1
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Hernandez J, Lawrie AP, Frontier AJ. Alkynyl Halo-Aza-Prins Annulative Couplings. J Org Chem 2023; 88:16065-16075. [PMID: 37971946 PMCID: PMC10696554 DOI: 10.1021/acs.joc.3c01305] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2023] [Revised: 09/22/2023] [Accepted: 10/05/2023] [Indexed: 11/19/2023]
Abstract
This article is a comprehensive report describing our studies in the field of aza-alkynyl Prins chemistry, comparing and contrasting the different reaction partners and reactivities observed during method development. The synthetic strategies combine an alkynyl aza-Prins coupling with an annulation, enabling the preparation of different nitrogen-containing heterocycles. Different iminium ions are explored as viable electrophiles for an alkynyl Prins cyclization, terminated by capture with a halogen nucleophile to form a vinyl halide. The synthetic utility of this functional handle is exploited through a number of Suzuki cross-couplings, allowing for the preparation of a modest library of compounds. In most cases, the Prins couplings are highly selective for the vinyl halides with E geometry, resulting from anti-addition across the alkyne.
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Affiliation(s)
- Jackson
J. Hernandez
- Department of Chemistry, University
of Rochester, 120 Trustee Road, Rochester, New York 14611, United States
| | - Alexandra P. Lawrie
- Department of Chemistry, University
of Rochester, 120 Trustee Road, Rochester, New York 14611, United States
| | - Alison J. Frontier
- Department of Chemistry, University
of Rochester, 120 Trustee Road, Rochester, New York 14611, United States
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2
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Bora SK, Shit S, Sahu AK, Saikia AK. Diastereoselective Synthesis of 2,6-Disubstituted Tetrahydropyranones via Prins Cyclization of 3-Bromobut-3-en-1-ols and Aldehydes. J Org Chem 2023. [PMID: 36811615 DOI: 10.1021/acs.joc.2c02715] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/24/2023]
Abstract
Tetrahydropyranones are synthesized from 3-bromobut-3-en-1-ols and aldehydes in good yields with excellent diastereoselectivity at -35 °C. The reaction involves an initial formation of a most stable six-membered chairlike tetrahydropyranyl carbocation followed by nucleophilic attack of the hydroxyl group and subsequent elimination of HBr to give tetrahydropyranone. The carbonyl moiety of the tetrahydropyranone is converted to enol ether and esters using Wittig reaction. It is also transformed into 4-hydroxy-2,6-disubstituted tetrahydropyran with 2,4- and 4,6-cis configuration by lithium aluminum hydride in up to 96% diastereoselectivity. Furthermore, the methodology is extended toward the synthesis of novel anticancer aminoguanidine compounds.
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Affiliation(s)
- Surjya Kumar Bora
- Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati 781039, Assam, India
| | - Sudip Shit
- Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati 781039, Assam, India
| | - Archana Kumari Sahu
- Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati 781039, Assam, India
| | - Anil K Saikia
- Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati 781039, Assam, India
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3
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Kh. Faizullina L, Tagirov AR, Salikhov SM, Valeev FA. Ene reaction of Diels–Alder adducts of levoglucosenone and 1,3-dienes with acetaldehyde. MENDELEEV COMMUNICATIONS 2023. [DOI: 10.1016/j.mencom.2023.01.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/09/2023]
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4
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Biradar DO, Mane YD, Reddy BS, Yadav J. Stereoselective total syntheses of dodoneine and its diastereomer, epidodoneine via Prins cyclisation. Tetrahedron 2023. [DOI: 10.1016/j.tet.2022.133242] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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5
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Gharpure SJ, Pal J, Pansuriya KC. Leveraging Alkyne-Oximium Cyclization for the Stereoselective Synthesis of Isoxazolidine. Org Lett 2022; 24:8769-8773. [PMID: 36441517 DOI: 10.1021/acs.orglett.2c03483] [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
A TMSOTf-mediated highly diastereoselective synthesis of isoxazolidine bearing three contiguous stereocenters is described. This method utilizes O-propargyl hydroxylamines as a novel building block for the rapid assembly of the isoxazolidines via alkyne-oximium cyclization. The strategy could be used in the synthesis of enantiomerically enriched isoxazolidines. Reductive cleavage of the N-O bond efficiently gives the corresponding 1,3-aminodiols with precise control over all stereocenters formed.
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Affiliation(s)
- Santosh J Gharpure
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai-400076, India
| | - Juhi Pal
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai-400076, India
| | - Kaushik C Pansuriya
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai-400076, India
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6
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Biradar DO, Mane YD, Narsaiah A, Subba Reddy B. First Diastereoselective Total Synthesis of Bicyclic Styryl Lactone: (1R,5R,7R)-7-((E)-styryl)-2,6-dioxabicyclo[3.3.1]nonan-3-one. RESULTS IN CHEMISTRY 2022. [DOI: 10.1016/j.rechem.2022.100717] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
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7
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Hernandez JJ, Frontier AJ. Alkynyl Prins carbocyclization cascades for the synthesis of linear-fused heterocyclic ring systems. Chem Sci 2022; 13:13836-13842. [PMID: 36544720 PMCID: PMC9710218 DOI: 10.1039/d2sc04750k] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2022] [Accepted: 11/04/2022] [Indexed: 11/12/2022] Open
Abstract
We report a Brønsted acid-catalyzed carbocyclization cascade, featuring condensation of an alcohol/sulfonamide with an aldehyde followed by an intramolecular three-component coupling involving an alkyne, an oxocarbenium/iminium ion, and an arene. A formal cycloaddition is embedded in the cationic cascade, which enables the synthesis of a wide range of fused heterotricycles. The diastereoselectivity of the cascade is studied using secondary alcohols/sulfonamides with different carbonyl partners. The described method results in the preparation of synthetically versatile scaffolds with ample opportunity for further derivatization at the resulting tetrasubstituted olefin, or by inclusion of other functionalizable motifs from the starting materials. It is worth noting that this chemistry also facilitates the synthesis of piperidines and 1,4-oxazepanes, as well as the inclusion of indoles and benzofurans, which are privileged motifs for medicinal chemistry. Herein we present the generality of this approach and some chemical transformations that can be achieved with our substrates.
