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Lai Z, Zhang R, Feng Q, Sun J. 3-Aminooxetanes: versatile 1,3-amphoteric molecules for intermolecular annulation reactions. Chem Sci 2020; 11:9945-9949. [PMID: 34094256 PMCID: PMC8162131 DOI: 10.1039/d0sc04254d] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
Despite the versatility of amphoteric molecules, stable and easily accessible ones are still limitedly known. As a result, the discovery of new amphoteric reactivity remains highly desirable. Herein we introduce 3-aminooxetanes as a new family of stable and readily available 1,3-amphoteric molecules and systematically demonstrated their amphoteric reactivity toward polarized π-systems in a diverse range of intermolecular [3 + 2] annulations. These reactions not only enrich the reactivity of oxetanes, but also provide convergent access to valuable heterocycles. Despite the versatility of amphoteric molecules, stable and easily accessible ones are still limitedly known.![]()
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Affiliation(s)
- Zengwei Lai
- Department of Chemistry, Shenzhen Research Institute, The Hong Kong University of Science and Technology Clear Water Bay Hong Kong SAR Kowloon China .,State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences 555 Zuchongzhi Road Shanghai 201203 China
| | - Renwei Zhang
- Department of Chemistry, Shenzhen Research Institute, The Hong Kong University of Science and Technology Clear Water Bay Hong Kong SAR Kowloon China
| | - Qiang Feng
- Department of Chemistry, Shenzhen Research Institute, The Hong Kong University of Science and Technology Clear Water Bay Hong Kong SAR Kowloon China
| | - Jianwei Sun
- Department of Chemistry, Shenzhen Research Institute, The Hong Kong University of Science and Technology Clear Water Bay Hong Kong SAR Kowloon China
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2
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Affiliation(s)
- Luuk Mestrom
- Biokatalyse; Afdeling Biotechnologie; Technische Universiteit Delft; Van der Maasweg 9 2629HZ Delft The Netherlands
| | - Paula Bracco
- Biokatalyse; Afdeling Biotechnologie; Technische Universiteit Delft; Van der Maasweg 9 2629HZ Delft The Netherlands
| | - Ulf Hanefeld
- Biokatalyse; Afdeling Biotechnologie; Technische Universiteit Delft; Van der Maasweg 9 2629HZ Delft The Netherlands
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3
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St. Denis JD, Liew SK, Scully CCG, Yudin AK. Activation of Alkynylzinc Reagents by a Hemiaminal-Driven Catalytic Microenvironment. European J Org Chem 2017. [DOI: 10.1002/ejoc.201601554] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Jeffrey D. St. Denis
- Department of Chemistry; University of Toronto; 80 St. George Street M5S 3H6 Toronto, Ontario Canada
| | - Sean K. Liew
- Department of Chemistry; University of Toronto; 80 St. George Street M5S 3H6 Toronto, Ontario Canada
| | - Conor C. G. Scully
- Department of Chemistry; University of Toronto; 80 St. George Street M5S 3H6 Toronto, Ontario Canada
| | - Andrei K. Yudin
- Department of Chemistry; University of Toronto; 80 St. George Street M5S 3H6 Toronto, Ontario Canada
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4
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Legnani L, Morandi B. Direct Catalytic Synthesis of Unprotected 2-Amino-1-Phenylethanols from Alkenes by Using Iron(II) Phthalocyanine. Angew Chem Int Ed Engl 2016; 55:2248-51. [PMID: 26836348 DOI: 10.1002/anie.201507630] [Citation(s) in RCA: 105] [Impact Index Per Article: 13.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2015] [Revised: 10/19/2015] [Indexed: 12/31/2022]
Abstract
Aryl-substituted amino alcohols are privileged scaffolds in medicinal chemistry and natural products. Herein, we report that an exceptionally simple and inexpensive Fe(II) complex efficiently catalyzes the direct transformation of simple alkenes into unprotected amino alcohols in good yield and perfect regioselectivity. This new catalytic method was applied in the expedient synthesis of bioactive molecules and could be extended to aminoetherification.
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Affiliation(s)
- Luca Legnani
- Max-Planck-Institut für Kohlenforschung, Kaiser-Wilhelm-Platz 1, 45470, Mülheim an der Ruhr, Germany
| | - Bill Morandi
- Max-Planck-Institut für Kohlenforschung, Kaiser-Wilhelm-Platz 1, 45470, Mülheim an der Ruhr, Germany.
