1
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Jiang LF, Wu SH, Jiang YX, Ma HX, He JJ, Bi YB, Kong DY, Cheng YF, Cheng X, Deng QH. Enantioselective copper-catalyzed azidation/click cascade reaction for access to chiral 1,2,3-triazoles. Nat Commun 2024; 15:4919. [PMID: 38858346 PMCID: PMC11164697 DOI: 10.1038/s41467-024-49313-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/29/2024] [Accepted: 06/03/2024] [Indexed: 06/12/2024] Open
Abstract
Chiral 1,2,3-triazoles are highly attractive motifs in various fields. However, achieving catalytic asymmetric click reactions of azides and alkynes for chiral triazole synthesis remains a significant challenge, mainly due to the limited catalytic systems and substrate scope. Herein, we report an enantioselective azidation/click cascade reaction of N-propargyl-β-ketoamides with a readily available and potent azido transfer reagent via copper catalysis, which affords a variety of chiral 1,2,3-triazoles with up to 99% yield and 95% ee under mild conditions. Notably, chiral 1,5-disubstituted triazoles that have not been accessed by previous asymmetric click reactions are also prepared with good functional group tolerance.
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Affiliation(s)
- Ling-Feng Jiang
- The Education Ministry Key Laboratory of Resource Chemistry, Joint International Research Laboratory of Resource Chemistry of Ministry of Education, Shanghai Key Laboratory of Rare Earth Functional Materials, and Shanghai Frontiers Science Center of Biomimetic Catalysis, Shanghai Normal University, 200234, Shanghai, China
| | - Shao-Hua Wu
- The Education Ministry Key Laboratory of Resource Chemistry, Joint International Research Laboratory of Resource Chemistry of Ministry of Education, Shanghai Key Laboratory of Rare Earth Functional Materials, and Shanghai Frontiers Science Center of Biomimetic Catalysis, Shanghai Normal University, 200234, Shanghai, China
| | - Yu-Xuan Jiang
- The Education Ministry Key Laboratory of Resource Chemistry, Joint International Research Laboratory of Resource Chemistry of Ministry of Education, Shanghai Key Laboratory of Rare Earth Functional Materials, and Shanghai Frontiers Science Center of Biomimetic Catalysis, Shanghai Normal University, 200234, Shanghai, China
| | - Hong-Xiang Ma
- The Education Ministry Key Laboratory of Resource Chemistry, Joint International Research Laboratory of Resource Chemistry of Ministry of Education, Shanghai Key Laboratory of Rare Earth Functional Materials, and Shanghai Frontiers Science Center of Biomimetic Catalysis, Shanghai Normal University, 200234, Shanghai, China
| | - Jia-Jun He
- The Education Ministry Key Laboratory of Resource Chemistry, Joint International Research Laboratory of Resource Chemistry of Ministry of Education, Shanghai Key Laboratory of Rare Earth Functional Materials, and Shanghai Frontiers Science Center of Biomimetic Catalysis, Shanghai Normal University, 200234, Shanghai, China
| | - Yang-Bo Bi
- The Education Ministry Key Laboratory of Resource Chemistry, Joint International Research Laboratory of Resource Chemistry of Ministry of Education, Shanghai Key Laboratory of Rare Earth Functional Materials, and Shanghai Frontiers Science Center of Biomimetic Catalysis, Shanghai Normal University, 200234, Shanghai, China
| | - De-Yi Kong
- The Education Ministry Key Laboratory of Resource Chemistry, Joint International Research Laboratory of Resource Chemistry of Ministry of Education, Shanghai Key Laboratory of Rare Earth Functional Materials, and Shanghai Frontiers Science Center of Biomimetic Catalysis, Shanghai Normal University, 200234, Shanghai, China
| | - Yi-Fei Cheng
- The Education Ministry Key Laboratory of Resource Chemistry, Joint International Research Laboratory of Resource Chemistry of Ministry of Education, Shanghai Key Laboratory of Rare Earth Functional Materials, and Shanghai Frontiers Science Center of Biomimetic Catalysis, Shanghai Normal University, 200234, Shanghai, China
| | - Xuan Cheng
- The Education Ministry Key Laboratory of Resource Chemistry, Joint International Research Laboratory of Resource Chemistry of Ministry of Education, Shanghai Key Laboratory of Rare Earth Functional Materials, and Shanghai Frontiers Science Center of Biomimetic Catalysis, Shanghai Normal University, 200234, Shanghai, China
| | - Qing-Hai Deng
- The Education Ministry Key Laboratory of Resource Chemistry, Joint International Research Laboratory of Resource Chemistry of Ministry of Education, Shanghai Key Laboratory of Rare Earth Functional Materials, and Shanghai Frontiers Science Center of Biomimetic Catalysis, Shanghai Normal University, 200234, Shanghai, China.
