1
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Bousselat A, Rouden J, Blanchet J. From Building Blocks to Catalysts: The Underinvestigated Potential of Boronic Acid Esters. J Org Chem 2024; 89:11009-11013. [PMID: 38995625 DOI: 10.1021/acs.joc.4c00775] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/13/2024]
Abstract
Lewis acids are crucial in chemistry, with applications in pharmaceuticals, agrochemicals, and materials science. In main-group chemistry, they offer alternatives to transition metals, prompting our study of halogenated boronic acid esters (BAEs). Although BAEs are well-known, their catalytic potential has been overlooked. Our investigation found their Lewis acidity superior to that of boron trifluoride and comparable to that of tris(pentafluorophenyl)borane. Additionally, their catalysis of the Sakurai allylation of aldehydes has been documented, paving the way for future advancements.
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Affiliation(s)
- Ava Bousselat
- LCMT, ENSICAEN, UNICAEN et CNRS, 6 bd du Maréchal Juin, 14050 Caen, France
| | - Jacques Rouden
- LCMT, ENSICAEN, UNICAEN et CNRS, 6 bd du Maréchal Juin, 14050 Caen, France
| | - Jérôme Blanchet
- LCMT, ENSICAEN, UNICAEN et CNRS, 6 bd du Maréchal Juin, 14050 Caen, France
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2
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Rose BJ, Brewer M. Lewis acid mediated allylation of vinyl diazonium ions by allylstannanes. Org Biomol Chem 2024; 22:4274-4277. [PMID: 38747167 PMCID: PMC11191702 DOI: 10.1039/d4ob00254g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/30/2024]
Abstract
The Lewis acid mediated reaction of allyltributylstannane compounds with β-hydroxy-α-diazo carbonyls gives β-allyl-α-diazo carbonyl products in good yields. This reaction proceeds via a vinyl diazonium ion intermediate which is intercepted by the allylstannane nucleophile. Importantly, the diazo functional group is retained over the course of the reaction to give diazo-containing scaffolds with increased molecular complexity. Methallyltrimethylsilane also serves as a functional allyl transfer reagent in this reaction.
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Affiliation(s)
- Benjamin J Rose
- 82 University Place, Department of Chemistry, University of Vermont, Burlington, VT 05401, USA.
| | - Matthias Brewer
- 82 University Place, Department of Chemistry, University of Vermont, Burlington, VT 05401, USA.
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3
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Lal N, Shirsath SB, Singh P, Deepshikha, Shaikh AC. Allylsilane as a versatile handle in photoredox catalysis. Chem Commun (Camb) 2024; 60:4633-4647. [PMID: 38606528 DOI: 10.1039/d4cc00734d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/13/2024]
Abstract
Organosilanes have secured a special place in the synthetic world for several decades. However, among them, allylsilanes are a choice reagent for organic chemists to develop novel organic transformations. In recent years researchers have proved that visible-light photoredox catalysis has emerged as one of the most mild, sustainable, straightforward, and efficient strategies to construct simple to complex molecules with or without enantioselectivity. This review provides an in-depth analysis of recent advances and strategies employed in visible-light photoredox catalysis for allylsilane and its analogues for the development of various organic transformations. The review is divided into sections, each focused on a specific reactivity of allylsilane under light irradiation with C(sp2) center arene or alkene, C(sp2) center carbonyl, and C(sp3) center carbon functionality. In this review, we present optimization data, reaction scope, and mechanistic aspects to bring forward specific reactivity and selectivity trends of allylsilane in photoredox conditions.
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Affiliation(s)
- Nand Lal
- Department of Chemistry, Indian Institute of Technology, Ropar (IIT Ropar), Rupnagar, Punjab 140 001, India.
| | - Sanket B Shirsath
- Department of Chemistry, Indian Institute of Technology, Ropar (IIT Ropar), Rupnagar, Punjab 140 001, India.
| | - Puja Singh
- Department of Chemistry, Indian Institute of Technology, Ropar (IIT Ropar), Rupnagar, Punjab 140 001, India.
| | - Deepshikha
- Department of Chemistry, Indian Institute of Technology, Ropar (IIT Ropar), Rupnagar, Punjab 140 001, India.
| | - Aslam C Shaikh
- Department of Chemistry, Indian Institute of Technology, Ropar (IIT Ropar), Rupnagar, Punjab 140 001, India.
