1
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Bhangare DN, Shinde RG, Pawar PD, Nikalje MD, Lokhande MN. Catalytic Sc(
OTf
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3
mediated direct asymmetric aldol reaction of (−)‐menthyl isothiocyanatoacetate with aldehydes by using (−)‐menthol as chiral auxiliary. J Heterocycl Chem 2021. [DOI: 10.1002/jhet.4286] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Dattatraya N. Bhangare
- Department of Chemistry Savitribai Phule Pune University Pune India
- Department of Chemistry Government of Maharashtra's Ismail Yusuf College Jogeshwari(E) Mumbai India
| | - Rohit G. Shinde
- Department of Chemistry Savitribai Phule Pune University Pune India
| | | | | | - Mahendra N. Lokhande
- Department of Chemistry Avvaiyar Government College for Women Karaikal Puducherry (U.T.) India
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2
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Alnajjar MA, Nau WM, Hennig A. A reference scale of cucurbit[7]uril binding affinities. Org Biomol Chem 2021; 19:8521-8529. [PMID: 34378628 DOI: 10.1039/d1ob01304a] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
The accurate determination of ultra-high binding affinities in supramolecular host-guest chemistry is a challenging endeavour because direct binding titrations are generally limited to affinities <106 M-1 due to sensitivity constraints of common titration methods. To determine higher affinities, competitive titrations are usually performed, in which one compound with a well established binding affinity serves as a reference. Herein, we propose a reference scale for such competitive titrations with the host cucurbit[7]uril (CB7) comprising binding affinities in the range from 103 to 1015 M-1. The suggested reference compounds are commercially available and will aid in the future determination of CB7 binding affinities for stimuli-responsive host-guest systems.
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Affiliation(s)
- Mohammad A Alnajjar
- Department of Life Sciences and Chemistry, Jacobs University Bremen, Campus Ring 1, 28759 Bremen, Germany.
| | - Werner M Nau
- Department of Life Sciences and Chemistry, Jacobs University Bremen, Campus Ring 1, 28759 Bremen, Germany.
| | - Andreas Hennig
- Department of Life Sciences and Chemistry, Jacobs University Bremen, Campus Ring 1, 28759 Bremen, Germany. .,Institute of Chemistry of New Materials, Universität Osnabrück, Barbarastr. 7, 49080 Osnabrück, Germany.
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3
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Malinski TJ, Bazzi HS, Bergbreiter DE. Sustainable Hydrocarbon Oligomer Solvent Systems for Sequestration of Trace Organics from Water. CHEMSUSCHEM 2019; 12:416-419. [PMID: 30548209 DOI: 10.1002/cssc.201802851] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/05/2018] [Indexed: 06/09/2023]
Abstract
Low-viscosity poly(α-olefin)s (PAOs) either alone or with functional hydrocarbon oligomer cosolvents are nontoxic, nonvolatile, recyclable solvent systems that effectively and efficiently sequester trace amounts of nonpolar organic compounds such as benzene and halogenated organics from water. More polar compounds including perfluorooctanoic acid and nitrobenzene or water-miscible compounds such as THF and triethylamine can also be sequestered if the PAO phase contains an H-bonding PAO-anchored cosolvent.
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Affiliation(s)
- Thomas J Malinski
- Department of Chemistry, Texas A&M University, P.O. Box 30012, College Station, TX, 77842-3012, USA
| | - Hassan S Bazzi
- Department of Chemistry, Texas A&M University at Qatar, P.O. Box 23874, Doha, Qatar
| | - David E Bergbreiter
- Department of Chemistry, Texas A&M University, P.O. Box 30012, College Station, TX, 77842-3012, USA
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4
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Nath N, Bordoloi P, Barman B, Baishya B, Chaudhari SR. Insight into old and new pure shift nuclear magnetic resonance methods for enantiodiscrimination. MAGNETIC RESONANCE IN CHEMISTRY : MRC 2018; 56:876-892. [PMID: 29411898 DOI: 10.1002/mrc.4719] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/30/2017] [Revised: 01/20/2018] [Accepted: 01/23/2018] [Indexed: 06/08/2023]
Abstract
Enantiodiscrimination and their quantification using nuclear magnetic resonance (NMR) spectroscopy has always been a subject of great interest. Proton is the nucleus of choice for enantiodiscrimination due to its high sensitivity and ubiquitous presence in nature. Despite its advantages, enantiodiscrimination suffers from extensive signal splitting by the proton-proton scalar couplings, which give complex multiplets that spread over a frequency range of some tens of hertz. These multiplets often overlap, further complicating interpretation of the spectra and quantifications. In the present review, we discuss some of the recent developments in the pure shift 1 H NMR based methods for enantiomer resolution and enantiodiscrimination. We also compare various pure shift methods used for enantiodiscrimination and measurement of enantiomeric excess, considering the fact that conventional 1 H NMR fails to provide any detailed insight.