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2
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Groleau R, Chapman RSL, Lowe JP, Lyall CL, Kociok-Köhn G, James TD, Bull SD. BINOL as a Chiral Solvating Agent for Sulfiniminoboronic Acids. Anal Chem 2023; 95:16801-16809. [PMID: 37931004 PMCID: PMC10666087 DOI: 10.1021/acs.analchem.3c01613] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2023] [Accepted: 09/25/2023] [Indexed: 11/08/2023]
Abstract
1H NMR spectroscopic studies using BINOL as a chiral solvating agent (CSA) for a scalemic sulfiniminoboronic acid (SIBA) have revealed concentration- and enantiopurity-dependent variations in the chemical shifts of diagnostic imine protons used to determine enantiopurity levels. 11B/15N NMR spectroscopic studies and X-ray structural investigations revealed that unlike other iminoboronate species, BINOL-SIBA assemblies do not contain N-B coordination bonds, with 1H NMR NOESY experiments indicating that intermolecular H-bonding networks between BINOL and the SIBA analyte are responsible for these variations. These effects can lead to diastereomeric signal overlap at certain er values that could potentially lead to enantiopurity/configuration misassignments. Consequently, it is recommended that hydrogen-bonding-CSA-based 1H NMR protocols should be repeated using both CSA enantiomers to ensure that any concentration- and/or er-dependent variations in diagnostic chemical shifts are accounted for when determining the enantiopurity of a scalemic analyte.
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Affiliation(s)
- Robin
R. Groleau
- Department
of Chemistry, University of Bath, Claverton Down, Bath BA2 7AY, U.K.
| | | | - John P. Lowe
- Department
of Chemistry, University of Bath, Claverton Down, Bath BA2 7AY, U.K.
| | - Catherine L. Lyall
- Department
of Chemistry, University of Bath, Claverton Down, Bath BA2 7AY, U.K.
| | | | - Tony D. James
- Department
of Chemistry, University of Bath, Claverton Down, Bath BA2 7AY, U.K.
- School
of Chemistry and Chemical Engineering, Henan
Normal University, Xianxiang 453007, China
| | - Steven D. Bull
- Department
of Chemistry, University of Bath, Claverton Down, Bath BA2 7AY, U.K.
- School
of Chemistry, University of Leicester, Leicester LE1 7RH, U.K.