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4
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Fastie C, Li L, Bätcher M, Hilt G. Pre-electrolysis of LiClO 4 in Acetonitrile: Electrochemically Induced Protolytic Carbon-Carbon Bond Formation of Benzylic Ethers and Acetals with Allyl Trimethylsilane and Other Carbon Nucleophiles. J Org Chem 2023; 88:12526-12530. [PMID: 37594465 PMCID: PMC10476155 DOI: 10.1021/acs.joc.3c01256] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2023] [Indexed: 08/19/2023]
Abstract
The pre-electrolysis of LiClO4 in acetonitrile in an undivided cell applying only "catalytic" amounts of current (e.g., 0.05 F) led to the formation of a strong acidic medium for the activation of benzylic ethers and acetals. The activated primary and secondary benzylic ethers and acetals could be converted with a range of carbon nucleophiles, such as allyl trimethylsilane, silyl enol ethers, and enol acetates, for the formation of new carbon-carbon bonds. A chemoselective reaction was observed when electron-deficient benzylic acetals were converted with allyl trimethylsilane to the monoallylated products, whereas an electron-rich benzylic acetal led to the double allylated product under activation of both ether groups.
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Affiliation(s)
- Cornelius Fastie
- Institut für Chemie,
Universität Oldenburg, Carl-von-Ossietzky-Str. 9-11, Oldenburg D-26129, Germany
| | - Luomo Li
- Institut für Chemie,
Universität Oldenburg, Carl-von-Ossietzky-Str. 9-11, Oldenburg D-26129, Germany
| | - Moritz Bätcher
- Institut für Chemie,
Universität Oldenburg, Carl-von-Ossietzky-Str. 9-11, Oldenburg D-26129, Germany
| | - Gerhard Hilt
- Institut für Chemie,
Universität Oldenburg, Carl-von-Ossietzky-Str. 9-11, Oldenburg D-26129, Germany
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5
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Sivaramakrishna A, Pete S, Mandar Mhaskar C, Ramann H, Venkata Ramanaiah D, Arbaaz M, Niyaz M, Janardan S, Suman P. Role of hypercoordinated silicon(IV) complexes in activation of carbon–silicon bonds: An overview on utility in synthetic chemistry. Coord Chem Rev 2023. [DOI: 10.1016/j.ccr.2023.215140] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/03/2023]
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6
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Mayer RJ, Hampel N, Ofial AR, Mayr H. Resolving the Mechanistic Complexity in Triarylborane-Induced Conjugate Additions. ACS Catal 2022. [DOI: 10.1021/acscatal.2c04905] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/02/2022]
Affiliation(s)
- Robert J. Mayer
- Department Chemie, Ludwig-Maximilians-Universität München, Butenandtstr. 5-13, 81377München, Germany
| | - Nathalie Hampel
- Department Chemie, Ludwig-Maximilians-Universität München, Butenandtstr. 5-13, 81377München, Germany
| | - Armin R. Ofial
- Department Chemie, Ludwig-Maximilians-Universität München, Butenandtstr. 5-13, 81377München, Germany
| | - Herbert Mayr
- Department Chemie, Ludwig-Maximilians-Universität München, Butenandtstr. 5-13, 81377München, Germany
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7
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Gao C, Blum SA. Silyl Radical Cascade Cyclization of 2-Isocyanothioanisole toward 2-Silylbenzothiazoles through Radical Initiator-Inhibitor Symbiosis. J Org Chem 2022; 87:13124-13137. [PMID: 36098507 DOI: 10.1021/acs.joc.2c01605] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A demethylative silyl radical cascade cyclization of 2-isocyanothioanisoles toward 2-silylated benzothiazole building blocks has been developed. The development of a "radical initiator-inhibitor symbiosis" system solves the challenge of otherwise dominant methyl radical-triggered side reactions brought about by kinetically unfavored generation of reactive silyl radical species. The products accessed in this protocol are amendable to various downstream functionalization reactions, including the quick construction of a topoisomerase II inhibitor via a Hiyama cross-coupling reaction and of an antiviral agent via a fluoride-/hydroxide-free nucleophilic substitution to acyl chloride.
