1
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Nilova A, Mannchen MD, Noel AN, Semenova E, Grenning AJ. Vicinal stereocenters via asymmetric allylic alkylation and Cope rearrangement: a straightforward route to functionally and stereochemically rich heterocycles. Chem Sci 2023; 14:2755-2762. [PMID: 36908968 PMCID: PMC9993902 DOI: 10.1039/d2sc07021a] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2022] [Accepted: 02/13/2023] [Indexed: 02/16/2023] Open
Abstract
An asymmetric allylic alkylation/Cope rearrangement (AAA/[3,3]) capable of stereoselectively constructing vicinal stereocenters has been developed. Strategically integrated 4-methylation on the 3,3-dicyano-1,5-diene controls stereoselectivity and drives Cope rearrangement equilibrium in the forward direction. The AAA/[3,3] sequence rapidly converts abundant achiral and racemic starting materials into valuable (hetero)cycloalkane building blocks bearing significant functional and stereochemical complexity, highlighting the value of (hetero)cyclohexylidenemalononitriles as launching points for complex heterocycle synthesis. On this line, the resulting alkylidenemalononitrile moiety can be readily converted into amides via Hayashi-Lear amidation to ultimately yield amido-piperidines, tropanes, and related scaffolds with 3-5 stereocenters and drug-like functionality.
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Affiliation(s)
- Aleksandra Nilova
- Department of Chemistry, University of Florida PO Box 117200 Gainesville 32611 FL USA
| | - Michael D Mannchen
- Department of Chemistry, University of Florida PO Box 117200 Gainesville 32611 FL USA
| | - Abdias N Noel
- Department of Chemistry, University of Florida PO Box 117200 Gainesville 32611 FL USA
| | - Evgeniya Semenova
- Department of Chemistry, University of Florida PO Box 117200 Gainesville 32611 FL USA
| | - Alexander J Grenning
- Department of Chemistry, University of Florida PO Box 117200 Gainesville 32611 FL USA
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2
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De S, Tomiczek BM, Yang Y, Ko K, Ghiviriga I, Roitberg A, Grenning AJ. Diastereoselective Indole-Dearomative Cope Rearrangements by Compounding Minor Driving Forces. Org Lett 2022; 24:3726-3730. [PMID: 35576941 PMCID: PMC10112279 DOI: 10.1021/acs.orglett.2c01381] [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
Reported herein is the discovery of a diastereoselective indole-dearomative Cope rearrangement. A suite of minor driving forces promote dearomatization: (i) steric congestion in the starting material, (ii) alkylidene malononitrile and stilbene conjugation events in the product, and (iii) an unexpected intramolecular π-π* stack on the product side of the equilibrium. The key substrates are rapidly assembled from simple starting materials, resulting in many successful examples. The products are structurally complex and bear vicinal stereocenters generated by the dearomative Cope rearrangement. They also contain a variety of functional groups for interconversion to complex architectures.
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Affiliation(s)
- Subhadip De
- Department of Chemistry, University of Florida, P.O. Box 117200, Gainesville, Florida 32603, United States
| | - Breanna M Tomiczek
- Department of Chemistry, University of Florida, P.O. Box 117200, Gainesville, Florida 32603, United States
| | - Yinuo Yang
- Department of Chemistry, University of Florida, P.O. Box 117200, Gainesville, Florida 32603, United States
| | - Kenneth Ko
- Department of Chemistry, University of Florida, P.O. Box 117200, Gainesville, Florida 32603, United States
| | - Ion Ghiviriga
- Department of Chemistry, University of Florida, P.O. Box 117200, Gainesville, Florida 32603, United States
| | - Adrian Roitberg
- Department of Chemistry, University of Florida, P.O. Box 117200, Gainesville, Florida 32603, United States
| | - Alexander J Grenning
- Department of Chemistry, University of Florida, P.O. Box 117200, Gainesville, Florida 32603, United States
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3
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Sobie KM, Albritton M, Yang Y, Alves MM, Roitberg A, Grenning AJ. Construction of vicinal 4°/3°-carbons via reductive Cope rearrangement. Chem Sci 2022; 13:1951-1956. [PMID: 35308853 PMCID: PMC8848919 DOI: 10.1039/d1sc06307c] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2021] [Accepted: 01/20/2022] [Indexed: 11/21/2022] Open
Abstract