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Affiliation(s)
- Nilamoni Nath
- Department of Chemistry, Gauhati University, Guwahati, Assam, 781014, India
| | - Priyakshi Bordoloi
- Department of Chemistry, Gauhati University, Guwahati, Assam, 781014, India
| | - Bhaskar Barman
- Department of Chemistry, Gauhati University, Guwahati, Assam, 781014, India
| | - Bikash Baishya
- Centre of Biomedical Research, SGPGIMS Campus, Lucknow, Uttar Pradesh, 226014, India
| | - Sachin R Chaudhari
- School of Chemistry, University of Nottingham, University Park, Nottingham, NG7 2RD, UK
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5
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Da Silva Pinto S, Davies SG, Fletcher AM, Roberts PM, Thomson JE. Diastereoselective Ammonium-Directed Epoxidation in the Asymmetric Syntheses of Dihydroconduramines (+)-C-2, (-)-C-2, (+)-D-2, (+)-E-2, (+)-F-2, and (-)-F-2. J Org Chem 2018; 83:9939-9957. [PMID: 30037221 DOI: 10.1021/acs.joc.8b01359] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Epoxidations (40% aq HBF4 then m-CPBA) of racemic cis-2-( N-benzylamino)cyclohex-3-en-1-ol and racemic cis-2-( N, N-dibenzylamino)cyclohex-3-en-1-ol proceed with very high levels of diastereoselectivity (>95:5 dr). The latter is in direct contrast to the epoxidation of the corresponding trans-diastereoisomer (which proceeds with essentially no selectivity), showing that the relative configuration of the substrate dramatically influences the diastereoselectivity in these instances. Meanwhile, epoxidations of enantiopure (1 R,2 S,α R)-2-[( N-α-methylbenzyl)amino]cyclohex-3-en-1-ol and (1 S,2 R,α R)-2-[( N-α-methylbenzyl)amino]cyclohex-3-en-1-ol [surrogates for the enantiomers of cis-2-( N-benzylamino)cyclohex-3-en-1-ol] proceed with complete diastereoselectivity (>95:5 dr) under the same conditions, showing that neither the presence of the α-methyl group nor the relative configuration of the α-methylbenzyl stereocenter have an effect upon the established level of diastereoslectivity in these cases. In contrast, epoxidations of enantiopure (1 R,2 S,α R)-2-[ N-benzyl- N-(α-methylbenzyl)amino]cyclohex-3-en-1-ol and (1 S,2 R,α R)-2-[ N-benzyl- N-(α-methylbenzyl)amino]cyclohex-3-en-1-ol [surrogates for the enantiomers of cis-2-( N, N-dibenzylamino)cyclohex-3-en-1-ol] proceed with lower diastereoselectivity (∼70:30 dr). Thus, the presence of the α-methyl group has a detrimental effect on the established level of diastereoselectivity in these cases (although again the relative configuration of the α-methylbenzyl stereocenter is unimportant). The diastereoselective epoxidation pathway is used to enable the asymmetric syntheses of six hitherto unknown, enantiopure dihydroconduramines (+)-C-2, (-)-C-2, (+)-D-2, (+)-E-2, (+)-F-2, and (-)-F-2 (>99% ee in each case).