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Affiliation(s)
- Chao Gao
- Department of Chemistry, University of California, Irvine, Irvine, California 92697-2025, United States
| | - Suzanne A Blum
- Department of Chemistry, University of California, Irvine, Irvine, California 92697-2025, United States
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8
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Hinz DJ, Zhang L, Lee JK. Mass spectrometry in organic and bio-organic catalysis: Using thermochemical properties to lend insight into mechanism. MASS SPECTROMETRY REVIEWS 2022. [PMID: 35899315 DOI: 10.1002/mas.21797] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
In this review, we discuss gas phase experimentation centered on the measurement of acidity and proton affinity of substrates that are useful for understanding catalytic mechanisms. The review is divided into two parts. The first covers examples of organocatalysis, while the second focuses on biological catalysis. The utility of gas phase acidity and basicity values for lending insight into mechanisms of catalysis is highlighted.
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Affiliation(s)
- Damon J Hinz
- Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, New Brunswick, New Jersey, USA
| | - Lanxin Zhang
- Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, New Brunswick, New Jersey, USA
| | - Jeehiun K Lee
- Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, New Brunswick, New Jersey, USA
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9
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Casali E, Porta A, Toma L, Zanoni G. Oxo-Rhenium-Mediated Allylation of Furanoside Derivatives: A Computational Study on the Mechanism and the Stereoselectivity. J Org Chem 2022; 87:9497-9506. [PMID: 35820228 PMCID: PMC9361356 DOI: 10.1021/acs.joc.2c00393] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
![]()
Properly substituted tetrahydrofuran (THF) rings are
important
building blocks in the synthesis of many natural metabolites. Having
reliable procedures to control the stereoselectivity at the THF core
while decorating it with different substituents is a fundamental requirement
to achieve and fulfill the complexity of nature. We recently reported
a new chemical approach to control the stereochemistry in the alkylation
and arylation of furanoside derivatives by using a rhenium(V) complex
to form an intermediate oxo-carbenium species able to react with proper
soft nucleophiles. Here, we describe theoretical calculations, performed
at the DFT B3LYP level, to disclose the important mechanistic features
which regulate the entire catalytic cycle of the reaction of mono-
and disubstituted furanosides with allyltrimethylsilane catalyzed
by Re(O)Cl3(OPPh3)(Me2S). Moreover,
the key factors governing the allylation step were investigated, confirming
that the stereoselectivity, which is independent of the anomeric configuration
of starting acetal, mainly arises from the orientation of the substituent
at C-4, with only marginal contribution of the substituent at C-5.
Finally, puckering Cremer–Pople parameters were used to take
trace of the structural modifications throughout the catalytic cycle.
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Affiliation(s)
- Emanuele Casali
- Department of Chemistry, University of Pavia, Viale Taramelli, 12, 27100 Pavia, Italy
| | - Alessio Porta
- Department of Chemistry, University of Pavia, Viale Taramelli, 12, 27100 Pavia, Italy
| | - Lucio Toma
- Department of Chemistry, University of Pavia, Viale Taramelli, 12, 27100 Pavia, Italy
| | - Giuseppe Zanoni
- Department of Chemistry, University of Pavia, Viale Taramelli, 12, 27100 Pavia, Italy
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10
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Affiliation(s)
- Dean D. Roberts
- Department of Chemistry Lancaster University Bailrigg Lancaster LA1 4YB UK
| | - Mark G. McLaughlin
- Department of Chemistry Lancaster University Bailrigg Lancaster LA1 4YB UK
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11
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Anderson SM, Van Engen MD, Floreancig PE. Solvent Effects and Mechanistic Studies for Re 2O 7-Catalyzed Allylative Annulation Reactions. J Org Chem 2021; 87:1830-1839. [PMID: 34932336 DOI: 10.1021/acs.joc.1c02466] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The sequence of allylic alcohol transposition, carbonyl group trapping, oxocarbenium ion formation, and nucleophilic addition results in the formation of a ring while serving as a fragment-coupling and stereocenter-generating reaction. Successful applications of these processes require a balancing of the kinetics of numerous productive and unproductive steps. This work describes the manner in which solvent changes can be used to expand the scope and change the stereochemical outcomes of these processes. Mechanistic studies provide greater insight into the nuances of the transformations and the reactive species that are generated.