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Affiliation(s)
- Jackson J. Hernandez
- Department of Chemistry, University of Rochester120 Trustee RoadRochesterNew York 14611USA
| | - Alison J. Frontier
- Department of Chemistry, University of Rochester120 Trustee RoadRochesterNew York 14611USA
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8
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Khan SS, Sudasinghe TD, Landgraf AD, Ronning DR, Sucheck SJ. Total Synthesis of Tetrahydrolipstatin, Its Derivatives, and Evaluation of Their Ability to Potentiate Multiple Antibiotic Classes against Mycobacterium Species. ACS Infect Dis 2021; 7:2876-2888. [PMID: 34478259 PMCID: PMC8630808 DOI: 10.1021/acsinfecdis.1c00283] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Tetrahydrolipstatin (THL, 1a) has been shown to inhibit both mammalian and bacterial α/β hydrolases. In the case of bacterial systems, THL is a known inhibitor of several Mycobacterium tuberculosis hydrolases involved in mycomembrane biosynthesis. Herein we report a highly efficient eight-step asymmetric synthesis of THL using a route that allows modification of the THL α-chain substituent to afford compounds 1a through 1e. The key transformation in the synthesis was use of a (TPP)CrCl/Co2(CO)8-catalyzed regioselective and stereospecific carbonylation on an advanced epoxide intermediate to yield a trans-β-lactone. These compounds are modest inhibitors of Ag85A and Ag85C, two α/β hydrolases of M. tuberculosis involved in the biosynthesis of the mycomembrane. Among these compounds, 10d showed the highest inhibitory effect on Ag85A (34 ± 22 μM) and Ag85C (66 ± 8 μM), and its X-ray structure was solved in complex with Ag85C to 2.5 Å resolution. In contrast, compound 1e exhibited the best-in-class MICs of 50 μM (25 μg/mL) and 16 μM (8.4 μg/mL) against M. smegmatis and M. tuberculosis H37Ra, respectively, using a microtiter assay plate. Combination of 1e with 13 well-established antibiotics synergistically enhanced the potency of few of these antibiotics in M. smegmatis and M. tuberculosis H37Ra. Compound 1e applied at concentrations 4-fold lower than its MIC enhanced the MIC of the synergistic antibiotic by 2-256-fold. In addition to observing synergy with first-line drugs, rifamycin and isoniazid, the MIC of vancomycin against M. tuberculosis H37Ra was 65 μg/mL; however, the MIC was lowered to 0.25 μg/mL in the presence of 2.1 μg/mL 1e demonstrating the potential of targeting mycobacterial hydrolases involved in mycomembrane and peptidoglycan biosynthesis.
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Affiliation(s)
- Saniya S Khan
- Department of Chemistry & Biochemistry, University of Toledo, Toledo, Ohio 43606, United States
| | - Thanuja D Sudasinghe
- Department of Pharmaceutical Sciences, University of Nebraska Medical Center, Omaha, Nebraska 68198, United States
| | - Alexander D Landgraf
- Department of Chemistry & Biochemistry, University of Toledo, Toledo, Ohio 43606, United States
| | - Donald R Ronning
- Department of Pharmaceutical Sciences, University of Nebraska Medical Center, Omaha, Nebraska 68198, United States
| | - Steven J Sucheck
- Department of Chemistry & Biochemistry, University of Toledo, Toledo, Ohio 43606, United States
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9
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Budakoti A, Mondal PK, Verma P, Khamrai J. Prins cyclization-mediated stereoselective synthesis of tetrahydropyrans and dihydropyrans: an inspection of twenty years. Beilstein J Org Chem 2021; 17:932-963. [PMID: 33981366 PMCID: PMC8093554 DOI: 10.3762/bjoc.17.77] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2021] [Accepted: 04/14/2021] [Indexed: 11/25/2022] Open
Abstract
Functionalized tetrahydropyran (THP) rings are important building blocks and ubiquitous scaffolds in many natural products and active pharmaceutical ingredients (API). Among various established methods, the Prins reaction has emerged as a powerful technique in the stereoselective synthesis of the tetrahydropyran skeleton with various substituents, and the strategy has further been successfully applied in the total synthesis of bioactive macrocycles and related natural products. In this context, hundreds of valuable contributions have already been made in this area, and the present review is intended to provide the systematic assortment of diverse Prins cyclization strategies, covering the literature reports of the last twenty years (from 2000 to 2019), with an aim to give an overview on exciting advancements in this area and designing new strategies for the total synthesis of related natural products.