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5
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Legnani L, Morandi B. Direkte katalytische Synthese von ungeschützten 2-Amino-1-phenylethanolen aus Alkenen mithilfe von Eisen(II)-phthalocyanin. Angew Chem Int Ed Engl 2016. [DOI: 10.1002/ange.201507630] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Luca Legnani
- Max-Planck-Institut für Kohlenforschung; Kaiser-Wilhelm-Platz 1 45470 Mülheim an der Ruhr Deutschland
| | - Bill Morandi
- Max-Planck-Institut für Kohlenforschung; Kaiser-Wilhelm-Platz 1 45470 Mülheim an der Ruhr Deutschland
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6
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Chang MY, Cheng YC. Synthesis of Substituted Tetralins and Benzosuberans via BF3·OEt2-Mediated Formal (4 + 2) and (5 + 2) Stereocontrolled Cycloaddition of 4-Alkenols with Veratrol. Org Lett 2016; 18:608-11. [DOI: 10.1021/acs.orglett.5b03696] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Meng-Yang Chang
- Department
of Medicinal and Applied Chemistry, Kaohsiung Medical University, Kaohsiung 807, Taiwan
| | - Yu-Chieh Cheng
- Department
of Medicinal and Applied Chemistry, Kaohsiung Medical University, Kaohsiung 807, Taiwan
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7
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Vincent-Rocan JF, Ivanovich RA, Clavette C, Leckett K, Bejjani J, Beauchemin AM. Cascade reactions of nitrogen-substituted isocyanates: a new tool in heterocyclic chemistry. Chem Sci 2016; 7:315-328. [PMID: 29861985 PMCID: PMC5952554 DOI: 10.1039/c5sc03197d] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2015] [Accepted: 09/22/2015] [Indexed: 11/25/2022] Open
Abstract
In contrast to normal C-substituted isocyanates, nitrogen-substituted isocyanates (N-isocyanates) are rare. Their high reactivity and amphoteric/ambident nature has prevented the scientific community from exploiting their synthetic potential. Recently, we have developed an in situ formation approach using a reversible equilibrium, which allows controlled generation and reactivity of N-isocyanates and prevents the dimerization that is typically observed with these intermediates. This blocked (masked) N-isocyanate approach enables the use of various N-isocyanate precursors to assemble heterocycles possessing the N-N-C[double bond, length as m-dash]O motif, which is often found in agrochemicals and pharmaceuticals. Cascade reactions for the rapid assembly of several valuable 5- and 6-membered heterocycles are reported, including amino-hydantoins, acyl-pyrazoles, acyl-phthalazinones and azauracils. Over 100 different compounds were synthesized using amino-, imino- and amido-substituted N-isocyanates, demonstrating their potential as powerful intermediates in heterocyclic synthesis. Their reactivity also enables access to unprecedented bicyclic derivatives and to substitution patterns of azauracils that are difficult to access using known methods, illustrating that controlled reactivity of N-isocyanates provides new disconnections, and a new tool to assemble complex N-N-C[double bond, length as m-dash]O containing motifs.
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Affiliation(s)
- Jean-François Vincent-Rocan
- Centre for Catalysis Research and Innovation , Department of Chemistry and Biomolecular Sciences , University of Ottawa , 10 Marie-Curie , Ottawa , ON K1N 6N5 , Canada .
| | - Ryan A Ivanovich
- Centre for Catalysis Research and Innovation , Department of Chemistry and Biomolecular Sciences , University of Ottawa , 10 Marie-Curie , Ottawa , ON K1N 6N5 , Canada .
| | - Christian Clavette
- Centre for Catalysis Research and Innovation , Department of Chemistry and Biomolecular Sciences , University of Ottawa , 10 Marie-Curie , Ottawa , ON K1N 6N5 , Canada .
| | - Kyle Leckett
- Centre for Catalysis Research and Innovation , Department of Chemistry and Biomolecular Sciences , University of Ottawa , 10 Marie-Curie , Ottawa , ON K1N 6N5 , Canada .
| | - Julien Bejjani
- Centre for Catalysis Research and Innovation , Department of Chemistry and Biomolecular Sciences , University of Ottawa , 10 Marie-Curie , Ottawa , ON K1N 6N5 , Canada .
| | - André M Beauchemin
- Centre for Catalysis Research and Innovation , Department of Chemistry and Biomolecular Sciences , University of Ottawa , 10 Marie-Curie , Ottawa , ON K1N 6N5 , Canada .