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3
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Guo WT, Zhu BH, Chen Y, Yang J, Qian PC, Deng C, Ye LW, Li L. Enantioselective Rh-Catalyzed Azide-Internal-Alkyne Cycloaddition for the Construction of Axially Chiral 1,2,3-Triazoles. J Am Chem Soc 2022; 144:6981-6991. [PMID: 35394289 DOI: 10.1021/jacs.2c01985] [Citation(s) in RCA: 19] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Significant advances have been achieved for the construction of chiral skeletons containing 1,2,3-triazoles via transition-metal-catalyzed asymmetric azide-alkyne cycloaddition; however, most of them have been limited to terminal alkynes in the synthesis of central chirality via desymmetrization and dynamic/dynamic kinetic resolution. Enantioselective transition-metal-catalyzed azide-internal-alkyne cycloaddition is extremely limited. Moreover, the construction of a challenging five-membered (hetero)biaryl axially chiral molecule via transition-metal-catalyzed asymmetric azide-internal-alkyne cycloaddition is still underexplored. Herein, we first report an atroposelective and atom-economical synthesis of axially chiral 1,4,5-trisubstituted 1,2,3-triazoles, directly acting as core chiral units of challenging five-membered atropisomers, via the enantioselective Rh-catalyzed azide-alkyne cycloaddition (E-RhAAC) of internal alkynes and azides. The reaction demonstrates excellent functional group tolerance, forging a variety of C-C axially chiral 1,2,3-triazoles under mild conditions with moderate to excellent yields (up to 99% yield) and generally high to excellent enantioselectivities (up to 99% ee) along with specific regiocontrol. The origin of regio- and enantioselectivity control is disclosed by density functional theory (DFT) calculations, providing new guidance for the facile construction of axially chiral compounds.
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Affiliation(s)
- Wen-Ting Guo
- College of Chemistry & Materials Engineering, Wenzhou University, Wenzhou 325035, China
| | - Bo-Han Zhu
- College of Chemistry & Materials Engineering, Wenzhou University, Wenzhou 325035, China
| | - Yi Chen
- College of Chemistry & Materials Engineering, Wenzhou University, Wenzhou 325035, China
| | - Jian Yang
- College of Chemistry & Materials Engineering, Wenzhou University, Wenzhou 325035, China
| | - Peng-Cheng Qian
- College of Chemistry & Materials Engineering, Wenzhou University, Wenzhou 325035, China
| | - Chao Deng
- Jiangsu Key Laboratory of Pesticide Science and Department of Chemistry, College of Sciences, Nanjing Agricultural University, Nanjing 210095, China
| | - Long-Wu Ye
- State Key Laboratory of Physical Chemistry of Solid Surfaces and College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China
| | - Long Li
- College of Chemistry & Materials Engineering, Wenzhou University, Wenzhou 325035, China.,State Key Laboratory of Physical Chemistry of Solid Surfaces and College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China
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4
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Valenzuela SA, Crory HSN, Yao C, Howard JR, Saucedo G, Silva AP, Anslyn EV. A Colorimetric Method for Quantifying
Cis
and
Trans
Alkenes Using an Indicator Displacement Assay. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202101004] [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)
- Stephanie A. Valenzuela
- Department of Chemistry University of Texas at Austin 100 E 24th Street, Norman Hackerman Building Room 114A Austin TX 78712 USA
| | - Hannah S. N. Crory
- School of Chemistry and Chemical Engineering Queen's University Belfast Stranmillis Road Belfast BT9 5AG UK
| | - Chao‐Yi Yao
- School of Chemistry and Chemical Engineering Queen's University Belfast Stranmillis Road Belfast BT9 5AG UK
| | - James R. Howard
- Department of Chemistry University of Texas at Austin 100 E 24th Street, Norman Hackerman Building Room 114A Austin TX 78712 USA
| | - Gabriel Saucedo
- Department of Chemistry University of Texas at Austin 100 E 24th Street, Norman Hackerman Building Room 114A Austin TX 78712 USA
| | - A. Prasanna Silva
- School of Chemistry and Chemical Engineering Queen's University Belfast Stranmillis Road Belfast BT9 5AG UK
| | - Eric V. Anslyn
- Department of Chemistry University of Texas at Austin 100 E 24th Street, Norman Hackerman Building Room 114A Austin TX 78712 USA
- School of Chemistry and Chemical Engineering Queen's University Belfast Stranmillis Road Belfast BT9 5AG UK
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5
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Valenzuela SA, Crory HSN, Yao CY, Howard JR, Saucedo G, de Silva AP, Anslyn EV. A Colorimetric Method for Quantifying Cis and Trans Alkenes Using an Indicator Displacement Assay. Angew Chem Int Ed Engl 2021; 60:13819-13823. [PMID: 33723888 DOI: 10.1002/anie.202101004] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2021] [Revised: 03/12/2021] [Indexed: 11/10/2022]
Abstract
A colorimetric indicator displacement assay (IDA) amenable to high-throughput experimentation was developed to determine the percentage of cis and trans alkenes. Using 96-well plates two steps are performed: a reaction plate for dihydroxylation of the alkenes followed by an IDA screening plate consisting of an indicator and a boronic acid. The dihydroxylation generates either erythro or threo vicinal diols from cis or trans alkenes, depending upon their syn- or anti-addition mechanisms. Threo diols preferentially associate with the boronic acid due to the creation of more stable boronate esters, thus displacing the indicator to a greater extent. The generality of the protocol was demonstrated using seven sets of cis and trans alkenes. Blind mixtures of cis and trans alkenes were made, resulting in an average error of ±2 % in the percentage of cis or trans alkenes, and implementing E2 and Wittig reactions gave errors of ±3 %. Furthermore, we developed variants of the IDA for which the color may be tuned to optimize the response for the human eye.