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Affiliation(s)
- Asha Budakoti
- Division of Molecular Synthesis & Drug Discovery, Centre of Biomedical Research (CBMR), SGPGIMS Campus Raebareli Road, Lucknow, 226014 Uttar Pradesh, India
| | - Pradip Kumar Mondal
- Division of Molecular Synthesis & Drug Discovery, Centre of Biomedical Research (CBMR), SGPGIMS Campus Raebareli Road, Lucknow, 226014 Uttar Pradesh, India
| | - Prachi Verma
- Division of Molecular Synthesis & Drug Discovery, Centre of Biomedical Research (CBMR), SGPGIMS Campus Raebareli Road, Lucknow, 226014 Uttar Pradesh, India
| | - Jagadish Khamrai
- Division of Molecular Synthesis & Drug Discovery, Centre of Biomedical Research (CBMR), SGPGIMS Campus Raebareli Road, Lucknow, 226014 Uttar Pradesh, India
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10
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Roy S. Prins-Friedel-Crafts Cyclization: Synthesis of Diversely Functionalized Six- Membered Oxacycles. CURR ORG CHEM 2021. [DOI: 10.2174/1385272825666210114105020] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Prins cyclization is a well-established synthetic protocol to generate a wide range
of important oxygen heterocycles. It is a cyclization reaction performed by an oxocarbenium
ion that undergoes an intramolecular pi-bond attack to construct a new carbon-carbon bond.
When this cyclization process is conjugated with Friedel-Crafts reaction, it further expands
the synthetic potential by fabricating two different carbon-carbon bonds in one single reaction.
Different acid catalysts mediated the coupled Prins-Friedel-Crafts reaction which is conducted
both in stepwise as well as in tandem fashion. In the stepwise route, three different
reacting components were utilized whereas, the tandem methodology required proper modification
of the initial substrate molecule. An array of allylic, propargylic, other related alkenols,
and carbonyl reactants were employed to carry out the cyclization process. Several oxygenated
heterocycles equipped with diverse functionalities were constructed in a stereoselective manner which again
reinforced the significance of this cyclization protocol undoubtedly. The present mini-review highlights the utilization
of different one-pot stepwise Prins-Friedel-Crafts reactions and the subsequent development of cascade Prins-
Friedel-Crafts cyclization process to furnish intricate molecular architectures of vital six-membered oxacycles.
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Affiliation(s)
- Snigdha Roy
- Department of Chemistry, Banwarilal Bhalotia College, Asansol-713303, West Bengal, India
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11
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Bai J, Chen B, Zhang G. Enantioselective Synthesis of
cis
‐2,
6‐Disubstituted
‐4‐methylene Tetrahydropyrans via Chromium Catalysis
†. CHINESE J CHEM 2020. [DOI: 10.1002/cjoc.202000296] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Jing Bai
- State Key Laboratory of Organometallic Chemistry, Center for Excellence in Molecular Synthesis, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Chinese Academy of Sciences 345 Lingling Road Shanghai 200032 China
| | - Bin Chen
- State Key Laboratory of Organometallic Chemistry, Center for Excellence in Molecular Synthesis, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Chinese Academy of Sciences 345 Lingling Road Shanghai 200032 China
| | - Guozhu Zhang
- State Key Laboratory of Organometallic Chemistry, Center for Excellence in Molecular Synthesis, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Chinese Academy of Sciences 345 Lingling Road Shanghai 200032 China
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12
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Abdul-Rashed S, Alachouzos G, Brennessel WW, Frontier AJ. One-Pot Double-Annulation Strategy for the Synthesis of Unusual Fused Bis-Heterocycles. Org Lett 2020; 22:4350-4354. [PMID: 32412769 DOI: 10.1021/acs.orglett.0c01351] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
A novel metal-free double-annulation cascade for the construction of unusual fused heterocyclic systems is described. This simple protocol enables the sequential assembly of two rings in one pot from two simple precursors. Acidic conditions promote the condensation and the intramolecular alkynyl Prins reaction of an enyne or arenyne alcohol with a cyclic hemiaminal to form a five-, six-, or seven-membered oxacycle followed by a seven- or eight-membered azacycle. In this transformation, chemical complexity is rapidly generated with the formation of three new bonds (one C-O, one C-C, and one C-N) in one synthetic operation. The strategy is modular and relatively general, providing access to a series of unique fused bicyclic scaffolds.
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Affiliation(s)
- Shukree Abdul-Rashed
- Department of Chemistry, University of Rochester, 414 Hutchison Hall, 100 Trustee Road, Rochester, New York 14627, United States
| | - Georgios Alachouzos
- Department of Chemistry, University of Rochester, 414 Hutchison Hall, 100 Trustee Road, Rochester, New York 14627, United States
| | - William W Brennessel
- Department of Chemistry, University of Rochester, 414 Hutchison Hall, 100 Trustee Road, Rochester, New York 14627, United States
| | - Alison J Frontier
- Department of Chemistry, University of Rochester, 414 Hutchison Hall, 100 Trustee Road, Rochester, New York 14627, United States
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13
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Alachouzos G, Holt C, Frontier AJ. Stereochemical Relay through a Cationic Intermediate: Helical Preorganization Dictates Direction of Conrotation in the halo-Nazarov Cyclization. Org Lett 2020; 22:4010-4015. [PMID: 32352794 DOI: 10.1021/acs.orglett.0c01330] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A stereocontrolled halo-Prins/halo-Nazarov cyclization protocol is reported, where chiral information from a secondary alcohol is relayed through several intermediates yielding halocyclopentene products diastereoselectively. An enantiopure product is obtained when a nonracemic secondary alcohol is used. Experimental and computational studies are described, enabling the design and synthesis of systems that ionize and cyclize with >95% chirality transfer through a mechanism involving the creation and preservation of transient helical chirality in a pentadienyl cation intermediate. First, a diastereoselective alkynyl Prins cyclization is executed to synthesize a conformationally distorted dihydropyran intermediate with a curved backbone and high reactivity. This chiral precursor adopts a specific helical alignment early in the subsequent cationic ionization/halo-Nazarov cyclization process, dictating the direction of conrotation in the electrocyclization. Notably, despite the ablation of an sp3 stereogenic center during ionization, the low halo-Nazarov barrier enables efficient capture of a cationic intermediate with dynamic conformational chirality. The ionization and electrocyclization thus occur with "memory of chirality".