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9
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10
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St. Denis JD, He Z, Yudin AK. Amphoteric α-Boryl Aldehyde Linchpins in the Synthesis of Heterocycles. ACS Catal 2015. [DOI: 10.1021/acscatal.5b00790] [Citation(s) in RCA: 53] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
- Jeffrey D. St. Denis
- Davenport Research Laboratories,
Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, Ontario, Canada M5S 3H6
| | - Zhi He
- Davenport Research Laboratories,
Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, Ontario, Canada M5S 3H6
| | - Andrei K. Yudin
- Davenport Research Laboratories,
Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, Ontario, Canada M5S 3H6
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11
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Zhao W, Lu Z, Wulff WD. β-amino esters from the reductive ring opening of aziridine-2-carboxylates. J Org Chem 2014; 79:10068-80. [PMID: 25329528 PMCID: PMC4227569 DOI: 10.1021/jo501694h] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2014] [Indexed: 11/30/2022]
Abstract
A general study is undertaken to examine the scope of the reductive ring opening of aziridine-2-carboxylates with samarium diiodide. The competition between C-C and C-N bond cleavage is examined as a function of the nature of the N-substituent of the aziridine, the nature of the substituent in the 3-position of the aziridine, and whether the substituent in the 3-position is in a cis or trans relationship with the carboxylate in the 2-position. The desired C-N bond cleavage leads to β-amino esters that are the predominant products for most aziridines with an N-activating group. However, C-C cleavage products are observed with an aryl group in the 3-position; this can be particularly pronounced with cis-aziridines where a nearly equal mixture of the two is observed. Exclusive formation of the C-N cleavage product is observed for all aziridines with the strongly N-activating p-toluene sulfonate group. Similarly high selectivity is observed for the 2-trimethylsilylethyl sulfonate group (SES), which is easier to remove. The utility of these methods is illustrated in the synthesis of protected forms of (R)-β(3)-DOPA and L-DOPA from the same aziridine, the former by SmI2-mediated reductive opening at C-2 and the latter by palladium-mediated reductive opening at C-3.
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Affiliation(s)
- Wenjun Zhao
- Department of Chemistry, Michigan
State University, East Lansing, Michigan 48824, United States
| | - Zhenjie Lu
- Department of Chemistry, Michigan
State University, East Lansing, Michigan 48824, United States
| | - William D. Wulff
- Department of Chemistry, Michigan
State University, East Lansing, Michigan 48824, United States
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12
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Zaretsky S, Adachi S, Rotstein BH, Hickey JL, Scully CCG, St Denis JD, Courtemanche R, Yu JCY, Chung BKW, Yudin AK. Stereocontrolled disruption of the Ugi reaction toward the production of chiral piperazinones: substrate scope and process development. J Org Chem 2014; 79:9948-57. [PMID: 25254948 DOI: 10.1021/jo5018316] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The factors determining diastereoselectivity observed in the multicomponent conversion of amino acids, aziridine aldehyde dimers, and isocyanides into chiral piperazinones have been investigated. Amino acid-dependent selectivity for either trans- or cis-substituted piperazinone products has been achieved. An experimentally determined diastereoselectivity model for the three-component reaction driven by aziridine aldehyde dimers has predictive value for different substrate classes. Moreover, this model is useful in reconciling the previously reported observations in multicomponent reactions between isocyanides, α-amino acids, and monofunctional aldehydes.