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Affiliation(s)
- Stephanie A Valenzuela
- Department of Chemistry, University of Texas at Austin, 100 E 24th Street, Norman Hackerman Building Room 114A, Austin, TX, 78712, USA
| | - Hannah S N Crory
- School of Chemistry and Chemical Engineering, Queen's University Belfast, Stranmillis Road, Belfast, BT9 5AG, UK
| | - Chao-Yi Yao
- School of Chemistry and Chemical Engineering, Queen's University Belfast, Stranmillis Road, Belfast, BT9 5AG, UK
| | - James R Howard
- Department of Chemistry, University of Texas at Austin, 100 E 24th Street, Norman Hackerman Building Room 114A, Austin, TX, 78712, USA
| | - Gabriel Saucedo
- Department of Chemistry, University of Texas at Austin, 100 E 24th Street, Norman Hackerman Building Room 114A, Austin, TX, 78712, USA
| | - A Prasanna de Silva
- School of Chemistry and Chemical Engineering, Queen's University Belfast, Stranmillis Road, Belfast, BT9 5AG, UK
| | - Eric V Anslyn
- Department of Chemistry, University of Texas at Austin, 100 E 24th Street, Norman Hackerman Building Room 114A, Austin, TX, 78712, USA.,School of Chemistry and Chemical Engineering, Queen's University Belfast, Stranmillis Road, Belfast, BT9 5AG, UK
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6
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Groleau RR, James TD, Bull SD. The Bull-James assembly: Efficient iminoboronate complex formation for chiral derivatization and supramolecular assembly. Coord Chem Rev 2021. [DOI: 10.1016/j.ccr.2020.213599] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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7
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Shcherbakova EG, James TD, Anzenbacher P. High-throughput assay for determining enantiomeric excess of chiral diols, amino alcohols, and amines and for direct asymmetric reaction screening. Nat Protoc 2020; 15:2203-2229. [DOI: 10.1038/s41596-020-0329-1] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2017] [Accepted: 04/14/2020] [Indexed: 11/09/2022]
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8
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Hiller NDJ, do Amaral e Silva NA, Tavares TA, Faria RX, Eberlin MN, de Luna Martins D. Arylboronic Acids and their Myriad of Applications Beyond Organic Synthesis. European J Org Chem 2020. [DOI: 10.1002/ejoc.202000396] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Affiliation(s)
- Noemi de Jesus Hiller
- Instituto de Química; Laboratório de Catálise e Síntese (Lab CSI); Laboratório 413; Universidade Federal Fluminense; Outeiro de São João Batista s/n; Campus do Valonguinho, Centro Niterói RJ 24020-141 Brasil
| | - Nayane Abreu do Amaral e Silva
- Instituto de Química; Laboratório de Catálise e Síntese (Lab CSI); Laboratório 413; Universidade Federal Fluminense; Outeiro de São João Batista s/n; Campus do Valonguinho, Centro Niterói RJ 24020-141 Brasil
| | - Thais Apolinário Tavares
- Instituto de Química; Laboratório de Catálise e Síntese (Lab CSI); Laboratório 413; Universidade Federal Fluminense; Outeiro de São João Batista s/n; Campus do Valonguinho, Centro Niterói RJ 24020-141 Brasil
| | - Robson Xavier Faria
- Laboratório de Toxoplasmose e outras Protozooses; Instituto Oswaldo Cruz, Fiocruz; Av. Brasil, 4365 Manguinhos Rio de Janeiro RJ 21040-360 Brasil
| | - Marcos Nogueira Eberlin