Herein reported is a strategy for constructing vicinal 4°/3° carbons via reductive Cope rearrangement. Substrates have been designed which exhibit Cope rearrangement kinetic barriers of ∼23 kcal mol−1 with isoenergetic favorability (ΔG ∼ 0). These fluxional/shape-shifting molecules can be driven forward by chemoselective reduction to useful polyfunctionalized building blocks. Herein reported is a strategy for constructing vicinal 4°/3° carbons via reductive Cope rearrangement.![]()
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Affiliation(s)
- Kristin M Sobie
- Department of Chemistry, University of Florida PO Box 117200 Gainesville FL 32611 USA
| | - Matthew Albritton
- Department of Chemistry, University of Florida PO Box 117200 Gainesville FL 32611 USA
| | - Yinuo Yang
- Department of Chemistry, University of Florida PO Box 117200 Gainesville FL 32611 USA
| | - Mariana M Alves
- Department of Chemistry, University of Florida PO Box 117200 Gainesville FL 32611 USA
| | - Adrian Roitberg
- Department of Chemistry, University of Florida PO Box 117200 Gainesville FL 32611 USA
| | - Alexander J Grenning
- Department of Chemistry, University of Florida PO Box 117200 Gainesville FL 32611 USA
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4
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Mannchen MD, Ghiviriga I, Abboud KA, Grenning AJ. 1,2,4-Trifunctionalized Cyclohexane Synthesis via a Diastereoselective Reductive Cope Rearrangement and Functional Group Interconversion Strategy. Org Lett 2021; 23:8804-8809. [PMID: 34719933 DOI: 10.1021/acs.orglett.1c03310] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Polyfunctionalized cyclohexanes are privileged scaffolds in drug discovery. Reported herein is a method for synthesizing 1,2,4-trifunctionalized cyclohexanes via diastereoselective reductive Cope rearrangement. The scaffolds obtained can be derivatized by orthogonal functional group interconversion to cyclohexanes bearing a 1-amide, 2-branched arylallyl, and variable 4-functional group.
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Affiliation(s)
- Michael D Mannchen
- Department of Chemistry, University of Florida, Gainesville, Florida 32603, United States
| | - Ion Ghiviriga
- Center for NMR Spectroscopy, Department of Chemistry, University of Florida, Gainesville, Florida 32603, United States
| | - Khalil A Abboud
- Center for X-ray Crystallography, Department of Chemistry, University of Florida, Gainesville, Florida 32603, United States
| | - Alexander J Grenning
- Department of Chemistry, University of Florida, Gainesville, Florida 32603, United States
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5
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Sanz-Vidal A, Gaviña D, Sotorríos L, Gómez-Bengoa E, López Ortiz F, Sánchez-Roselló M, Del Pozo C. Unexpected metal-free synthesis of trifluoromethyl arenes via tandem coupling of dicyanoalkenes and conjugated fluorinated sulfinyl imines. Chem Commun (Camb) 2021; 57:8023-8026. [PMID: 34291257 DOI: 10.1039/d1cc03161a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
A novel strategy for the synthesis of policyclic trifluoromethyl arenes has been devised. It involves a DBU-promoted tandem cycloaromatization reaction of dicyanoalkenes and fluorinated conjugated sulfinyl imines. This unprecedented transformation is a metal-free and air-tolerant process that takes place from readily available starting materials under mild reaction conditions.
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Affiliation(s)
- Alvaro Sanz-Vidal
- Department of Organic Chemistry, University of Valencia, Vicente Andrés Estellés s/n, 46100-Burjassot-Valencia, Spain.
| | - Daniel Gaviña
- Department of Organic Chemistry, University of Valencia, Vicente Andrés Estellés s/n, 46100-Burjassot-Valencia, Spain.
| | - Lia Sotorríos
- Department of Organic Chemistry I, University of Basque Country (UPV_EHU), Manuel de Lardizabal 3, 20018 Donostia-San Sebastián, Spain
| | - Enrique Gómez-Bengoa
- Department of Organic Chemistry I, University of Basque Country (UPV_EHU), Manuel de Lardizabal 3, 20018 Donostia-San Sebastián, Spain
| | - Fernando López Ortiz
- Área de Química Orgánica, Universidad de Almería, Carretera de Sacramento s/n, 04120 Almería, Spain
| | - María Sánchez-Roselló
- Department of Organic Chemistry, University of Valencia, Vicente Andrés Estellés s/n, 46100-Burjassot-Valencia, Spain.
| | - Carlos Del Pozo
- Department of Organic Chemistry, University of Valencia, Vicente Andrés Estellés s/n, 46100-Burjassot-Valencia, Spain.