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Affiliation(s)
- Shelby M Anderson
- Department of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
| | - Marcus D Van Engen
- Department of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
| | - Paul E Floreancig
- Department of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
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12
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Gao C, Blum SA. Main-group metalated heterocycles through Lewis acid cyclization. TRENDS IN CHEMISTRY 2021. [DOI: 10.1016/j.trechm.2021.05.005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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13
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Probasco KC, Jennings MP. Stereoselective Halo-Succinimide Facilitated α-Halogenations of Substituted α-Trialkylsilyl-β-Substituted-α,β-Unsaturated Esters. J Org Chem 2021; 86:8945-8954. [PMID: 34161091 DOI: 10.1021/acs.joc.1c00876] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The NXS (X = Cl, Br)-mediated halogenation of a series of (E)-α-trimethylsilyl-β-alkyl(aryl)-α,β-unsaturated esters in dimethylformamide (DMF) has furnished (Z)-β-substituted-α-halogenated-α,β-unsaturated ester products in moderate to high isolated yields (58-90%) with dr values of >20:1 coupled with the inversion of olefin stereochemistry. The reaction process was hypothesized to include an initial halonium cation intermediate, followed by regioselective ring opening with DMF. Subsequent anti-E2-type concomitant elimination allowed for the stereoselective formation of the product vinylic bromo-and chloroesters.
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Affiliation(s)
- Kristina C Probasco
- Department of Chemistry and Biochemistry, The University of Alabama, 250 Hackberry Lane, Tuscaloosa, Alabama 35487-0336, United States
| | - Michael P Jennings
- Department of Chemistry and Biochemistry, The University of Alabama, 250 Hackberry Lane, Tuscaloosa, Alabama 35487-0336, United States
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14
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Casali E, Othman ST, Dezaye AA, Chiodi D, Porta A, Zanoni G. Highly Stereoselective Glycosylation Reactions of Furanoside Derivatives via Rhenium (V) Catalysis. J Org Chem 2021; 86:7672-7686. [PMID: 34033490 PMCID: PMC8279489 DOI: 10.1021/acs.joc.1c00706] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A novel approach for the formation of anomeric carbon-functionalized furanoside systems was accomplished through the employment of an oxo-rhenium catalyst. The transformation boasts a broad range of nucleophiles including allylsilanes, enol ethers, and aromatics in addition to sulfur, nitrogen, and hydride donors, able to react with an oxocarbenium ion intermediate derived from furanosidic structures. The excellent stereoselectivities observed followed the Woerpel model, ultimately providing 1,3-cis-1,4-trans systems. In the case of electron-rich aromatic nucleophiles, an equilibration occurs at the anomeric center with the selective formation of 1,3-trans-1,4-cis systems. This anomalous result was rationalized through density functional theory calculations. Different oxocarbenium ions such as those derived from dihydroisobenzofuran, pyrrolidine, and oxazolidine heterocycles can also be used as a substrate for the oxo-Re-mediated allylation reaction.
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Affiliation(s)
- Emanuele Casali
- Department of Chemistry, University of Pavia, Viale Taramelli, 12, Pavia 27100, Italy
| | - Sirwan T Othman
- Department of Chemistry, College of Science, Salahaddin University-Erbil, Erbil 44002, Iraq
| | - Ahmed A Dezaye
- International University of Erbil, Newroz Street, Erbil-Kurdistan 44001, Iraq
| | - Debora Chiodi
- Department of Chemistry, University of Pavia, Viale Taramelli, 12, Pavia 27100, Italy
| | - Alessio Porta
- Department of Chemistry, University of Pavia, Viale Taramelli, 12, Pavia 27100, Italy
| | - Giuseppe Zanoni
- Department of Chemistry, University of Pavia, Viale Taramelli, 12, Pavia 27100, Italy
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15
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Saridakis I, Kaiser D, Maulide N. Unconventional Macrocyclizations in Natural Product Synthesis. ACS CENTRAL SCIENCE 2020; 6:1869-1889. [PMID: 33274267 PMCID: PMC7706100 DOI: 10.1021/acscentsci.0c00599] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/11/2020] [Indexed: 06/12/2023]
Abstract
Over the past several decades, macrocyclic compounds have emerged as increasingly significant therapeutic candidates in drug discovery. Their pharmacological activity hinges on their rotationally restricted three-dimensional orientation, resulting in a unique conformational preorganization and a high enthalpic gain as a consequence of high-affinity macrocycle-protein binding interactions. Synthetic access to macrocyclic drug candidates is therefore crucial. From a synthetic point of view, the efficiency of macrocyclization events commonly suffers from entropic penalties as well as undesired intermolecular couplings (oligomerization). Although over the past several decades ring-closing metathesis, macrolactonization, or macrolactamization have become strategies of choice, the toolbox of organic synthesis provides a great number of versatile transformations beyond the aforementioned. This Outlook focuses on a selection of examples employing what we term unconventional macrocyclizations toward the synthesis of natural products or analogues.
