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Rithchumpon P, Intakaew N, Khamto N, Yimklan S, Nimmanpipug P, Thavornyutikarn P, Meepowpan P. Synthesis and application of methyl itaconate-anthracene adducts in configuration assignment of chiral secondary alcohols by 1H NMR. Org Biomol Chem 2021; 19:8955-8967. [PMID: 34581721 DOI: 10.1039/d1ob01387d] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Novel chiral derivatising agents (CDAs) such as methyl itaconate-anthracene adducts (MIAs) were reported for the absolute configuration determination of chiral secondary alcohols by the 1H NMR technique. These adducts were facilely prepared through well-known reactions, and furthermore, commercially available starting materials. According to these synthetic routes, the desired MIAs were afforded in 6 steps with 49% overall yield from dimethyl itaconate. Moreover, the represented MIAs provided significantly large differences of chemical shift values (ΔδSR). No racemisation from the tertiary characteristics of the adjacent alpha carbon was observed.
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Affiliation(s)
- Puracheth Rithchumpon
- Department of Chemistry, Faculty of Science, Chiang Mai University, 239 Huay Kaew Road, Chiang Mai, 50200, Thailand. .,Graduate School, Chiang Mai University, 239 Huay Kaew Road, Chiang Mai 50200, Thailand
| | - Neeranuth Intakaew
- Department of Chemistry, Faculty of Science, Chiang Mai University, 239 Huay Kaew Road, Chiang Mai, 50200, Thailand. .,Graduate School, Chiang Mai University, 239 Huay Kaew Road, Chiang Mai 50200, Thailand.,Center of Excellence for Innovation in Chemistry (PERCH-CIC), Faculty of Science, Chiang Mai University, 239 Huay Kaew Road, Chiang Mai 50200, Thailand
| | - Nopawit Khamto
- Department of Chemistry, Faculty of Science, Chiang Mai University, 239 Huay Kaew Road, Chiang Mai, 50200, Thailand. .,Graduate School, Chiang Mai University, 239 Huay Kaew Road, Chiang Mai 50200, Thailand
| | - Saranpong Yimklan
- Department of Chemistry, Faculty of Science, Chiang Mai University, 239 Huay Kaew Road, Chiang Mai, 50200, Thailand.
| | - Piyarat Nimmanpipug
- Department of Chemistry, Faculty of Science, Chiang Mai University, 239 Huay Kaew Road, Chiang Mai, 50200, Thailand.
| | - Praput Thavornyutikarn
- Department of Chemistry, Faculty of Science, Chiang Mai University, 239 Huay Kaew Road, Chiang Mai, 50200, Thailand.
| | - Puttinan Meepowpan
- Department of Chemistry, Faculty of Science, Chiang Mai University, 239 Huay Kaew Road, Chiang Mai, 50200, Thailand. .,Center of Excellence for Innovation in Chemistry (PERCH-CIC), Faculty of Science, Chiang Mai University, 239 Huay Kaew Road, Chiang Mai 50200, Thailand.,Center of Excellence in Materials Science and Technology, Faculty of Science, Chiang Mai University, 239 Huay Kaew Road, Chiang Mai 50200, Thailand
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2
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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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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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Dascalu AE, Ghinet A, Lipka E, Collinet M, Rigo B, Billamboz M. Cesium salts as superior catalysts for solvent-free modifications of biosourced pterolactam. MOLECULAR CATALYSIS 2019. [DOI: 10.1016/j.mcat.2019.03.003] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
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5
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Lee SR, Park HB, Kim KH. Highly Sensitive, Simple, and Cost- and Time-Effective Method to Determine the Absolute Configuration of a Secondary Alcohol Using Competing Enantioselective Acylation Coupled with LC/MS. Anal Chem 2018; 90:13212-13216. [DOI: 10.1021/acs.analchem.8b03385] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Affiliation(s)
- Seoung Rak Lee
- School of Pharmacy, Sungkyunkwan University, Suwon 16419, Republic of Korea
| | - Hyun Bong Park
- Department of Chemistry, Yale University, New Haven, Connecticut 06520, United States
- Chemical Biology Institute, Yale University, West Haven, Connecticut 06516, United States
| | - Ki Hyun Kim
- School of Pharmacy, Sungkyunkwan University, Suwon 16419, Republic of Korea
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6
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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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7
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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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8
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Zhang Z, Collum DB. Evans Enolates: Structures and Mechanisms Underlying the Aldol Addition of Oxazolidinone-Derived Boron Enolates. J Org Chem 2017; 82:7595-7601. [PMID: 28686020 DOI: 10.1021/acs.joc.7b01365] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The soft enolization of an acylated oxazolidinone using di-n-butylboron triflate (n-Bu2BOTf) and trialkylamines and subsequent aldol addition was probed structurally and mechanistically using a combination of IR and NMR spectroscopies. None of the species along the reaction coordinate show a penchant for aggregating. Complexation of the acylated oxazolidinone by n-Bu2BOTf was too rapid to monitor, as was the subsequent enolization with Et3N (triethylamine). The preformed n-Bu2BOTf·Et3N complex, displaying muted Lewis acidity and affiliated tractable rates, reveals a rate-limiting complexation via a transition structure with a complicated counterion. n-Bu2BOTf·i-Bu3N bearing a hindered amine shifts the rate-limiting step to proton transfer. Rate studies show that the aldol addition with isobutyraldehyde occurs as proffered by others.