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Affiliation(s)
- Georgios Alachouzos
- Department of Chemistry, University of Rochester, 414 Hutchison Hall, 100 Trustee Road, Rochester, New York 14627-0216, United States
| | - Connor Holt
- Department of Chemistry, University of Rochester, 414 Hutchison Hall, 100 Trustee Road, Rochester, New York 14627-0216, United States
| | - Alison J Frontier
- Department of Chemistry, University of Rochester, 414 Hutchison Hall, 100 Trustee Road, Rochester, New York 14627-0216, United States
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14
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Lu Z, Bajwa BS, Okoromoba OE, Hammond GB, Xu B. Multifaceted Ion Exchange Resin-Supported Hydrogen Fluoride: A Path to Flow Hydrofluorination. GREEN CHEMISTRY : AN INTERNATIONAL JOURNAL AND GREEN CHEMISTRY RESOURCE : GC 2019; 21:2224-2228. [PMID: 31402845 PMCID: PMC6688644 DOI: 10.1039/c8gc03166e] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
A solid anhydrous hydrogen fluoride equivalent was prepared by mixing HF gas with an inexpensive anion exchange resin (A26-HF, HF content 30% wt/wt).
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Affiliation(s)
- Zhichao Lu
- Dr. Z. Lu, Dr. O. E. Okoromoba, Prof. Gerald B. Hammond, Department of Chemistry, University of Louisville, Louisville, Kentucky 40292, USA
| | - Bhvandip S. Bajwa
- Mr. B. S. Bajwa Department of Chemistry, California State University, Fresno, California 93740, USA
| | - Otome E. Okoromoba
- Dr. Z. Lu, Dr. O. E. Okoromoba, Prof. Gerald B. Hammond, Department of Chemistry, University of Louisville, Louisville, Kentucky 40292, USA
| | - Gerald B. Hammond
- Dr. Z. Lu, Dr. O. E. Okoromoba, Prof. Gerald B. Hammond, Department of Chemistry, University of Louisville, Louisville, Kentucky 40292, USA
| | - Bo Xu
- Prof. Bo Xu, Key Laboratory of Science and Technology of Eco-Textiles, Ministry of Education, College of Chemistry, Chemical Engineering and Biotechnology, Donghua University, Shanghai 201620, China
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15
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Segovia C, Fache F, Pelotier B, Piva O. Access to Polyfluorinated Tetrahydropyranyl Amides via Prins‐Ritter Cyclization under Green Conditions. ChemistrySelect 2019. [DOI: 10.1002/slct.201900110] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Claire Segovia
- Université de Lyon, Université Claude Bernard Lyon 1, CNRS – INSA Lyon – CPE Lyon, ICBMS UMR 5246Institut de Chimie et Biochimie Moléculaires et Supramoléculaires, Equipe SURCOOF, Bât. Raulin, 43 Bd du 11 Novembre 1918 69622 Villeurbanne Cedex France
| | - Fabienne Fache
- Université de Lyon, Université Claude Bernard Lyon 1, CNRS – INSA Lyon – CPE Lyon, ICBMS UMR 5246Institut de Chimie et Biochimie Moléculaires et Supramoléculaires, Equipe SURCOOF, Bât. Raulin, 43 Bd du 11 Novembre 1918 69622 Villeurbanne Cedex France
| | - Béatrice Pelotier
- Université de Lyon, Université Claude Bernard Lyon 1, CNRS – INSA Lyon – CPE Lyon, ICBMS UMR 5246Institut de Chimie et Biochimie Moléculaires et Supramoléculaires, Equipe SURCOOF, Bât. Raulin, 43 Bd du 11 Novembre 1918 69622 Villeurbanne Cedex France
| | - Olivier Piva
- Université de Lyon, Université Claude Bernard Lyon 1, CNRS – INSA Lyon – CPE Lyon, ICBMS UMR 5246Institut de Chimie et Biochimie Moléculaires et Supramoléculaires, Equipe SURCOOF, Bât. Raulin, 43 Bd du 11 Novembre 1918 69622 Villeurbanne Cedex France
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16
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Yamini V, Reddy KM, Krishna AS, Lakshmi JK, Ghosh S. Formal total synthesis of mandelalide A. J CHEM SCI 2019. [DOI: 10.1007/s12039-019-1600-2] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
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17
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Sun P, Xian Y, Xiao Y. GaI3 Catalysed Nucleophilic Addition of Allyltrimethylsilane to Aldehydes. JOURNAL OF CHEMICAL RESEARCH 2019. [DOI: 10.3184/0308234041640627] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
In dichloromethane, the nucleophilic addition of allyltrimethylsilane to aldehydes to give the corresponding homoallyl alcohols in good to excellent yields was catalysed effectively by gallium triiodide which was generated in situ by the reaction of gallium metal and iodine.
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Affiliation(s)
- Peipei Sun
- School of Chemistry and Environmental Science, Nanjing Normal University, Nanjing, 210097, P. R. China
| | - Yufang Xian
- School of Chemistry and Environmental Science, Nanjing Normal University, Nanjing, 210097, P. R. China
| | - Yaping Xiao
- School of Chemistry and Environmental Science, Nanjing Normal University, Nanjing, 210097, P. R. China
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18
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Kato M, Saito A. Domino Synthesis of 2,3-Dialkylidenetetrahydrofurans via Tandem Prins Cyclization-Skeletal Reorganization. Org Lett 2018; 20:4709-4712. [PMID: 30044103 DOI: 10.1021/acs.orglett.8b02114] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
A domino synthesis of 2,3-dialkylidenetetrahydrofurans based on Prins-type cyclization of 3,5-diynols and aldehydes is described. In the present reaction, skeletal reorganization of the Prins-cyclized intermediates proceeds via a ring-opening reaction followed by intramolecular (hemi)acetalization of the resulting 4-en-1-yn-3-ones. Furthermore, a representative product undergoes a Diels-Alder reaction with dimethyl acetylenedicarboxylate (DMAD) to afford a highly substituted 2,3-dihydrobenzofuran.