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Affiliation(s)
- Iakovos Saridakis
- Institute
of Organic Chemistry, University of Vienna, Währinger Strasse 38, 1090 Vienna, Austria
| | - Daniel Kaiser
- Institute
of Organic Chemistry, University of Vienna, Währinger Strasse 38, 1090 Vienna, Austria
| | - Nuno Maulide
- Institute
of Organic Chemistry, University of Vienna, Währinger Strasse 38, 1090 Vienna, Austria
- Research
Platform for Next Generation Macrocycles, Währinger Strasse 38, 1090 Vienna, Austria
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16
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17
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Basson AJ, McLaughlin MG. Functionalisation of isoindolinones via a calcium catalysed Hosomi-Sakurai allylation. Chem Commun (Camb) 2019; 55:8317-8320. [PMID: 31257381 DOI: 10.1039/c9cc02450f] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
A rapid and functionally tolerant calcium catalysed Hosomi-Sakurai reaction has been realised. Employing 1 mol% calcium, allylated isoindolinones can be synthesised in high yields and the reaction is shown to be tolerant to a range of medicinally relevant functional groups including heterocycles. The synthetic utility of the reaction has been shown, and a plausible reaction mechanism is provided.
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Affiliation(s)
- Ashley J Basson
- Faculty of Science & Engineering, Department of Natural Sciences, Manchester Metropolitan University, Chester Street, Manchester, M1 5GD, UK.
| | - Mark G McLaughlin
- Faculty of Science & Engineering, Department of Natural Sciences, Manchester Metropolitan University, Chester Street, Manchester, M1 5GD, UK.
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18
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Zhang J, Hazra CK, Park S, Chang S. Metal‐Free Carbocyclization of Homoallylic Silyl Ethers Leading to Cyclopropanes and Cyclobutanes. ASIAN J ORG CHEM 2019. [DOI: 10.1002/ajoc.201900270] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Jianbo Zhang
- Center for Catalytic Hydrocarbon FunctionalizationsInstitute for Basic Science (IBS) Daejeon 34141 South Korea
- Department of ChemistryKorea Advanced Institute of Science & Technology (KAIST) Daejeon 34141 South Korea
| | - Chinmoy Kumar Hazra
- Center for Catalytic Hydrocarbon FunctionalizationsInstitute for Basic Science (IBS) Daejeon 34141 South Korea
- Department of ChemistryKorea Advanced Institute of Science & Technology (KAIST) Daejeon 34141 South Korea
| | - Sehoon Park
- Center for Catalytic Hydrocarbon FunctionalizationsInstitute for Basic Science (IBS) Daejeon 34141 South Korea
- Department of ChemistryKorea Advanced Institute of Science & Technology (KAIST) Daejeon 34141 South Korea
| | - Sukbok Chang
- Center for Catalytic Hydrocarbon FunctionalizationsInstitute for Basic Science (IBS) Daejeon 34141 South Korea
- Department of ChemistryKorea Advanced Institute of Science & Technology (KAIST) Daejeon 34141 South Korea
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19
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Marcantoni E, Palmieri A, Petrini M. Recent synthetic applications of α-amido sulfones as precursors of N-acylimino derivatives. Org Chem Front 2019. [DOI: 10.1039/c9qo00196d] [Citation(s) in RCA: 30] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
α-Amido sulfones can be directly used as N-acylimine or N-acyliminium ion precursors in several synthetic processes aimed at the preparation of nitrogen containing compounds. This review collects the most relevant and practical utilizations of α-amido sulfones appeared in the literature after 2005.