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Affiliation(s)
- Zirong Zhang
- Department of Chemistry and Chemical Biology Baker Laboratory, Cornell University , Ithaca, New York 14853-1301, United States
| | - David B Collum
- Department of Chemistry and Chemical Biology Baker Laboratory, Cornell University , Ithaca, New York 14853-1301, United States
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9
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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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10
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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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11
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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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12
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Tallmadge EH, Collum DB. Evans Enolates: Solution Structures of Lithiated Oxazolidinone-Derived Enolates. J Am Chem Soc 2015; 137:13087-95. [PMID: 26437278 PMCID: PMC4765922 DOI: 10.1021/jacs.5b08207] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
The results of a combination of (6)Li and (13)C NMR spectroscopic and computational studies of oxazolidinone-based lithium enolates-Evans enolates-in tetrahydrofuran (THF) solution revealed a mixture of dimers, tetramers, and oligomers (possibly ladders). The distribution depended on the structure of the oxazolidinone auxiliary, substituent on the enolate, and THF concentration (in THF/toluene mixtures). The unsolvated tetrameric form contained a D(2d)-symmetric core structure, whereas the dimers were determined experimentally and computationally to be trisolvates with several isomeric forms.
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Affiliation(s)
- Evan H Tallmadge
- Baker Laboratory, Department of Chemistry and Chemical Biology, Cornell University , Ithaca, New York 14853-1301, United States
| | - David B Collum
- Baker Laboratory, Department of Chemistry and Chemical Biology, Cornell University , Ithaca, New York 14853-1301, United States
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13
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Okamoto S, Sakai Y, Watanabe S, Nishi S, Yoneyama A, Katsumata H, Kosaki Y, Sato R, Shiratori M, Shibuno M, Shishido T. Structure–activity relationship of dihydroimidazo-, dihydropyrimido, tetrahydrodiazepino-[2,1-b]-thiazoles, and -benzothiazoles as an acylation catalyst. Tetrahedron Lett 2014. [DOI: 10.1016/j.tetlet.2014.01.135] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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14
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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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15
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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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16
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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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17
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Ranieri B, Robles O, Romo D. Concise Synthesis of the Isothiourea Organocatalysts Homobenzotetramisole and Derivatives. J Org Chem 2013; 78:6291-6. [DOI: 10.1021/jo400603n] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Beatrice Ranieri
- Department of Chemistry, Texas A&M University, P.O. Box 30012, College Station, Texas 77842-3012, United States
| | - Omar Robles
- Department of Chemistry, Texas A&M University, P.O. Box 30012, College Station, Texas 77842-3012, United States
| | - Daniel Romo
- Department of Chemistry, Texas A&M University, P.O. Box 30012, College Station, Texas 77842-3012, United States
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18
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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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Morrill LC, Douglas J, Lebl T, Slawin AMZ, Fox DJ, Smith AD. Isothiourea-mediated asymmetric Michael-lactonisation of trifluoromethylenones: a synthetic and mechanistic study. Chem Sci 2013. [DOI: 10.1039/c3sc51791h] [Citation(s) in RCA: 103] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
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