cyano, nitro, and tertiary amido groups. The reaction can be viewed as a Friedel-Crafts-type reaction using secondary amides as acylating agents or as an intermolecular version of the Bischler-Napieralski reaction.
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Affiliation(s)
- Pei-Qiang Huang
- Department of Chemistry and Fujian Provincial Key Laboratory of Chemical Biology, Collaborative Innovation Centre of Chemistry for Energy Materials (iChEM), College of Chemistry and Chemical Engineering, Xiamen University , Xiamen, Fujian 361005, P. R. China.,State Key Laboratory of Elemento-Organic Chemistry, Nankai University , Tianjin 300071, P. R. China
| | - Ying-Hong Huang
- Department of Chemistry and Fujian Provincial Key Laboratory of Chemical Biology, Collaborative Innovation Centre of Chemistry for Energy Materials (iChEM), College of Chemistry and Chemical Engineering, Xiamen University , Xiamen, Fujian 361005, P. R. China
| | - Kai-Jiong Xiao
- Department of Chemistry and Fujian Provincial Key Laboratory of Chemical Biology, Collaborative Innovation Centre of Chemistry for Energy Materials (iChEM), College of Chemistry and Chemical Engineering, Xiamen University , Xiamen, Fujian 361005, P. R. China
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9
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Wagner AJ, Miller SM, King RP, Rychnovsky SD. Nanomole-Scale Assignment and One-Use Kits for Determining the Absolute Configuration of Secondary Alcohols. J Org Chem 2016; 81:6253-65. [DOI: 10.1021/acs.joc.6b00816] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Alexander J. Wagner
- Department of Chemistry, University of California-Irvine, 1102 Natural Sciences II, Irvine, California 92697, United States
| | - Shawn M. Miller
- Department of Chemistry, University of California-Irvine, 1102 Natural Sciences II, Irvine, California 92697, United States
| | - Ryan P. King
- Department of Chemistry, University of California-Irvine, 1102 Natural Sciences II, Irvine, California 92697, United States
| | - Scott D. Rychnovsky
- Department of Chemistry, University of California-Irvine, 1102 Natural Sciences II, Irvine, California 92697, United States
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10
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Peng R, Lin L, Zhang Y, Wu W, Lu Y, Liu X, Feng X. The assignment of the configuration for α-hydroxy acid esters using a CEC strategy. Org Biomol Chem 2016; 14:5258-62. [PMID: 27189590 DOI: 10.1039/c6ob00927a] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A simple and efficient (1)H NMR method for determining the absolute configuration of chiral α-hydroxy acid esters using a competing enantioselective conversion (CEC) strategy was developed. The α-hydroxy acid esters were acylated in the presence of Feng's chiral N,N'-dioxide-scandium(iii) complex, and the faster reaction was identified when one enantiomer of the chiral α-hydroxy acid ester was treated with both enantiomers of the ligand by NMR analysis of the reaction mixture without further purification. A mnemonic is presented to aid the assignment of the absolute configuration of the substrates.
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Affiliation(s)
- Ruixue Peng
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, P. R. China.
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11
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Meador DS, Spivak DA. Absolute Configuration Determination Using Enantiomeric Pairs of Molecularly Imprinted Polymers. Org Lett 2014; 16:1402-5. [DOI: 10.1021/ol500173y] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Danielle S. Meador
- Department
of Chemistry, 232 Choppin
Hall, Louisiana State University, Baton
Rouge, Louisiana 70803, United States
| | - David A. Spivak
- Department
of Chemistry, 232 Choppin
Hall, Louisiana State University, Baton
Rouge, Louisiana 70803, United States
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12
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Wagner AJ, Rychnovsky SD. Kinetic Analysis of the HBTM-Catalyzed Esterification of an Enantiopure Secondary Alcohol. Org Lett 2013; 15:5504-7. [DOI: 10.1021/ol402643n] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Alexander J. Wagner
- Department of Chemistry, 1102 Natural Sciences II, University of California−Irvine, Irvine, California, 92697, United States
| | - Scott D. Rychnovsky
- Department of Chemistry, 1102 Natural Sciences II, University of California−Irvine, Irvine, California, 92697, United States
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13
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LeGay CM, Boudreau CG, Derksen DJ. Elucidating absolute configuration of unsaturated alcohols via enantioselective acylation reactions. Org Biomol Chem 2013; 11:3432-5. [PMID: 23619624 DOI: 10.1039/c3ob40709h] [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
Enantioselective nucleophilic acylation catalysis provides a simple method of determining absolute configuration for unsaturated alcohols. Extension of this technique to natural products and synthetic compounds, as well as current limitations of this approach, are also described.
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Affiliation(s)
- Christina M LeGay
- Department of Chemistry, St. Francis Xavier University, Physical Sciences Complex, 5009 Chapel Square, Antigonish, NS B2G 2W5, Canada
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14
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Wagner AJ, Rychnovsky SD. Determination of absolute configuration of secondary alcohols using thin-layer chromatography. J Org Chem 2013; 78:4594-8. [PMID: 23593963 PMCID: PMC3702370 DOI: 10.1021/jo400432q] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
A new implementation of the competing enantioselective conversion (CEC) method was developed to qualitatively determine the absolute configuration of enantioenriched secondary alcohols using thin-layer chromatography. The entire process for the method requires approximately 60 min and utilizes micromole quantities of the secondary alcohol being tested. A number of synthetically relevant secondary alcohols are presented. Additionally, (1)H NMR spectroscopy was conducted on all samples to provide evidence of reaction conversion that supports the qualitative method presented herein.
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Affiliation(s)
- Alexander J. Wagner
- Department of Chemistry, 1102 Natural Sciences II, University of California-Irvine Irvine, California, 92627, United States
| | - Scott D. Rychnovsky
- Department of Chemistry, 1102 Natural Sciences II, University of California-Irvine Irvine, California, 92627, United States
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15
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Perry MA, Trinidad JV, Rychnovsky SD. Absolute Configuration of Lactams and Oxazolidinones Using Kinetic Resolution Catalysts. Org Lett 2013; 15:472-5. [DOI: 10.1021/ol303239t] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Affiliation(s)
- Matthew A. Perry
- Department of Chemistry, 1102 Natural Sciences II, University of California, Irvine, Irvine, California 92697, United States
| | - Jonathan V. Trinidad
- Department of Chemistry, 1102 Natural Sciences II, University of California, Irvine, Irvine, California 92697, United States
| | - Scott D. Rychnovsky
- Department of Chemistry, 1102 Natural Sciences II, University of California, Irvine, Irvine, California 92697, United States
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