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6
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Emmetiere F, Ratnayake R, Schares HAM, Jones KFM, Bevan-Smith E, Luesch H, Harki DA, Grenning AJ. Function-Oriented and Modular (+/-)-cis-Pseudoguaianolide Synthesis: Discovery of New Nrf2 Activators and NF-κB Inhibitors. Chemistry 2021; 27:5564-5571. [PMID: 33502811 DOI: 10.1002/chem.202100038] [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: 01/05/2021] [Revised: 01/21/2021] [Indexed: 12/26/2022]
Abstract
Described herein is a function-oriented synthesis route and biological evaluation of pseudoguaianolide analogues. The 10-step synthetic route developed retains the topological complexity of the natural product, installs functional handles for late-stage diversification, and forges the key bioactive Michael acceptors early in the synthesis. The analogues were found to be low-micromolar Nrf2 activators and micromolar NF-κB inhibitors and dependent on the local environment of the Michael acceptor moieties.
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Affiliation(s)
- Fabien Emmetiere
- Department of Chemistry, University of Florida, PO Box 117200, Gainesville, FL, 32608, USA
| | - Ranjala Ratnayake
- Department of Medicinal Chemistry and Center for Natural Products, Drug Discovery and Development (CNPD3), University of Florida, Gainesville, FL, 32610, USA
| | - Henry A M Schares
- Department of Medicinal Chemistry, University of Minnesota, Minneapolis, MN, 55455, USA
| | - Katherine F M Jones
- Department of Chemistry, University of Minnesota, Minneapolis, MN, 55455, USA
| | - Emily Bevan-Smith
- Department of Chemistry, University of Florida, PO Box 117200, Gainesville, FL, 32608, USA
| | - Hendrik Luesch
- Department of Medicinal Chemistry and Center for Natural Products, Drug Discovery and Development (CNPD3), University of Florida, Gainesville, FL, 32610, USA
| | - Daniel A Harki
- Department of Medicinal Chemistry, University of Minnesota, Minneapolis, MN, 55455, USA.,Department of Chemistry, University of Minnesota, Minneapolis, MN, 55455, USA
| | - Alexander J Grenning
- Department of Chemistry, University of Florida, PO Box 117200, Gainesville, FL, 32608, USA
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7
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Abstract
Reviewed herein is the aromatic Cope rearrangement, a Cope rearrangement where one (or both) of the alkenes of the 1,5-diene are part of a greater aromatic system. While the Cope rearrangement of 1,5-dienes has seen wide utility, variation, and application in chemical synthesis, the aromatic Cope rearrangement, comparatively, has not. This review summarizes the ∼40 papers dating back to 1956 on this topic and is divided into the following sections: (1) introduction, including kinetic and thermodynamic challenges of the aromatic Cope rearrangement, and (2) key substrate features, of which there are four general types: (i) α-allyl-α-aryl malonates (and related substrates), (ii) 1-aryl-2-vinylcyclopropanes, and (iii) anion-accelerated aromatic oxy-Cope substrates, and (iv) the concept of synchronized aromaticity. Ultimately, we hope this review will draw attention to a potentially valuable transformation for arene functionalization that warrants further studies and development.
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Affiliation(s)
- Breanna M Tomiczek
- Department of Chemistry, University of Florida, PO Box 117200, Gainesville, FL, USA.
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8
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Fereyduni E, Lahtigui O, Sanders JN, Tomiczek BM, Mannchen MD, Yu RA, Houk KN, Grenning AJ. Overcoming Kinetic and Thermodynamic Challenges of Classic Cope Rearrangements. J Org Chem 2021; 86:2632-2643. [PMID: 33476142 DOI: 10.1021/acs.joc.0c02690] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Systematic evaluation of 1,5-dienes bearing 3,3-electron-withdrawing groups and 4-methylation results in the discovery of a Cope rearrangement for Meldrum's acid-containing substrates that have unexpectedly favorable kinetic and thermodynamic profiles. The protocol is quite general due to a concise and convergent synthesis from abundant starting materials. Furthermore, products with an embedded Meldrum's acid moiety are prepared, which, in turn, can yield complex amides under neutral conditions. We have now expanded the scope of the reductive Cope rearrangement, which, via chemoselective reduction, can promote thermodynamically unfavorable [3,3] sigmatropic rearrangements of 3,3-dicyano-1,5-dienes to form reduced Cope rearrangement products. The Cope rearrangement is found to be stereospecific and can yield enantioenriched building blocks when chiral, nonracemic 1,3-disubstituted allylic electrophiles are utilized. We expand further the use of Cope rearrangements for the synthesis of highly valuable building blocks for complex- and drug-like molecular synthesis.