- Mackenzie Presbyterian University; School of Engineering; Rua da Consolação, 930 SP 01302-907 São Paulo Brasil
| | - Daniela de Luna Martins
- Instituto de Química; Laboratório de Catálise e Síntese (Lab CSI); Laboratório 413; Universidade Federal Fluminense; Outeiro de São João Batista s/n; Campus do Valonguinho, Centro Niterói RJ 24020-141 Brasil
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9
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Wang C, Zhu RY, Liao K, Zhou F, Zhou J. Enantioselective Cu(I)-Catalyzed Cycloaddition of Prochiral Diazides with Terminal or 1-Iodoalkynes. Org Lett 2020; 22:1270-1274. [PMID: 31999130 DOI: 10.1021/acs.orglett.9b04522] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
We report an unprecedented highly enantioselective desymmetric Cu(I)-catalyzed 1,3-dipolar cycloaddition of diazides with terminal alkynes and 1-iodoalkynes, affording tertiary alcohols bearing a 1,2,3-triazole moiety in high yield and excellent ee value. PYBOX ligands with a C4 shielding group once again show the promising ability to achieve higher enantioselectivity.
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Affiliation(s)
| | | | | | | | - Jian Zhou
- State Key Laboratory of Organometallic Chemistry , Shanghai Institute of Organic Chemistry , Shanghai 200032 , China
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10
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Brittain WDG, Dalling AG, Sun Z, Duff CSL, Male L, Buckley BR, Fossey JS. Coetaneous catalytic kinetic resolution of alkynes and azides through asymmetric triazole formation. Sci Rep 2019; 9:15086. [PMID: 31636274 PMCID: PMC6803658 DOI: 10.1038/s41598-019-50940-4] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2019] [Accepted: 09/18/2019] [Indexed: 12/20/2022] Open
Abstract
A non-enzymatic simultaneous (coined coetaneous) kinetic resolution of a racemic alkyne and racemic azide, utilising an asymmetric CuAAC reaction is reported. The use of a CuCl (R,R)-Ph-Pybox catalyst system effects a simultaneous kinetic resolution of two racemic starting materials to give one major triazolic diastereoisomer in the ratio 74:12:4:10 (dr 84:16, 90% ee maj). The corresponding control reaction using an achiral copper catalyst gives the four possible diastereoisomers in a 23:27:23:27 ratio, demonstrating minimal inherent substrate control.
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Affiliation(s)
- William D G Brittain
- School of Chemistry, University of Birmingham, Edgbaston, Birmingham, West Midlands, B15 2TT, UK
| | - Andrew G Dalling
- School of Chemistry, University of Birmingham, Edgbaston, Birmingham, West Midlands, B15 2TT, UK
| | - Zhenquan Sun
- School of Chemistry, University of Birmingham, Edgbaston, Birmingham, West Midlands, B15 2TT, UK
- School of Chemistry and Chemical Engineering, Sun Yat-Sen University, 135 Xingang Rd. W., Guangzhou, 510275, China
| | - Cécile S Le Duff
- NMR Facility, School of Chemistry, University of Birmingham, Edgbaston, Birmingham, B15 2TT, West Midlands, UK
| | - Louise Male
- X-Ray Crystallography Facility, School of Chemistry, University of Birmingham, Edgbaston, Birmingham, West Midlands, B15 2TT, UK
| | - Benjamin R Buckley
- Department of Chemistry, Loughborough University, Loughborough, Leicestershire, LE11 3TU, UK.
| | - John S Fossey
- School of Chemistry, University of Birmingham, Edgbaston, Birmingham, West Midlands, B15 2TT, UK.