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Affiliation(s)
- Mizuki Kato
- Division of Applied Chemistry, Institute of Engineering , Tokyo University of Agriculture and Technology , 2-24-16 Naka-cho , Koganei , Tokyo 184-8588 , Japan
| | - Akio Saito
- Division of Applied Chemistry, Institute of Engineering , Tokyo University of Agriculture and Technology , 2-24-16 Naka-cho , Koganei , Tokyo 184-8588 , Japan
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19
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Abstract
The synthesis of kibdelone C, a polycyclic natural xanthone isolated from a soil actinomycete, was achieved through a convergent approach. A 6π-electrocyclization was applied to construct the highly substituted dihydrophenanthrenol fragment (B-C-D ring). InBr3-promoted lactonization was employed to build the isocoumarin ring, which served as a common precursor for the formation of isoquinolinone ring (A-B ring). A key DMAP-mediated oxa-Michael/aldol cascade reaction was developed to install the tetrahydroxanthone fragment (E-F ring). This approach provides a new solution to prepare its derivatives and structurally related natural products.
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Affiliation(s)
- Yihua Dai
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes , School of Chemistry and Molecular Engineering, East China Normal University , Shanghai 200062 , China
| | - Feixia Ma
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes , School of Chemistry and Molecular Engineering, East China Normal University , Shanghai 200062 , China
| | - Yanfang Shen
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes , School of Chemistry and Molecular Engineering, East China Normal University , Shanghai 200062 , China
| | - Tao Xie
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes , School of Chemistry and Molecular Engineering, East China Normal University , Shanghai 200062 , China
| | - Shuanhu Gao
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes , School of Chemistry and Molecular Engineering, East China Normal University , Shanghai 200062 , China.,Shanghai Engineering Research Center of Molecular Therapeutics and New Drug Development , East China Normal University , Shanghai 200062 , China
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20
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Gandhamsetty N, Jee S, Chang S. Diastereoselective Construction of α-Silyltetrahydropyranols through Silyl-Oxa-Prins Cyclization. European J Org Chem 2017. [DOI: 10.1002/ejoc.201601631] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Narasimhulu Gandhamsetty
- Center for Catalytic Hydrocarbon Functionalizations; Institute of Basic Science (IBS); 305-701 Daejeon Korea
- Department of Chemistry; Korea Advanced Institute of Science and Technology (KAIST); 305-701 Daejeon Korea
| | - Soyeon Jee
- Center for Catalytic Hydrocarbon Functionalizations; Institute of Basic Science (IBS); 305-701 Daejeon Korea
- Department of Chemistry; Korea Advanced Institute of Science and Technology (KAIST); 305-701 Daejeon Korea
| | - Sukbok Chang
- Center for Catalytic Hydrocarbon Functionalizations; Institute of Basic Science (IBS); 305-701 Daejeon Korea
- Department of Chemistry; Korea Advanced Institute of Science and Technology (KAIST); 305-701 Daejeon Korea
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21
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Hinkle RJ, Chen Y, Nofi CP, Lewis SE. Electronic effects on a one-pot aromatization cascade involving alkynyl-Prins cyclization, Friedel–Crafts alkylation and dehydration to tricyclic benzo[f]isochromenes. Org Biomol Chem 2017; 15:7584-7593. [DOI: 10.1039/c7ob01412k] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A short, efficient cyclization/aromatization cascade affords tricyclic 1,4-dihydro-2H-benzo[f]isochromenes. Electronic factors suggest concerted alkynyl-Prins and Friedel–Crafts reactions in the sequence.
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Affiliation(s)
- Robert J. Hinkle
- Department of Chemistry
- The College of William & Mary
- Williamsburg
- USA
| | - Yuzhou Chen
- Department of Chemistry
- The College of William & Mary
- Williamsburg
- USA
| | - Colleen P. Nofi
- Department of Chemistry
- The College of William & Mary
- Williamsburg
- USA
| | - Shane E. Lewis
- Department of Chemistry
- The College of William & Mary
- Williamsburg
- USA
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22
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Li H, Chen Q, Lu Z, Li A. Total Syntheses of Aflavazole and 14-Hydroxyaflavinine. J Am Chem Soc 2016; 138:15555-15558. [DOI: 10.1021/jacs.6b10880] [Citation(s) in RCA: 53] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Hailong Li
- State Key Laboratory of Bioorganic
and Natural Products Chemistry, Collaborative Innovation Center of
Chemistry for Life Sciences, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032, China
| | - Qifeng Chen
- State Key Laboratory of Bioorganic
and Natural Products Chemistry, Collaborative Innovation Center of
Chemistry for Life Sciences, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032, China
| | - Zhaohong Lu
- State Key Laboratory of Bioorganic
and Natural Products Chemistry, Collaborative Innovation Center of
Chemistry for Life Sciences, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032, China
| | - Ang Li
- State Key Laboratory of Bioorganic
and Natural Products Chemistry, Collaborative Innovation Center of
Chemistry for Life Sciences, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032, China
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23
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Kantee K, Rukachaisirikul V, Tadpetch K. Synthesis of tetrahydropyranyl diarylheptanoids from Dioscorea villosa. Tetrahedron Lett 2016. [DOI: 10.1016/j.tetlet.2016.06.102] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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24
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Beattie RJ, Hornsby TW, Craig G, Galan MC, Willis CL. Stereoselective synthesis of protected l- and d-dideoxysugars and analogues via Prins cyclisations. Chem Sci 2016; 7:2743-2747. [PMID: 28660050 PMCID: PMC5477037 DOI: 10.1039/c5sc04144a] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2015] [Accepted: 01/08/2016] [Indexed: 11/21/2022] Open
Abstract
A de novo approach for the rapid construction of orthogonally protected l- and d-deoxysugars and analogues is described. A novel and robust silicon-acetal undergoes Prins cyclisations with a series of homoallylic alcohols in high yield and excellent stereocontrol. Modified Tamao-Fleming oxidation of the resulting silyltetrahydropyrans gives direct access to deoxyglycoside analogues and the approach was showcased in the synthesis of protected l-oliose, a component of the anticancer agent aclacinomycin A.