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Affiliation(s)
- Ehsan Fereyduni
- Department of Chemistry, University of Florida, P.O. Box 117200, Gainesville, Florida 32611, United States
| | - Ouidad Lahtigui
- Department of Chemistry, University of Florida, P.O. Box 117200, Gainesville, Florida 32611, United States
| | - Jacob N Sanders
- Department of Chemistry and Biochemistry, University of California, Los Angeles, California 90095, United States
| | - Breanna M Tomiczek
- Department of Chemistry, University of Florida, P.O. Box 117200, Gainesville, Florida 32611, United States
| | - Michael D Mannchen
- Department of Chemistry, University of Florida, P.O. Box 117200, Gainesville, Florida 32611, United States
| | - Roland A Yu
- Department of Chemistry and Biochemistry, University of California, Los Angeles, California 90095, United States
| | - K N Houk
- Department of Chemistry and Biochemistry, University of California, Los Angeles, California 90095, United States
| | - Alexander J Grenning
- Department of Chemistry, University of Florida, P.O. Box 117200, Gainesville, Florida 32611, United States
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9
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Semenova E, Lahtigui O, Scott SK, Albritton M, Abboud KA, Ghiviriga I, Roitberg AE, Grenning AJ. Selective ring-rearrangement or ring-closing metathesis of bicyclo[3.2.1]octenes. Chem Commun (Camb) 2020; 56:11779-11782. [PMID: 32940291 DOI: 10.1039/d0cc04624h] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Explored was the competitive ring-closing metathesis vs. ring-rearrangement metathesis of bicyclo[3.2.1]octenes prepared by a simple and convergent synthesis from bicyclic alkylidenemalono-nitriles and allylic electrophiles. It was uncovered that ring-closing metathesis occurs exclusively on the tetraene-variant, yielding unique, stereochemically and functionally rich polycyclic bridged frameworks, whereas the reduced version (a triene) undergoes ring-rearrangement metathesis to 5-6-5 fused ring systems resembling the isoryanodane core.
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Affiliation(s)
- Evgeniya Semenova
- Department of Chemistry, University of Florida, P. O. Box 117200, Gainesville, FL, USA.
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10
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Carvalho BBPDP, Amaral AAP, de Castro PP, Ferreira FCM, Horta BAC, Amarante GW. On the development of a nucleophilic methylthiolation methodology. Org Biomol Chem 2020; 18:5420-5426. [PMID: 32696795 DOI: 10.1039/d0ob01149e] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Methylthiolation reactions are usually explored to access organosulfur compounds using methanethiol, an extremely flammable and toxic compound. Herein, methylthiomethyl esters were successfully applied as novel methylthiolation reagents in a low cost, transition-metal-free methodology. These reagents allowed the methylthiolation of a wide scope of chalcones, acyl ester derivatives and Morita-Baylis-Hillman acetates with good group tolerance, affording the methylthiolated products in moderate to excellent yields. The reaction mechanism was investigated through several control experiments, as well as by theoretical calculations employing Density Functional Theory. The results strongly support that a sulfurane and a sulfonium ylide appear as key intermediates and that a Pummerer type rearrangement is also crucial for the formation of this novel reagent. Furthermore, the methylthiolation mechanism is likely to proceed through the nucleophilic attack of the reagent, followed by an entropically favoured step involving the acetate attack to the positively charged species, then releasing the product.