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Affiliation(s)
- Solange Da Silva Pinto
- Department of Chemistry, Chemistry Research Laboratory , University of Oxford , Mansfield Road , Oxford OX1 3TA , U.K
| | - Stephen G Davies
- Department of Chemistry, Chemistry Research Laboratory , University of Oxford , Mansfield Road , Oxford OX1 3TA , U.K
| | - Ai M Fletcher
- Department of Chemistry, Chemistry Research Laboratory , University of Oxford , Mansfield Road , Oxford OX1 3TA , U.K
| | - Paul M Roberts
- Department of Chemistry, Chemistry Research Laboratory , University of Oxford , Mansfield Road , Oxford OX1 3TA , U.K
| | - James E Thomson
- Department of Chemistry, Chemistry Research Laboratory , University of Oxford , Mansfield Road , Oxford OX1 3TA , U.K
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Ota K, Yamashita T, Kohno S, Miura A, Kamaike K, Miyaoka H. Formal synthesis of cis-solamin: acid-catalyzed one-step construction of 2,5-disubstituted tetrahydrofuran. Org Biomol Chem 2018; 16:3018-3025. [PMID: 29634057 DOI: 10.1039/c8ob00603b] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
A divergent strategy has been used for the concise and efficient enantioselective formal synthesis of Annonaceous acetogenin cis-solamin. Our synthetic strategy comprises concise preparation of the diepoxyester via an 11-membered silaketal constructed by ring-closing metathesis after the dimerization of chiral epoxides, and uses an acid-catalyzed tandem intramolecular SN2-like reaction to construct the threo-cis-threo configuration of the tetrahydrofuran-diol moiety.
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Affiliation(s)
- Koichiro Ota
- School of Pharmacy, Tokyo University of Pharmacy and Life Sciences, 1432-1 Horinouchi, Hachioji, Tokyo 192-0392, Japan.
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7
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Gümüş MK, Gorobets NY, Sedash YV, Chebanov VA, Desenko SM. A modified Biginelli reaction toward oxygen-bridged tetrahydropyrimidines fused with substituted 1,2,4-triazole ring. Chem Heterocycl Compd (N Y) 2018. [DOI: 10.1007/s10593-018-2204-3] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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8
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Armstrong RJ, García‐Ruiz C, Myers EL, Aggarwal VK. Stereodivergent Olefination of Enantioenriched Boronic Esters. Angew Chem Int Ed Engl 2017; 56:786-790. [PMID: 27958668 PMCID: PMC5347846 DOI: 10.1002/anie.201610387] [Citation(s) in RCA: 55] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2016] [Indexed: 11/17/2022]
Abstract
A stereodivergent coupling reaction between vinyl halides and boronic esters is described. This coupling process proceeds without a transition-metal catalyst, instead proceeding by electrophilic selenation or iodination of a vinyl boronate complex followed by stereospecific syn or anti elimination. Chiral, nonracemic boronic esters could be coupled with complete enantiospecificity. The process enables the highly stereoselective synthesis of either the E or Z alkene from a single isomer of a vinyl coupling partner.
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Affiliation(s)
- Roly J. Armstrong
- School of ChemistryUniversity of BristolCantock's CloseBristolBS8 1TSUK
| | | | - Eddie L. Myers
- School of ChemistryUniversity of BristolCantock's CloseBristolBS8 1TSUK
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9
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Armstrong RJ, García‐Ruiz C, Myers EL, Aggarwal VK. Stereodivergent Olefination of Enantioenriched Boronic Esters. Angew Chem Int Ed Engl 2016. [DOI: 10.1002/ange.201610387] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Roly J. Armstrong
- School of Chemistry University of Bristol Cantock's Close Bristol BS8 1TS UK
| | | | - Eddie L. Myers
- School of Chemistry University of Bristol Cantock's Close Bristol BS8 1TS UK
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Harrell ML, Malinski T, Torres-López C, Gonzalez K, Suriboot J, Bergbreiter DE. Alternatives for Conventional Alkane Solvents. J Am Chem Soc 2016; 138:14650-14657. [DOI: 10.1021/jacs.6b07967] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Mary L. Harrell
- Department of Chemistry, Texas A&M University, College Station, Texas 77842-3012, United States
| | - Thomas Malinski
- Department of Chemistry, Texas A&M University, College Station, Texas 77842-3012, United States
| | - Coralys Torres-López
- Department of Chemistry, Texas A&M University, College Station, Texas 77842-3012, United States
| | - Kimberly Gonzalez
- Department of Chemistry, Texas A&M University, College Station, Texas 77842-3012, United States
| | - Jakkrit Suriboot
- Department of Chemistry, Texas A&M University, College Station, Texas 77842-3012, United States
| | - David E. Bergbreiter
- Department of Chemistry, Texas A&M University, College Station, Texas 77842-3012, United States
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11
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Schenk DJ, Dormer PG, Hesk D, Pollack SR, Lavey CF. NMR-based approach to the analysis of radiopharmaceuticals: radiochemical purity, specific activity, and radioactive concentration values by proton and tritium NMR spectroscopy. J Labelled Comp Radiopharm 2015; 58:291-8. [PMID: 26014438 DOI: 10.1002/jlcr.3295] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2014] [Revised: 02/16/2015] [Accepted: 04/01/2015] [Indexed: 11/12/2022]
Abstract
Compounds containing tritium are widely used across the drug discovery and development landscape. These materials are widely utilized because they can be efficiently synthesized and produced at high specific activity. Results from internally calibrated (3)H and (1)H nuclear magnetic resonance (NMR) spectroscopy suggests that at least in some cases, this calibrated approach could supplement or potentially replace radio-high-performance liquid chromatography for radiochemical purity, dilution and scintillation counting for the measurement of radioactivity per volume, and liquid chromatography/mass spectrometry analysis for the determination of specific activity. In summary, the NMR-derived values agreed with those from the standard approaches to within 1% to 9% for solution count and specific activity. Additionally, the NMR-derived values for radiochemical purity deviated by less than 5%. A benefit of this method is that these values may be calculated at the same time that (3)H NMR analysis provides the location and distribution of tritium atoms within the molecule. Presented and discussed here is the application of this method, advantages and disadvantages of the approach, and a rationale for utilizing internally calibrated (1)H and (3)H NMR spectroscopy for specific activity, radioactive concentration, and radiochemical purity whenever acquiring (3)H NMR for tritium location.