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Affiliation(s)
- Ryan J Beattie
- School of Chemistry , University of Bristol , Cantock's Close , Bristol BS8 1TS , UK . ;
| | - Thomas W Hornsby
- School of Chemistry , University of Bristol , Cantock's Close , Bristol BS8 1TS , UK . ;
| | - Gemma Craig
- School of Chemistry , University of Bristol , Cantock's Close , Bristol BS8 1TS , UK . ;
| | - M Carmen Galan
- School of Chemistry , University of Bristol , Cantock's Close , Bristol BS8 1TS , UK . ;
| | - Christine L Willis
- School of Chemistry , University of Bristol , Cantock's Close , Bristol BS8 1TS , UK . ;
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25
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Álvarez-Méndez SJ, García C, Martín VS. The Evans Aldol–Prins cyclization: a general and stereoselective method for the synthesis of 2,3,4,5,6-pentasubstituted tetrahydropyrans. Chem Commun (Camb) 2016; 52:3380-3. [PMID: 26878814 DOI: 10.1039/c6cc00160b] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A method for the synthesis of 2,3,4,5,6-pentasubstituted THPs with good yields and diastereoselectivities through an Evans Aldol–Prins strategy is described.
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Affiliation(s)
- Sergio J. Álvarez-Méndez
- Instituto Universitario de Bio-Orgánica “Antonio González” (IUBO-AG)
- Centro de Investigaciones Biomédicas de Canarias (CIBICAN)
- Departamento de Química Orgánica
- Universidad de La Laguna
- 38206 La Laguna
| | - Celina García
- Instituto Universitario de Bio-Orgánica “Antonio González” (IUBO-AG)
- Centro de Investigaciones Biomédicas de Canarias (CIBICAN)
- Departamento de Química Orgánica
- Universidad de La Laguna
- 38206 La Laguna
| | - Víctor S. Martín
- Instituto Universitario de Bio-Orgánica “Antonio González” (IUBO-AG)
- Centro de Investigaciones Biomédicas de Canarias (CIBICAN)
- Departamento de Química Orgánica
- Universidad de La Laguna
- 38206 La Laguna
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26
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Islam MM, Akther T, Ikejiri Y, Matsumoto T, Tanaka J, Rahman S, Georghiou PE, Hughes DL, Redshaw C, Yamato T. Synthesis, structural properties, electrophilic substitution reactions and DFT computational studies of calix[3]benzofurans. RSC Adv 2016. [DOI: 10.1039/c6ra06219a] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023] Open
Abstract
Synthesis of highly flexible calix[3]benzofurans; effects of substituent groups on calix[3]benzofuran conformations were studied by DFT computational methods.
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Affiliation(s)
- Md. Monarul Islam
- Department of Applied Chemistry
- Faculty of Science and Engineering
- Saga University
- Saga-shi
- Japan
| | - Thamina Akther
- Department of Applied Chemistry
- Faculty of Science and Engineering
- Saga University
- Saga-shi
- Japan
| | - Yusuke Ikejiri
- Department of Applied Chemistry
- Faculty of Science and Engineering
- Saga University
- Saga-shi
- Japan
| | - Taisuke Matsumoto
- Institute for Materials Chemistry and Engineering
- Kyushu University
- Kasuga 816-8580
- Japan
| | - Junji Tanaka
- Institute for Materials Chemistry and Engineering
- Kyushu University
- Kasuga 816-8580
- Japan
| | - Shofiur Rahman
- Department of Chemistry
- Memorial University of Newfoundland
- St. John's
- Canada
| | - Paris E. Georghiou
- Department of Chemistry
- Memorial University of Newfoundland
- St. John's
- Canada
| | | | - Carl Redshaw
- Department of Chemistry
- The University of Hull
- Hull
- UK
| | - Takehiko Yamato
- Department of Applied Chemistry
- Faculty of Science and Engineering
- Saga University
- Saga-shi
- Japan
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27
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Chalopin T, Jebali K, Gaulon-Nourry C, Dénès F, Lebreton J, Mathé-Allainmat M. Regioselective dihydropyran formation from 4-iodo-2,6-disubstituted tetrahydropyran derivatives using In(OAc)3/LiI system as the promoter. Tetrahedron 2016. [DOI: 10.1016/j.tet.2015.11.046] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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28
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Okoromoba OE, Hammond GB, Xu B. Preparation of Fluorinated Tetrahydropyrans and Piperidines using a New Nucleophilic Fluorination Reagent DMPU/HF. Org Lett 2015; 17:3975-7. [PMID: 26262944 DOI: 10.1021/acs.orglett.5b01919] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
DMPU/HF (HF content 65 wt %/wt) is an ideal nucleophilic fluorination reagent for the diastereoselective synthesis of substituted 4-fluorotetrahydropyrans and 4-fluoropiperidines via a fluoro-Prins reaction. When compared to classical nucleophilic fluorination reagents like pyridine/HF, DMPU/HF gives both higher yields and better diastereoselectivity.