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Affiliation(s)
| | - Adriane Antonia Pereira Amaral
- Chemistry Department, Federal University of Juiz de Fora, Campus Martelos, Juiz de Fora, Minas Gerais Zip Code 36036-900, Brazil.
| | - Pedro Pôssa de Castro
- Chemistry Department, Federal University of Juiz de Fora, Campus Martelos, Juiz de Fora, Minas Gerais Zip Code 36036-900, Brazil.
| | | | - Bruno Araújo Cautiero Horta
- Chemistry Institute, Federal University of Rio de Janeiro, Cidade Universitária, CT Centro de Tecnologia, Rio de Janeiro, Zip Code 21941-909, Brazil
| | - Giovanni Wilson Amarante
- Chemistry Department, Federal University of Juiz de Fora, Campus Martelos, Juiz de Fora, Minas Gerais Zip Code 36036-900, Brazil.
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11
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Chen P, Li Y, Chen ZC, Du W, Chen YC. Pseudo-Stereodivergent Synthesis of Enantioenriched Tetrasubstituted Alkenes by Cascade 1,3-Oxo-Allylation/Cope Rearrangement. Angew Chem Int Ed Engl 2020; 59:7083-7088. [PMID: 32073203 DOI: 10.1002/anie.202000044] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2020] [Revised: 02/14/2020] [Indexed: 12/12/2022]
Abstract
The catalytic diastereodivergent construction of stereoisomers having two or more stereogenic centers has been extensively studied. In contrast, the switchable introduction of another stereogenic element, that is, Z/E configuration involving a polysubstituted alkene group, into the optically active stereoisomers, has not been recognized yet. Disclosed here is the pseudo-stereodivergent synthesis of highly enantioenriched tetrasubstituted alkene architectures from isatin-based Morita-Baylis-Hillman carbonates and allylic derivatives, under the cooperative catalysis of a tertiary amine and a chiral iridium complex. The success of the switchable construction of the tetrasubstituted alkene motif relies on the diastereodivergent 1,3-oxo-allylation reaction between N-allylic ylides and chiral π-allyliridium complex intermediates by ligand and substrate control, followed by the stereoselective concerted 3,3-Cope rearrangement process.
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Affiliation(s)
- Peng Chen
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Ministry of Education and Sichuan Research Center for Drug Precision Industrial Technology, West China School of Pharmacy, Sichuan University, Chengdu, 610041, China
| | - Yue Li
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Ministry of Education and Sichuan Research Center for Drug Precision Industrial Technology, West China School of Pharmacy, Sichuan University, Chengdu, 610041, China
| | - Zhi-Chao Chen
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Ministry of Education and Sichuan Research Center for Drug Precision Industrial Technology, West China School of Pharmacy, Sichuan University, Chengdu, 610041, China
| | - Wei Du
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Ministry of Education and Sichuan Research Center for Drug Precision Industrial Technology, West China School of Pharmacy, Sichuan University, Chengdu, 610041, China
| | - Ying-Chun Chen
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Ministry of Education and Sichuan Research Center for Drug Precision Industrial Technology, West China School of Pharmacy, Sichuan University, Chengdu, 610041, China.,College of Pharmacy, Third Military Medical University, Chongqing, 400038, China
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12
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Chen P, Li Y, Chen Z, Du W, Chen Y. Pseudo‐Stereodivergent Synthesis of Enantioenriched Tetrasubstituted Alkenes by Cascade 1,3‐Oxo‐Allylation/Cope Rearrangement. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202000044] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Affiliation(s)
- Peng Chen
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Ministry of Education and Sichuan Research Center for Drug Precision Industrial Technology West China School of Pharmacy Sichuan University Chengdu 610041 China
| | - Yue Li
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Ministry of Education and Sichuan Research Center for Drug Precision Industrial Technology West China School of Pharmacy Sichuan University Chengdu 610041 China
| | - Zhi‐Chao Chen
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Ministry of Education and Sichuan Research Center for Drug Precision Industrial Technology West China School of Pharmacy Sichuan University Chengdu 610041 China
| | - Wei Du
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Ministry of Education and Sichuan Research Center for Drug Precision Industrial Technology West China School of Pharmacy Sichuan University Chengdu 610041 China
| | - Ying‐Chun Chen
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Ministry of Education and Sichuan Research Center for Drug Precision Industrial Technology West China School of Pharmacy Sichuan University Chengdu 610041 China
- College of Pharmacy Third Military Medical University Chongqing 400038 China
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13
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Diastereoselective Synthesis of 2,3,4-Trisubstituted Tetrahydrofurans via Thermally Reactive 1,5-Diene- tert-butyl Carbonates. Org Lett 2020; 22:842-847. [PMID: 31951142 DOI: 10.1021/acs.orglett.9b04306] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
We report that 3,3-dicyano-1,5-dienes bearing tert-butyl carbonates can be thermally converted to 2,3,4-trisubstituted tetrahydrofurans. The transformation relies on two thermally reactive functional groups, a 1,5-diene and a tert-butyl carbonate, that react cooperatively to yield the furan scaffolds by thermal Cope rearrangement, Boc deprotection, and oxy-Michael addition. Described herein is background related to the discovery, optimization, and scope of the key transformation and representative functional group interconversion chemistry for the tetrahydrofuran scaffolds.