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Affiliation(s)
- Serge Zaretsky
- Davenport Research Laboratories, Department of Chemistry, University of Toronto , 80 St. George Street, Toronto, Ontario M5S 3H6, Canada
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13
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He Z, Zajdlik A, Yudin AK. Air- and moisture-stable amphoteric molecules: enabling reagents in synthesis. Acc Chem Res 2014; 47:1029-40. [PMID: 24495255 DOI: 10.1021/ar400210c] [Citation(s) in RCA: 78] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
Researchers continue to develop chemoselective synthesis strategies with the goal of rapidly assembling complex molecules. As one appealing approach, chemists are searching for new building blocks that include multiple functional groups with orthogonal chemical reactivity. Amphoteric molecules that possess nucleophilic and electrophilic sites offer a versatile platform for the development of chemoselective transformations. As part of a program focused on new methods of synthesis, we have been developing this type of reagents. This Account highlights examples of amphoteric molecules developed by our lab since 2006. We have prepared and evaluated aziridine aldehydes, a class of stable unprotected α-amino aldehydes. Structurally, aziridine aldehydes include both a nucleophilic amine nitrogen and an electrophilic aldehyde carbon over the span of three atoms. Under ambient conditions, these compounds exist as homochiral dimers with an aziridine-fused five-membered cyclic hemiaminal structure. We have investigated chemoselective reactions of aziridine aldehydes that involve both the aziridine and aldehyde functionalities. These transformations have produced a variety of densely functionalized nitrogen-containing compounds, including amino aldehydes, 1,2-diamines, reduced hydantoins, C-vinyl or alkynyl aziridines, and macrocyclic peptides. We have also developed air- and moisture-stable α-boryl aldehydes, another class of molecules that are kinetically amphoteric. The α-boryl aldehydes contain a tetracoordinated N-methyliminodiacetyl (MIDA) boryl substituent, which stabilizes the α-metalloid carbonyl system and prevents isomerization to its O-bond enolate form. Primarily taking advantage of chemoselective transformations at the aldehyde functionality, these α-boryl aldehydes have allowed us to synthesize a series of new functionalized boron-containing compounds that are difficult or impossible to prepare using established protocols, such as α-borylcarboxylic acids, boryl alcohols, enol ethers, and enamides. Using α-borylcarboxylic acids as starting materials, we have also prepared several new amphoteric borylated reagents, such as α-boryl isocyanates, isocyanides, and acylboronates. These compounds are versatile building blocks in their own right, enabling the rapid synthesis of other boron-containing molecules.
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Affiliation(s)
- Zhi He
- Davenport Research Laboratories, Department of Chemistry, University of Toronto, 80 St. George Street, Toronto M5S 3H6, Canada
| | - Adam Zajdlik
- Davenport Research Laboratories, Department of Chemistry, University of Toronto, 80 St. George Street, Toronto M5S 3H6, Canada
| | - Andrei K. Yudin
- Davenport Research Laboratories, Department of Chemistry, University of Toronto, 80 St. George Street, Toronto M5S 3H6, Canada
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14
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Halskov KS, Naicker T, Jensen ME, Jørgensen KA. Organocatalytic asymmetric remote aziridination of 2,4-dienals. Chem Commun (Camb) 2014; 49:6382-4. [PMID: 23748437 DOI: 10.1039/c3cc43506g] [Citation(s) in RCA: 69] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Highly regio- and stereoselective remote aziridination of 2,4-dienals has been developed, based on a vinylogous iminium-ion-dienamine catalytic cascade reaction. Transformations of the aziridine products into enantioenriched motifs are also demonstrated. Furthermore, the reaction concept is extended to include enantioselective 1,6-addition of thiols.
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Affiliation(s)
- Kim Søholm Halskov
- Center for Catalysis, Aarhus University, Langelandsgade 140, DK-8000 Aarhus C, Denmark
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15
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Adams CS, Grigg RD, Schomaker JM. Complete stereodivergence in the synthesis of 2-amino-1,3-diols from allenes. Chem Sci 2014. [DOI: 10.1039/c4sc01214c] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
Herein, we describe studies to understand how both reagent and substrate control can be effectively employed in the stereodivergent oxidative amination of allenes, with transfer of the axial chirality of an enantioenriched precursor to point chirality in each possible diastereomeric 2-amino-1,3-diol product.
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Affiliation(s)
| | - R. David Grigg
- Department of Chemistry
- University of Wisconsin
- Madison, USA
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16
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Molnár IG, Tanzer EM, Daniliuc C, Gilmour R. Enantioselective aziridination of cyclic enals facilitated by the fluorine-iminium ion gauche effect. Chemistry 2013; 20:794-800. [PMID: 24338989 DOI: 10.1002/chem.201303586] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2013] [Indexed: 11/11/2022]
Abstract
The enantioselective, organocatalytic aziridination of small, medium and macro-cyclic enals is reported using (S)-2-(fluorodiphenyl methyl)-pyrrolidine. Central to the reaction design is the reversible formation of a β-fluoroiminium ion intermediate, which is pre-organised on account of the fluorine-iminium ion gauche effect. This conformational effect positions the fluorine substituent synclinal-endo to the electropositive nitrogen centre thus benefiting from favourable stereoelectronic and electrostatic interactions (σC-H →σC-F *; F(δ-…︁) N(+) ). Consequently, one of the shielding groups on the fluorine-bearing carbon atom is positioned above the π-system, forming the basis of an enantioinduction strategy. Treatment of this intermediate with a "nitrene" source furnished a series of novel, optically active aziridines (e.r. up to 99.5:0.5). Further derivatisation of the product aziridines gives facile access to various amino acid derivatives, including β-fluoroamino acids. Crystallographic analyses of both the aziridines and their derivatives are disclosed.