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Affiliation(s)
- David J Schenk
- Process and Analytical Chemistry, Merck Research Laboratories, 126 E. Lincoln Avenue, Rahway, NJ, 07065, USA
| | - Peter G Dormer
- Process and Analytical Chemistry, Merck Research Laboratories, 126 E. Lincoln Avenue, Rahway, NJ, 07065, USA
| | - David Hesk
- Process and Analytical Chemistry, Merck Research Laboratories, 126 E. Lincoln Avenue, Rahway, NJ, 07065, USA
| | - Scott R Pollack
- Process and Analytical Chemistry, Merck Research Laboratories, 126 E. Lincoln Avenue, Rahway, NJ, 07065, USA
| | - Carolee Flader Lavey
- Process and Analytical Chemistry, Merck Research Laboratories, 126 E. Lincoln Avenue, Rahway, NJ, 07065, USA
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12
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González-de-Castro Á, Broughton H, Martínez-Pérez JA, Espinosa JF. Conformational features of secondary N-cyclopropyl amides. J Org Chem 2015; 80:3914-20. [PMID: 25803271 DOI: 10.1021/acs.joc.5b00236] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
NMR studies in conjunction with ab initio calculations revealed unexpected conformational behavior of N-cyclopropylacetamide (1). This secondary amide displays 16-19% E-rotamer (cis) around the carbonyl-nitrogen bond in apolar solvents, in contrast to other aliphatic secondary acetamides in which significant E-rotamer populations are rare due to steric contacts between the substituents on the amide bond. In addition, 1 adopts an ortho conformation around the N-cPr bond instead of the anti conformation generally preferred by secondary acetamides. This distinct conformational behavior was also observed for other secondary N-cyclopropyl amides.
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Affiliation(s)
| | - Howard Broughton
- Centro de Investigación Lilly, Avda. de la Industria, 30, 28108-Alcobendas, Madrid, Spain
| | - José A Martínez-Pérez
- Centro de Investigación Lilly, Avda. de la Industria, 30, 28108-Alcobendas, Madrid, Spain
| | - Juan F Espinosa
- Centro de Investigación Lilly, Avda. de la Industria, 30, 28108-Alcobendas, Madrid, Spain
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13
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Risi RM, Maza AM, Burke SD. Asymmetric Hydroformylation-Initiated Tandem Sequences for Syntheses of (+)-Patulolide C, (−)-Pyrenophorol, (+)-Decarestrictine L, and (+)-Prelog Djerassi Lactone. J Org Chem 2014; 80:204-16. [DOI: 10.1021/jo502301k] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Roberto M. Risi
- Department
of Chemistry, University of Wisconsin—Madison, 1101 University Avenue, Madison, Wisconsin 53706, United States
| | - Andrew M. Maza
- Department
of Chemistry, University of Wisconsin—Madison, 1101 University Avenue, Madison, Wisconsin 53706, United States
| | - Steven D. Burke
- Department
of Chemistry, University of Wisconsin—Madison, 1101 University Avenue, Madison, Wisconsin 53706, United States
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Dai Z, Green TK. Synthesis of aromatic sphingosine analogues by diastereoselective amination of enantioenriched trans-γ,δ-unsaturated β-hydroxyesters. J Org Chem 2014; 79:7778-84. [PMID: 25046474 DOI: 10.1021/jo501533g] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
An effective route to N-Boc-protected aromatic sphingosine analogues is accomplished. The strategy is based on the diastereoselective amination of enantioenriched trans-γ,δ-unsaturated β-hydroxyesters to establish anti,N-Boc-α-hydrazino-β-hydroxyesters. Nonreductive E1cB elimination is essential for the successful N-N bond cleavage of hydrazine while preserving the trans double bond. Either the (3R,2S) and (3S,2R) enantiomer of N-Boc-protected sphingosine analogues has been synthesized in five steps with excellent optical purity with ∼99% ee and >99% de.