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11
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Alexander JR, Ott AA, Liu EC, Topczewski JJ. Kinetic Resolution of Cyclic Secondary Azides, Using an Enantioselective Copper-Catalyzed Azide-Alkyne Cycloaddition. Org Lett 2019; 21:4355-4358. [PMID: 31117717 DOI: 10.1021/acs.orglett.9b01556] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
An enantioselective copper-catalyzed azide-alkyne cycloaddition (E-CuAAC) is reported by kinetic resolution. Chiral triazoles were isolated in high yield with limiting alkyne (up to 97:3 enantiomeric ratio (er)). A range of substrates were tolerated (>30 examples), and the reaction was scaled to >1 g. The er of a triazole product could be enhanced by recrystallization and the recovered scalemic azide could be racemized and recycled. Recycling the azide allows efficient use of the undesired azide enantiomer.
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Affiliation(s)
- Juliana R Alexander
- Department of Chemistry , University of Minnesota Twin Cities , Minneapolis , Minnesota 55455 , United States
| | - Amy A Ott
- Department of Chemistry , University of Minnesota Twin Cities , Minneapolis , Minnesota 55455 , United States
| | - En-Chih Liu
- Department of Chemistry , University of Minnesota Twin Cities , Minneapolis , Minnesota 55455 , United States
| | - Joseph J Topczewski
- Department of Chemistry , University of Minnesota Twin Cities , Minneapolis , Minnesota 55455 , United States
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12
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Brittain WDG, Cobb SL. Tetrafluoropyridyl (TFP): a general phenol protecting group readily cleaved under mild conditions. Org Biomol Chem 2019; 17:2110-2115. [PMID: 30623945 PMCID: PMC6390695 DOI: 10.1039/c8ob02899k] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Herein we introduce tetrafluoropyridyl (TFP) as a new general protecting group for phenols. The TFP protecting group is readily cleaved under mild conditions.
Phenols are extremely valuable building blocks in the areas of pharmaceuticals, natural products, materials and catalysts. In order to carry out modifications on phenols, the phenolic oxygen is routinely protected to prevent unwanted side reactions. Presently many of the protecting groups available can require harsh conditions, specialist equipment, expensive or air/moisture-sensitive reagents to install and remove. Here we introduce the use of the tetrafluoropyridyl (TFP) group as a general protecting group for phenols. TFP can be installed in one step with no sensitivity to water or air, and it is stable under a range of commonly employed reaction conditions including acid and base. The TFP protecting group is readily cleaved under mild conditions with quantitative conversion to the parent phenol, observed in many cases in less than 1 hour.
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13
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Su HY, Gorelik D, Taylor MS. Chiral phosphine ligand libraries based on the Bull–James three-component supramolecular assembly. Supramol Chem 2019. [DOI: 10.1080/10610278.2018.1564829] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Affiliation(s)
- Hsin Y. Su
- Department of Chemistry, University of Toronto, Toronto, Canada
| | - Daniel Gorelik
- Department of Chemistry, University of Toronto, Toronto, Canada
| | - Mark S. Taylor
- Department of Chemistry, University of Toronto, Toronto, Canada
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14
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Zhao Y, van Nguyen H, Male L, Craven P, Buckley BR, Fossey JS. Phosphino-Triazole Ligands for Palladium-Catalyzed Cross-Coupling. Organometallics 2018; 37:4224-4241. [PMID: 30524158 PMCID: PMC6265957 DOI: 10.1021/acs.organomet.8b00539] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2018] [Indexed: 11/29/2022]
Abstract
Twelve 1,5-disubtituted and fourteen 5-substituted 1,2,3-triazole derivatives bearing diaryl or dialkyl phosphines at the 5-position were synthesized and used as ligands for palladium-catalyzed Suzuki-Miyaura cross-coupling reactions. Bulky substrates were tested, and lead-like product formation was demonstrated. The online tool SambVca2.0 was used to assess steric parameters of ligands and preliminary buried volume determination using XRD-obtained data in a small number of cases proved to be informative. Two modeling approaches were compared for the determination of the buried volume of ligands where XRD data was not available. An approach with imposed steric restrictions was found to be superior in leading to buried volume determinations that closely correlate with observed reaction conversions. The online tool LLAMA was used to determine lead-likeness of potential Suzuki-Miyaura cross-coupling products, from which 10 of the most lead-like were successfully synthesized. Thus, confirming these readily accessible triazole-containing phosphines as highly suitable ligands for reaction screening and optimization in drug discovery campaigns.