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Affiliation(s)
- Enrico Marcantoni
- School of Science and Technology
- Chemistry Division
- University of Camerino
- 1 I-62032 Camerino
- Italy
| | - Alessandro Palmieri
- School of Science and Technology
- Chemistry Division
- University of Camerino
- 1 I-62032 Camerino
- Italy
| | - Marino Petrini
- School of Science and Technology
- Chemistry Division
- University of Camerino
- 1 I-62032 Camerino
- Italy
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20
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Fang G, Liu Z, Cao S, Yuan H, Zhang J, Pan L. Interruption of Formal Schmidt Rearrangement/Hosomi-Sakurai Reaction of Vinyl Azides with Allyl/Propargylsilanes. Org Lett 2018; 20:7113-7116. [PMID: 30387360 DOI: 10.1021/acs.orglett.8b03062] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
An interrupted Schmidt rearrangement/Hosomi-Sakurai reaction of N-tosyl and S-substituted vinyl azides is reported. With BF3·Et2O as a Lewis acid promoter, the denitrogenative fragmentation of vinyl azides facilitates the generation of the N/ S-stabilized carbocations, which further undergo nucleophilic addition by allyl/propargylsilanes for C-C bond formation. As a result, a variety of homoallylic/allenylic amines can be afforded in good yields under mild reaction conditions with well-defined functional-group tolerance.
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Affiliation(s)
- Guichun Fang
- Jilin Province Key Laboratory of Organic Functional Molecular, Design & Synthesis, Department of Chemistry , Northeast Normal University , Changchun 130024 , China
| | - Zhenhua Liu
- College of Chemistry, Chemical Engineering and Materials Science , Shandong Normal University , Jinan 250014 , China
| | - Shanshan Cao
- Jilin Province Key Laboratory of Organic Functional Molecular, Design & Synthesis, Department of Chemistry , Northeast Normal University , Changchun 130024 , China
| | - Haiyan Yuan
- Jilin Province Key Laboratory of Organic Functional Molecular, Design & Synthesis, Department of Chemistry , Northeast Normal University , Changchun 130024 , China
| | - Jingping Zhang
- Jilin Province Key Laboratory of Organic Functional Molecular, Design & Synthesis, Department of Chemistry , Northeast Normal University , Changchun 130024 , China
| | - Ling Pan
- Jilin Province Key Laboratory of Organic Functional Molecular, Design & Synthesis, Department of Chemistry , Northeast Normal University , Changchun 130024 , China
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21
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Johnson DA, Mueller Hendrix AJ, Jennings MP. Diastereoselective Syntheses of (E)-α-Trialkylsilyl α,β-Unsaturated Esters, α-Silane-Substituted Conjugated Silyl Ketene Acetals, and α,γ-Substituted Allylsilanes. J Org Chem 2018; 83:9914-9928. [DOI: 10.1021/acs.joc.8b01209] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- David A. Johnson
- Department of Chemistry, The University of Alabama, 250 Hackberry
Lane, Tuscaloosa, Alabama 35487-0336, United States
| | - Amanda J. Mueller Hendrix
- Department of Chemistry, The University of Alabama, 250 Hackberry
Lane, Tuscaloosa, Alabama 35487-0336, United States
| | - Michael P. Jennings
- Department of Chemistry, The University of Alabama, 250 Hackberry
Lane, Tuscaloosa, Alabama 35487-0336, United States
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22
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Abstract
A novel reductive variant of the classical Hosomi-Sakurai reaction is reported. This transformation hinges on a redox-neutral, stereoselective internal reduction event under mild conditions. This operationally simple reaction relies on readily available starting materials and leads to useful products in diastereoselectivities of up to 7:1. The versatility of this new method is demonstrated through the stereoselective one-step synthesis of an AChE inhibitor.
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Affiliation(s)
- Adriano Bauer
- Institute of Organic Chemistry, University of Vienna , Währinger Straße 38, 1090 Vienna, Austria
| | - Nuno Maulide
- Institute of Organic Chemistry, University of Vienna , Währinger Straße 38, 1090 Vienna, Austria
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