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Affiliation(s)
- Zhipeng Dai
- Department of Chemistry and Biochemistry, Institute of Arctic Biology, University of Alaska , Fairbanks, Alaska 99775, United States
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15
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Liang Y, Harrell ML, Bergbreiter DE. Using Soluble Polymers to Enforce Catalyst-Phase-Selective Solubility and as Antileaching Agents to Facilitate Homogeneous Catalysis. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201402805] [Citation(s) in RCA: 5] [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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Liang Y, Harrell ML, Bergbreiter DE. Using Soluble Polymers to Enforce Catalyst-Phase-Selective Solubility and as Antileaching Agents to Facilitate Homogeneous Catalysis. Angew Chem Int Ed Engl 2014; 53:8084-7. [DOI: 10.1002/anie.201402805] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2014] [Indexed: 11/09/2022]
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Laurieri N, Dairou J, Egleton JE, Stanley LA, Russell AJ, Dupret JM, Sim E, Rodrigues-Lima F. From arylamine N-acetyltransferase to folate-dependent acetyl CoA hydrolase: impact of folic acid on the activity of (HUMAN)NAT1 and its homologue (MOUSE)NAT2. PLoS One 2014; 9:e96370. [PMID: 24823794 PMCID: PMC4019507 DOI: 10.1371/journal.pone.0096370] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2014] [Accepted: 04/07/2014] [Indexed: 11/24/2022] Open
Abstract
Acetyl Coenzyme A-dependent N-, O- and N,O-acetylation of aromatic amines and hydrazines by arylamine N-acetyltransferases is well characterised. Here, we describe experiments demonstrating that human arylamine N-acetyltransferase Type 1 and its murine homologue (Type 2) can also catalyse the direct hydrolysis of acetyl Coenzyme A in the presence of folate. This folate-dependent activity is exclusive to these two isoforms; no acetyl Coenzyme A hydrolysis was found when murine arylamine N-acetyltransferase Type 1 or recombinant bacterial arylamine N-acetyltransferases were incubated with folate. Proton nuclear magnetic resonance spectroscopy allowed chemical modifications occurring during the catalytic reaction to be analysed in real time, revealing that the disappearance of acetyl CH3 from acetyl Coenzyme A occurred concomitantly with the appearance of a CH3 peak corresponding to that of free acetate and suggesting that folate is not acetylated during the reaction. We propose that folate is a cofactor for this reaction and suggest it as an endogenous function of this widespread enzyme. Furthermore, in silico docking of folate within the active site of human arylamine N-acetyltransferase Type 1 suggests that folate may bind at the enzyme’s active site, and facilitate acetyl Coenzyme A hydrolysis. The evidence presented in this paper adds to our growing understanding of the endogenous roles of human arylamine N-acetyltransferase Type 1 and its mouse homologue and expands the catalytic repertoire of these enzymes, demonstrating that they are by no means just xenobiotic metabolising enzymes but probably also play an important role in cellular metabolism. These data, together with the characterisation of a naphthoquinone inhibitor of folate-dependent acetyl Coenzyme A hydrolysis by human arylamine N-acetyltransferase Type 1/murine arylamine N-acetyltransferase Type 2, open up a range of future avenues of exploration, both for elucidating the developmental role of these enzymes and for improving chemotherapeutic approaches to pathological conditions including estrogen receptor-positive breast cancer.