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Affiliation(s)
- Otome E Okoromoba
- †Department of Chemistry, University of Louisville, Louisville, Kentucky 40292, United States
| | - Gerald B Hammond
- †Department of Chemistry, University of Louisville, Louisville, Kentucky 40292, United States
| | - Bo Xu
- ‡College of Chemistry, Chemical Engineering and Biotechnology, Donghua University, 2999 North Renmin Lu, Shanghai 201620, China
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29
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Zou Y, Zhou L, Ding C, Wang Q, Kraft P, Goeke A. A novel oxy-oxonia(azonia)-cope reaction: serendipitous discovery and its application to the synthesis of macrocyclic musks. Chem Biodivers 2015; 11:1608-28. [PMID: 25329787 DOI: 10.1002/cbdv.201400058] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2014] [Indexed: 11/11/2022]
Abstract
This brief review, including new experimental results, is the summary of a talk at the GDCh conference 'flavors & fragrances 2013' in Leipzig, Germany, 11th-13th September, 2013. Musk odorants are indispensable in perfumery to lend sensuality to fine fragrances, a nourishing effect to cosmetics, and a comforting feeling to laundry. We have recently found serendipitously a new oxy-oxonia-Cope rearrangement. In this account, we review the background of oxonia-sigmatropic rearrangements and the discovery of this novel reaction. Special attention is focused on the versatile lactone and lactam formation reactions via [n+4] ring enlargement and the macrocyclization in the synthesis of new macrocyclic musks. The synthesized structures provide new insights into the structure-odor relationships of musks.
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Affiliation(s)
- Yue Zou
- Givaudan Fragrances (Shanghai) Ltd., Li Shi Zhen Road 298, Shanghai 201203, P. R. China.
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30
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Tsui GC, Liu L, List B. Die organokatalytische asymmetrische Prins-Cyclisierung. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201500219] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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31
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Tsui GC, Liu L, List B. The Organocatalytic Asymmetric Prins Cyclization. Angew Chem Int Ed Engl 2015; 54:7703-6. [DOI: 10.1002/anie.201500219] [Citation(s) in RCA: 130] [Impact Index Per Article: 14.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2015] [Revised: 03/25/2015] [Indexed: 01/25/2023]
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32
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Damera K, Yu B, Wang B. Stereoselective Synthesis of 1-Methyl-3′,4′,5′,6′-tetrahydrospiro[indoline-3,2′-pyran]-2-one Derivatives via Prins Cyclization. J Org Chem 2015; 80:5457-63. [DOI: 10.1021/acs.joc.5b00249] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Krishna Damera
- Department of Chemistry and
Center for Diagnostics and Therapeutics, Georgia State University, Atlanta, Georgia 30303, United States
| | - Bingchen Yu
- Department of Chemistry and
Center for Diagnostics and Therapeutics, Georgia State University, Atlanta, Georgia 30303, United States
| | - Binghe Wang
- Department of Chemistry and
Center for Diagnostics and Therapeutics, Georgia State University, Atlanta, Georgia 30303, United States
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33
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Yadav J, Rahman MA, Reddy NM, Prasad A. Synthesis of spiroketal fragment of ossamycin via Prins cyclization. Tetrahedron Lett 2015. [DOI: 10.1016/j.tetlet.2014.11.097] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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34
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Gogoi P, Das VK, Saikia AK. Diastereoselective Synthesis of Substituted Tetrahydrofurans via Prins Cyclization of Enol Ethers. J Org Chem 2014; 79:8592-8. [DOI: 10.1021/jo501197y] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Paramartha Gogoi
- Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati 781039, India
| | - Vijay K. Das
- Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati 781039, India
| | - Anil K. Saikia
- Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati 781039, India
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35
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Cresswell AJ, Davies SG, Roberts PM, Thomson JE. Beyond the Balz-Schiemann reaction: the utility of tetrafluoroborates and boron trifluoride as nucleophilic fluoride sources. Chem Rev 2014; 115:566-611. [PMID: 25084541 DOI: 10.1021/cr5001805] [Citation(s) in RCA: 127] [Impact Index Per Article: 12.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Affiliation(s)
- Alexander J Cresswell
- Department of Chemistry, Chemistry Research Laboratory, University of Oxford , Mansfield Road, Oxford OX1 3TA, United Kingdom
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36
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Yadav JS, Reddy NM, Rahman MA, Prasad AR. Synthesis of the Spiroketal Fragment of (-)-Ushikulide A. European J Org Chem 2014. [DOI: 10.1002/ejoc.201402196] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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37
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Gao L, Lu J, Song Z. Recent efforts to construct the B-ring of bryostatins. Chem Commun (Camb) 2014; 49:10211-20. [PMID: 24051556 DOI: 10.1039/c3cc45947k] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Among macrocyclic natural products, bryostatins have excellent bioactivities and unique structures that make them highly attractive to synthetic chemists. Particularly challenging for the total synthesis of bryostatins is the B-ring, which features a cis-tetrahydropyran containing a geometrically defined exocyclic Z-methyl enoate. Synthetic chemists have recently displayed great prowess in their efforts to construct this ring, and here we summarize the progress towards this goal.
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Affiliation(s)
- Lu Gao
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry, Department of Medicinal Chemistry, West China School of Pharmacy, Sichuan University, Chengdu, 610041, China.