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Affiliation(s)
- István Gábor Molnár
- Organisch-Chemisches Institut and Graduate School of Chemistry, Westfälische Wilhelms-Universität Münster, Corrensstrasse 40, 48149 Münster (Germany), Homepage: www.uni-muenster.de/Chemie.oc/gilmour
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17
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He Z, Dobrovolsky D, Trinchera P, Yudin AK. Synthesis of Multisubstituted Pyridines. Org Lett 2012; 15:334-7. [PMID: 23273041 DOI: 10.1021/ol303246b] [Citation(s) in RCA: 59] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Zhi He
- Davenport Research Laboratories, Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, Ontario, M5S 3H6, Canada
| | - Dennis Dobrovolsky
- Davenport Research Laboratories, Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, Ontario, M5S 3H6, Canada
| | - Piera Trinchera
- Davenport Research Laboratories, Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, Ontario, M5S 3H6, Canada
| | - Andrei K. Yudin
- Davenport Research Laboratories, Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, Ontario, M5S 3H6, Canada
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18
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St Denis JD, He Z, Yudin AK. Chemoselective palladium-catalyzed α-allylation of α-boryl aldehydes. Org Biomol Chem 2012; 10:7900-2. [PMID: 22911058 DOI: 10.1039/c2ob26503f] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Herein we report the development of an α-allylation reaction of α-boryl aldehydes that preserves the carbon-boron bond under Pd(0)/Pd(II) catalysis. A variety of α-boryl aldehydes and allylic alcohols participate in this chemoselective transformation. The α-allylated products were obtained as single regioisomers.
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Affiliation(s)
- Jeffrey D St Denis
- Davenport Research Laboratories, Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, Ontario M5H 3H5, Canada
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19
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Assem N, Hili R, He Z, Kasahara T, Inman BL, Decker S, Yudin AK. Role of Reversible Dimerization in Reactions of Amphoteric Aziridine Aldehydes. J Org Chem 2012; 77:5613-23. [DOI: 10.1021/jo3007418] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Naila Assem
- Davenport
Research Laboratories, Department of Chemistry, University of Toronto, 80 St. George Street, Toronto,
Ontario, Canada M5S 3H6
| | - Ryan Hili
- Davenport
Research Laboratories, Department of Chemistry, University of Toronto, 80 St. George Street, Toronto,
Ontario, Canada M5S 3H6
| | - Zhi He
- Davenport
Research Laboratories, Department of Chemistry, University of Toronto, 80 St. George Street, Toronto,
Ontario, Canada M5S 3H6
| | - Takahito Kasahara
- Davenport
Research Laboratories, Department of Chemistry, University of Toronto, 80 St. George Street, Toronto,
Ontario, Canada M5S 3H6
| | - Brittany L. Inman
- Davenport
Research Laboratories, Department of Chemistry, University of Toronto, 80 St. George Street, Toronto,
Ontario, Canada M5S 3H6
| | - Shannon Decker
- Davenport
Research Laboratories, Department of Chemistry, University of Toronto, 80 St. George Street, Toronto,
Ontario, Canada M5S 3H6
| | - Andrei K. Yudin
- Davenport
Research Laboratories, Department of Chemistry, University of Toronto, 80 St. George Street, Toronto,
Ontario, Canada M5S 3H6
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20
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Zhao W, Wang Z, Sun J. Synthesis of eight-membered lactones: intermolecular [6+2] cyclization of amphoteric molecules with siloxy alkynes. Angew Chem Int Ed Engl 2012; 51:6209-13. [PMID: 22588830 DOI: 10.1002/anie.201200513] [Citation(s) in RCA: 86] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2012] [Revised: 04/02/2012] [Indexed: 01/26/2023]
Affiliation(s)
- Wanxiang Zhao
- Department of Chemistry, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China
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21
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Zhao W, Wang Z, Sun J. Synthesis of Eight-Membered Lactones: Intermolecular [6+2] Cyclization of Amphoteric Molecules with Siloxy Alkynes. Angew Chem Int Ed Engl 2012. [DOI: 10.1002/ange.201200513] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Cheung LLW, He Z, Decker SM, Yudin AK. Skeletal Fusion of Small Heterocycles with Amphoteric Molecules. Angew Chem Int Ed Engl 2011; 50:11798-802. [PMID: 21990009 DOI: 10.1002/anie.201106024] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2011] [Indexed: 12/12/2022]