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Affiliation(s)
- Nicola Laurieri
- Department of Pharmacology, University of Oxford, Oxford, United Kingdom
- Department of Chemistry, Chemistry Research Laboratory, University of Oxford, Oxford, United Kingdom
| | - Julien Dairou
- Université Paris Diderot, Sorbonne Paris Cité, Unit of Functional and Adaptive Biology, Paris, France
| | - James E. Egleton
- Department of Pharmacology, University of Oxford, Oxford, United Kingdom
- Department of Chemistry, Chemistry Research Laboratory, University of Oxford, Oxford, United Kingdom
| | - Lesley A. Stanley
- Consultant in Investigative Toxicology, Linlithgow, West Lothian, United Kingdom
| | - Angela J. Russell
- Department of Pharmacology, University of Oxford, Oxford, United Kingdom
- Department of Chemistry, Chemistry Research Laboratory, University of Oxford, Oxford, United Kingdom
| | - Jean-Marie Dupret
- Université Paris Diderot, Sorbonne Paris Cité, Unit of Functional and Adaptive Biology, Paris, France
| | - Edith Sim
- Department of Pharmacology, University of Oxford, Oxford, United Kingdom
- Faculty of Science, Engineering and Computing, Kingston University, Kingston on Thames, United Kingdom
- * E-mail: (FR-L); (ES)
| | - Fernando Rodrigues-Lima
- Université Paris Diderot, Sorbonne Paris Cité, Unit of Functional and Adaptive Biology, Paris, France
- * E-mail: (FR-L); (ES)
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18
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Grimm SH, Allmendinger L, Höfner G, Wanner KT. Enantiopurity Determination of the Enantiomers of the Triple Reuptake Inhibitor Indatraline. Chirality 2013; 25:923-33. [DOI: 10.1002/chir.22235] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2013] [Accepted: 07/22/2013] [Indexed: 11/06/2022]
Affiliation(s)
- Stefanie H. Grimm
- Department of Pharmacy - Center of Drug Research; Ludwig-Maximilians-Universität München; Munich Germany
| | - Lars Allmendinger
- Department of Pharmacy - Center of Drug Research; Ludwig-Maximilians-Universität München; Munich Germany
| | - Georg Höfner
- Department of Pharmacy - Center of Drug Research; Ludwig-Maximilians-Universität München; Munich Germany
| | - Klaus T. Wanner
- Department of Pharmacy - Center of Drug Research; Ludwig-Maximilians-Universität München; Munich Germany
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19
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Mahajan S, Singh IP. Determining and reporting purity of organic molecules: why qNMR. MAGNETIC RESONANCE IN CHEMISTRY : MRC 2013; 51:76-81. [PMID: 23233454 DOI: 10.1002/mrc.3906] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/13/2012] [Revised: 11/06/2012] [Accepted: 11/08/2012] [Indexed: 06/01/2023]
Abstract
Although NMR has been routinely used to determine/estimate relative number of protons for structure elucidation, it has been rarely used to determine and report the purity of organic compounds. Through this paper, we want to emphasize on routine use of quantitative NMR (qNMR) for this purpose. The results of qNMR can be routinely considered as documentation of purity much like other established methods (HPLC, elemental analysis and differential scanning calorimetry). qNMR is a fast, easy, accurate and non-destructive alternate to speed up the whole analytical process and serves the purpose of both identification and purity determination of compounds using single technique.
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Affiliation(s)
- Shivani Mahajan
- Department of Natural Products, National Institute of Pharmaceutical Education and Research, SAS Nagar, Punjab, India
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20
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The conjugate addition of enantiomerically pure lithium amides as chiral ammonia equivalents part II: 2005−2011. ACTA ACUST UNITED AC 2012. [DOI: 10.1016/j.tetasy.2012.08.009] [Citation(s) in RCA: 105] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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21
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Hennig A, Borcherding H, Jaeger C, Hatami S, Würth C, Hoffmann A, Hoffmann K, Thiele T, Schedler U, Resch-Genger U. Scope and Limitations of Surface Functional Group Quantification Methods: Exploratory Study with Poly(acrylic acid)-Grafted Micro- and Nanoparticles. J Am Chem Soc 2012; 134:8268-76. [DOI: 10.1021/ja302649g] [Citation(s) in RCA: 74] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Affiliation(s)
- Andreas Hennig
- BAM Federal Institute for Materials Research and Testing, Richard-Willstätter-Strasse
11, D-12489 Berlin, Germany
| | | | - Christian Jaeger