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Affiliation(s)
- Yiming Zhao
- School of Chemistry and X-ray Crystallography Facility, School of Chemistry, University of Birmingham, Edgbaston, Birmingham, West Midlands B15 2TT, United Kingdom
| | - Huy van Nguyen
- School of Chemistry and X-ray Crystallography Facility, School of Chemistry, University of Birmingham, Edgbaston, Birmingham, West Midlands B15 2TT, United Kingdom
| | - Louise Male
- School of Chemistry and X-ray Crystallography Facility, School of Chemistry, University of Birmingham, Edgbaston, Birmingham, West Midlands B15 2TT, United Kingdom
| | - Philip Craven
- School of Chemistry and X-ray Crystallography Facility, School of Chemistry, University of Birmingham, Edgbaston, Birmingham, West Midlands B15 2TT, United Kingdom
| | - Benjamin R Buckley
- Department of Chemistry, Loughborough University, Loughborough, Leicestershire LE11 3TU, United Kingdom
| | - John S Fossey
- School of Chemistry and X-ray Crystallography Facility, School of Chemistry, University of Birmingham, Edgbaston, Birmingham, West Midlands B15 2TT, United Kingdom
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15
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Yoshizawa A, Feula A, Male L, Leach AG, Fossey JS. Rigid and concave, 2,4-cis-substituted azetidine derivatives: A platform for asymmetric catalysis. Sci Rep 2018; 8:6541. [PMID: 29695806 PMCID: PMC5916886 DOI: 10.1038/s41598-018-24784-3] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2018] [Accepted: 03/26/2018] [Indexed: 11/25/2022] Open
Abstract
A series of single enantiomer, 2,4-cis-disubstituted amino azetidines were synthesised and used as ligands for copper-catalysed Henry reactions of aldehydes with nitromethane. Optimisation of ligand substituents and the reaction conditions was conducted. The enantiomeric excess of the formed products was highest when alkyl aldehydes were employed in the reaction (>99% e.e.). The absolute stereochemistry of one representative azetidine derivative salt was determined by analysis of the Flack parameter of an XRD single crystal structure. The origin of selectivity in catalysis was investigated computationally, revealing the importance of the amino-substituent in determining the stereochemical outcome. A racemic platinum complex of a cis-disubstituted azetidine is examined by XRD single crystal structure analysis with reference to its steric parameters, and analogies to the computationally determined copper complex catalyst are drawn. A preliminary example of the use of a cis-disubstituted azetidine scaffold in thiourea H-bonding catalyst is noted in the supporting information.
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Affiliation(s)
- Akina Yoshizawa
- School of Chemistry, University of Birmingham, Edgbaston, Birmingham, West Midlands, B15 2TT, UK
| | - Antonio Feula
- School of Chemistry, University of Birmingham, Edgbaston, Birmingham, West Midlands, B15 2TT, UK
| | - Louise Male
- X-Ray Crystallography Facility, School of Chemistry, University of Birmingham, Edgbaston, Birmingham, West Midlands, B15 2TT, UK
| | - Andrew G Leach
- School of Pharmacy and Biomolecular Sciences, Liverpool John Moores University, Byrom Street, Liverpool, L3 3AF, UK.
| | - John S Fossey
- School of Chemistry, University of Birmingham, Edgbaston, Birmingham, West Midlands, B15 2TT, UK.
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