Affiliation(s)
- Lawrence L W Cheung
- Davenport Research Laboratories, Department of Chemistry, University of Toronto, 80 St. George St., Toronto, ON, M5S 3H6, Canada
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24
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Cheung LLW, He Z, Decker SM, Yudin AK. Skeletal Fusion of Small Heterocycles with Amphoteric Molecules. Angew Chem Int Ed Engl 2011. [DOI: 10.1002/ange.201106024] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Abstract
A new class of stable molecules, α-boryl aldehydes, has been prepared from oxiranyl N-methyliminodiacetyl boronates by a 1,2-boryl migration with concomitant epoxide scission. A range of boryl imines, alkenes, alcohols, acids, enol ethers, enamides, and other functionalized boronic acid derivatives that are difficult or impossible to prepare using established protocols can be accessed from α-boryl aldehydes. The chemoselective transformations of these building blocks, including the facile synthesis of functionalized unnatural amino acids from silyloxy and amido vinyl boronates, attest to the potential of α-boryl aldehydes in chemical synthesis.
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Affiliation(s)
- Zhi He
- Davenport Research Laboratories, Department of Chemistry, University of Toronto, Ontario, Canada
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26
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Rolfe A, Samarakoon TB, Hanson PR. Formal [4+3] epoxide cascade reaction via a complementary ambiphilic pairing strategy. Org Lett 2010; 12:1216-9. [PMID: 20178346 PMCID: PMC2864497 DOI: 10.1021/ol100035e] [Citation(s) in RCA: 59] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A formal [4+3] epoxide cascade protocol utilizing ambiphilic sulfonamides and a variety of epoxides (masked ambiphiles) has been developed for the generation of benzothiaoxazepine-1,1'-dioxides and oxathiazepine-1,1'-dioxides. This protocol combines an epoxide ring-opening with either an S(N)Ar or oxa-Michael cyclization pathway.
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Affiliation(s)
- Alan Rolfe
- Department of Chemistry, University of Kansas, 1251 Wescoe Hall Drive, Lawrence, KS, 66045 and The University of Kansas Center for Chemical Methodologies and Library Development (KU-CMLD), 2121 Simons Drive, West Campus, Lawrence, KS, 66047
| | - Thiwanka B. Samarakoon
- Department of Chemistry, University of Kansas, 1251 Wescoe Hall Drive, Lawrence, KS, 66045 and The University of Kansas Center for Chemical Methodologies and Library Development (KU-CMLD), 2121 Simons Drive, West Campus, Lawrence, KS, 66047
| | - Paul R. Hanson
- Department of Chemistry, University of Kansas, 1251 Wescoe Hall Drive, Lawrence, KS, 66045 and The University of Kansas Center for Chemical Methodologies and Library Development (KU-CMLD), 2121 Simons Drive, West Campus, Lawrence, KS, 66047
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Hili R, Rai V, Yudin AK. Macrocyclization of Linear Peptides Enabled by Amphoteric Molecules. J Am Chem Soc 2010; 132:2889-91. [PMID: 20155938 DOI: 10.1021/ja910544p] [Citation(s) in RCA: 188] [Impact Index Per Article: 13.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Ryan Hili
- Davenport Research Laboratories, Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, Ontario, Canada M5S 3H6
| | - Vishal Rai
- Davenport Research Laboratories, Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, Ontario, Canada M5S 3H6
| | - Andrei K. Yudin
- Davenport Research Laboratories, Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, Ontario, Canada M5S 3H6
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He Z, Yudin A. A Versatile Synthetic Platform Based on Strained Propargyl Amines. Angew Chem Int Ed Engl 2010. [DOI: 10.1002/ange.200906066] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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He Z, Yudin A. A Versatile Synthetic Platform Based on Strained Propargyl Amines. Angew Chem Int Ed Engl 2010; 49:1607-10. [DOI: 10.1002/anie.200906066] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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