- BAM Federal Institute for Materials Research and Testing, Richard-Willstätter-Strasse
11, D-12489 Berlin, Germany
| | - Soheil Hatami
- BAM Federal Institute for Materials Research and Testing, Richard-Willstätter-Strasse
11, D-12489 Berlin, Germany
| | - Christian Würth
- BAM Federal Institute for Materials Research and Testing, Richard-Willstätter-Strasse
11, D-12489 Berlin, Germany
| | - Angelika Hoffmann
- BAM Federal Institute for Materials Research and Testing, Richard-Willstätter-Strasse
11, D-12489 Berlin, Germany
| | - Katrin Hoffmann
- BAM Federal Institute for Materials Research and Testing, Richard-Willstätter-Strasse
11, D-12489 Berlin, Germany
| | - Thomas Thiele
- PolyAn GmbH, Rudolf-Baschant-Strasse 2,
D-13086 Berlin, Germany
| | - Uwe Schedler
- PolyAn GmbH, Rudolf-Baschant-Strasse 2,
D-13086 Berlin, Germany
| | - Ute Resch-Genger
- BAM Federal Institute for Materials Research and Testing, Richard-Willstätter-Strasse
11, D-12489 Berlin, Germany
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22
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Risi RM, Burke SD. Synthesis of the Prelog-Djerassi lactone via an asymmetric hydroformylation/crotylation tandem sequence. Org Lett 2012; 14:2572-5. [PMID: 22559226 DOI: 10.1021/ol3008765] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A synthesis of the Prelog-Djerassi lactone [(+)-1] has been accomplished in three isolations and 57% overall yield from the known vinyl ortho ester 2. A Rh(I)-catalyzed asymmetric hydroformylation/crotylation tandem sequence has been developed and used to set the C2-C4 stereochemistry. A Rh(I)-catalyzed asymmetric hydrogenation was employed to set the C6 sterechemistry, resulting in an unusually short and efficient enantioselective synthesis of this touchstone molecule from achiral starting material.
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Affiliation(s)
- Roberto M Risi
- Department of Chemistry, University of Wisconsin-Madison , 1101 University Avenue, Madison, Wisconsin 53706-1322, United States
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23
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Pauli GF, Gödecke T, Jaki BU, Lankin DC. Quantitative 1H NMR. Development and potential of an analytical method: an update. JOURNAL OF NATURAL PRODUCTS 2012; 75:834-51. [PMID: 22482996 PMCID: PMC3384681 DOI: 10.1021/np200993k] [Citation(s) in RCA: 237] [Impact Index Per Article: 19.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/19/2023]
Abstract
Covering the literature from mid-2004 until the end of 2011, this review continues a previous literature overview on quantitative (1)H NMR (qHNMR) methodology and its applications in the analysis of natural products. Among the foremost advantages of qHNMR is its accurate function with external calibration, the lack of any requirement for identical reference materials, a high precision and accuracy when properly validated, and an ability to quantitate multiple analytes simultaneously. As a result of the inclusion of over 170 new references, this updated review summarizes a wealth of detailed experiential evidence and newly developed methodology that supports qHNMR as a valuable and unbiased analytical tool for natural product and other areas of research.
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Affiliation(s)
- Guido F Pauli
- Department of Medicinal Chemistry and Pharmacognosy, College of Pharmacy, University of Illinois at Chicago, Chicago, Illinois 60612, USA.
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24
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Prabhu UR, Chaudhari SR, Suryaprakash N. Visualization of enantiomers and determination of homo- and hetero-nuclear residual dipolar and scalar couplings: The natural abundant 13C edited J/D-resolved NMR techniques. Chem Phys Lett 2010. [DOI: 10.1016/j.cplett.2010.10.019] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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25
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Claridge TDW, Davies SG, Lee JA, Nicholson RL, Roberts PM, Russell AJ, Smith AD, Toms SM. Highly (E)-selective Wadsworth-Emmons reactions promoted by methylmagnesium bromide. Org Lett 2010; 10:5437-40. [PMID: 18975957 DOI: 10.1021/ol802212e] [Citation(s) in RCA: 54] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
An experimentally simple protocol for the very highly (E)-selective Wadsworth-Emmons reaction [(E):(Z) selectivities in excess of 180:1 in some cases] of a range of straight-chain and branched aliphatic, substituted aromatic, and base-sensitive aldehydes via reaction with an alkyl diethylphosphonoacetate and MeMgBr is reported.