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14
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Herndon JW. The chemistry of the carbon-transition metal double and triple bond: Annual survey covering the year 2018. Coord Chem Rev 2019. [DOI: 10.1016/j.ccr.2019.213051] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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15
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Shen C, Wang RQ, Wei L, Wang ZF, Tao HY, Wang CJ. Catalytic Asymmetric Umpolung Allylation/2-Aza-Cope Rearrangement for the Construction of α-Tetrasubstituted α-Trifluoromethyl Homoallylic Amines. Org Lett 2019; 21:6940-6945. [DOI: 10.1021/acs.orglett.9b02543] [Citation(s) in RCA: 34] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Affiliation(s)
- Chong Shen
- Engineering Research Center of Organosilicon Compounds & Materials, Ministry of Education, College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, China
| | - Ruo-Qing Wang
- Engineering Research Center of Organosilicon Compounds & Materials, Ministry of Education, College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, China
| | - Liang Wei
- Engineering Research Center of Organosilicon Compounds & Materials, Ministry of Education, College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, China
| | - Zuo-Fei Wang
- Engineering Research Center of Organosilicon Compounds & Materials, Ministry of Education, College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, China
| | - Hai-Yan Tao
- Engineering Research Center of Organosilicon Compounds & Materials, Ministry of Education, College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, China
| | - Chun-Jiang Wang
- Engineering Research Center of Organosilicon Compounds & Materials, Ministry of Education, College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, China
- State Key Laboratory of Elemento-organic Chemistry, Nankai University, Tianjin 300071, China
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16
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Vertesaljai P, Serrano R, Mannchen MD, Williams M, Semenova E, Grenning AJ. Promoting Thermodynamically Unfavorable [3,3] Rearrangements by Chemoselective Reduction. Org Lett 2019; 21:5704-5707. [PMID: 31265314 DOI: 10.1021/acs.orglett.9b02057] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Herein described is a strategy for promoting thermodynamically unfavorable [3,3] Cope rearrangements. 3,3-Dicyano-1,5-dienes that are resistant to the thermal rearrangement can be promoted under reductive conditions. The reduced Cope products are versatile, bifunctional building blocks.
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Affiliation(s)
- Peter Vertesaljai
- Department of Chemistry , University of Florida , P.O. Box 117200, Gainesville , Florida 32611 , United States
| | - Roberto Serrano
- Department of Chemistry , University of Florida , P.O. Box 117200, Gainesville , Florida 32611 , United States
| | - Michael D Mannchen
- Department of Chemistry , University of Florida , P.O. Box 117200, Gainesville , Florida 32611 , United States
| | - Matthew Williams
- Department of Chemistry , University of Florida , P.O. Box 117200, Gainesville , Florida 32611 , United States
| | - Evgeniya Semenova
- Department of Chemistry , University of Florida , P.O. Box 117200, Gainesville , Florida 32611 , United States
| | - Alexander J Grenning
- Department of Chemistry , University of Florida , P.O. Box 117200, Gainesville , Florida 32611 , United States
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17
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Bai XD, Zhang QF, He Y. Enantioselective iridium catalyzed α-alkylation of azlactones by a tandem asymmetric allylic alkylation/aza-Cope rearrangement. Chem Commun (Camb) 2019; 55:5547-5550. [DOI: 10.1039/c9cc01450k] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
An enantioselective and regioselective α-alkylation of azlactones was developed by iridium catalysis using asymmetric allylic alkylation.
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Affiliation(s)
- Xue-Dan Bai
- School of Chemical Engineering
- Nanjing University of Science & Technology
- Nanjing
- China
| | - Qing-Feng Zhang
- School of Chemical Engineering
- Nanjing University of Science & Technology
- Nanjing
- China
| | - Ying He
- School of Chemical Engineering
- Nanjing University of Science & Technology
- Nanjing
- China
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