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Affiliation(s)
- Timothy D W Claridge
- Department of Chemistry, Chemistry Research Laboratory, University of Oxford, Mansfield Road, Oxford OX1 3TA, UK
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26
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Pilgrim W, Murphy PV. SnCl4- and TiCl4-Catalyzed Anomerization of Acylated O- and S-Glycosides: Analysis of Factors That Lead to Higher α:β Anomer Ratios and Reaction Rates. J Org Chem 2010; 75:6747-55. [DOI: 10.1021/jo101090f] [Citation(s) in RCA: 75] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Wayne Pilgrim
- School of Chemistry, National University of Ireland, Galway, Ireland
- Centre for Synthesis and Chemical Biology, School of Chemistry and Chemical Biology, University College Dublin, Belfield, Dublin 4, Ireland
| | - Paul V. Murphy
- School of Chemistry, National University of Ireland, Galway, Ireland
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27
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Paz J, Pérez-Balado C, Iglesias B, Muñoz L. Carbon dioxide as a carbonylating agent in the synthesis of 2-oxazolidinones, 2-oxazinones, and cyclic ureas: scope and limitations. J Org Chem 2010; 75:3037-46. [PMID: 20387844 DOI: 10.1021/jo100268n] [Citation(s) in RCA: 73] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Carbon dioxide can be used as a convenient carbonylating agent in the synthesis of 2-oxazolidinones, 2-oxazinones, and cyclic ureas. The transient carbamate anion generated by treating a primary or secondary amine group in basic media can be activated with phosphorylating agents such as Diphenylphosphoryl azide (DPPA) and Diphenyl chlorophosphate (DPPCl) but also with other types of electrophiles such as SOCl(2), TsCl, or AcCl. The intramolecular trapping of the activated carbamate by a hydroxyl group leads to the formation of 2-oxazolidinones or 2-oxazinones in good to excellent yields. This methodology was successfully applied to the synthesis of cyclic ureas up to 7-membered rings from the corresponding diamines.
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Affiliation(s)
- Jairo Paz
- Departamento de Química Orgánica, Facultade de Química, Universidade de Vigo Campus Universitario, 36310 Vigo, Spain
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29
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Guizzetti S, Benaglia M, Rossi S. Highly stereoselective metal-free catalytic reduction of imines: an easy entry to enantiomerically pure amines and natural and unnatural alpha-amino esters. Org Lett 2009; 11:2928-31. [PMID: 19480447 DOI: 10.1021/ol900945h] [Citation(s) in RCA: 73] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A highly efficient catalytic stereoselective ketimine reduction is described. The combination of an inexpensive chiral organocatalyst, easily prepared in a single step, and of a very cheap removable chiral auxiliary allowed us to obtain enantiomerically pure amino compounds. The methodology allowed synthesis of chiral secondary and primary amines and natural and unnatural amino esters in high yields often with total control of the absolute stereochemistry.
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Affiliation(s)
- Stefania Guizzetti
- Dipartimento di Chimica Organica e Industriale, Università degli Studi di Milano, Via Golgi 19, I-20133 Milano, Italy
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30
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Dalisay DS, Molinski TF. NMR quantitation of natural products at the nanomole scale. JOURNAL OF NATURAL PRODUCTS 2009; 72:739-44. [PMID: 19399996 PMCID: PMC2753506 DOI: 10.1021/np900009b] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
We describe a simple and accurate method for quantitation by solvent 13C-satellites (QSCS) of very small amounts of natural products using microprobe NMR spectroscopy. The method takes advantage of integration of 13C satellite peaks of deuterated solvents, in particular CDCl3, that have favorable intensities for measurements of samples in NMR microcoils and microprobe tubes in the 1-200 nanomole range.
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Affiliation(s)
- Doralyn S. Dalisay
- Department of Chemistry and Biochemistry, University of California, San Diego, 9500 Gilman Drive, La Jolla, California 92093-0358
| | - Tadeusz F. Molinski
- Department of Chemistry and Biochemistry, University of California, San Diego, 9500 Gilman Drive, La Jolla, California 92093-0358
- Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California, San Diego, 9500 Gilman Drive, La Jolla, California 92093-0358
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31
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Davies SG, Durbin MJ, Goddard EC, Kelly PM, Kurosawa W, Lee JA, Nicholson RL, Price PD, Roberts PM, Russell AJ, Scott PM, Smith AD. Doubly diastereoselective conjugate addition of homochiral lithium amides to homochiral α,β-unsaturated esters containing cis- and trans-dioxolane units. Org Biomol Chem 2009; 7:761-76. [DOI: 10.1039/b818298a] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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