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38
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Reddy KM, Yamini V, Singarapu KK, Ghosh S. Synthesis of Proposed Aglycone of Mandelalide A. Org Lett 2014; 16:2658-60. [DOI: 10.1021/ol500875e] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Karla Mahender Reddy
- Organic and Biomolecular Chemistry Division, ‡Centre for NMR & Structural Chemistry, CSIR-Indian Institute of Chemical Technology, Tarnaka, Hyderabad-500007, India
| | - Vanipenta Yamini
- Organic and Biomolecular Chemistry Division, ‡Centre for NMR & Structural Chemistry, CSIR-Indian Institute of Chemical Technology, Tarnaka, Hyderabad-500007, India
| | - Kiran K. Singarapu
- Organic and Biomolecular Chemistry Division, ‡Centre for NMR & Structural Chemistry, CSIR-Indian Institute of Chemical Technology, Tarnaka, Hyderabad-500007, India
| | - Subhash Ghosh
- Organic and Biomolecular Chemistry Division, ‡Centre for NMR & Structural Chemistry, CSIR-Indian Institute of Chemical Technology, Tarnaka, Hyderabad-500007, India
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39
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Yadav JS, Mallikarjuna Reddy N, Ataur Rahman M, Mallikarjuna Reddy A, Prasad AR. Stereoselective Total Synthesis of Botryolide E and Ophiocerin C. Helv Chim Acta 2014. [DOI: 10.1002/hlca.201300203] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
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40
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Lombardo VM, Thomas CD, Scheidt KA. A Tandem Isomerization/Prins Strategy: Iridium(III)/Brønsted Acid Cooperative Catalysis. Angew Chem Int Ed Engl 2013. [DOI: 10.1002/ange.201306462] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
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41
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Lombardo VM, Thomas CD, Scheidt KA. A tandem isomerization/prins strategy: iridium(III)/Brønsted acid cooperative catalysis. Angew Chem Int Ed Engl 2013; 52:12910-4. [PMID: 24218144 DOI: 10.1002/anie.201306462] [Citation(s) in RCA: 62] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2013] [Indexed: 02/03/2023]
Abstract
Working together: A mild and efficient isomerization/protonation sequence generates pyran-fused indoles by cooperative catalysis between cationic iridium(III) and Bi(OTf)3 . Three distinct cyclization manifolds lead to the corresponding bioactive scaffolds in good yields. In addition, N-substituted indoles can be synthesized enantioselectively in the presence of a chiral phosphate.
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Affiliation(s)
- Vince M Lombardo
- Department of Chemistry, Center for Molecular Innovation and Drug Discovery, Chicago Tri-Institutional Center for Chemical Methods and Library Development (CT-CMLD), Northwestern University, 2145 Sheridan Road, Evanston, IL 60208 (USA)
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42
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Boussonnière A, Bénéteau R, Lebreton J, Dénès F. Aluminum Acetals in Organic Synthesis. European J Org Chem 2013. [DOI: 10.1002/ejoc.201300624] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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43
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Hinkle RJ, Lewis SE. Atom economical, one-pot, three-reaction cascade to novel tricyclic 2,4-dihydro-1H-benzo[f]isochromenes. Org Lett 2013; 15:4070-3. [PMID: 23901903 PMCID: PMC4447333 DOI: 10.1021/ol401600j] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Reaction of 6-methyl-1-phenylhept-3-yne-2,6-diol with various aldehydes under Lewis acid conditions provides an atom economical, two-component cascade reaction sequence to novel 2,4-dihydro-1H-benzo[f]isochromene compounds. Aliphatic aldehydes as well as electron-deficient and -rich aromatic aldehydes can be used.
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Affiliation(s)
- Robert J Hinkle
- Department of Chemistry, The College of William & Mary, P.O. Box 8795, Williamsburg, Virginia 23187-8795, USA.
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44
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A theoretical investigation of the reaction mechanism for hydrogenated furan formation under Prins reaction conditions in trifluoroacetic acid medium. REACTION KINETICS MECHANISMS AND CATALYSIS 2013. [DOI: 10.1007/s11144-013-0563-4] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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45
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Yeh MCP, Liang CJ, Huang TL, Hsu HJ, Tsau YS. Transition-metal-free carbofluorination of TBS-protected nitrogen-containing cyclic enynols: synthesis of fluorinated azabicycles. J Org Chem 2013; 78:5521-9. [PMID: 23688341 DOI: 10.1021/jo400634c] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
The synthesis of fluorinated azabicycles from tert-butyldimethylsilyl-protected N-containing cyclic enynols using inexpensive BF3·OEt2 is described. In this reaction, BF3 reacts as both the Lewis acid and the fluoride source for cyclization/fluorination of the TBS-protected cyclic N-containing enynols. The method provides an easy access to fluorinated azabicycles where a new C(sp(2))-F bond and a new bicyclic skeleton are generated at ambient temperature within 1-13 min under metal-free reaction conditions.
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Affiliation(s)
- Ming-Chang P Yeh
- Department of Chemistry, National Taiwan Normal University, 88 Ding-Jou Road, Section 4, Taipei 11677, Taiwan, Republic of China.
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46
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Mohamed RK, Peterson PW, Alabugin IV. Concerted Reactions That Produce Diradicals and Zwitterions: Electronic, Steric, Conformational, and Kinetic Control of Cycloaromatization Processes. Chem Rev 2013; 113:7089-129. [DOI: 10.1021/cr4000682] [Citation(s) in RCA: 166] [Impact Index Per Article: 15.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Affiliation(s)
- Rana K. Mohamed
- Department of Chemistry
and Biochemistry, Florida State University, Tallahassee, Florida 32306-4390,
United States
| | - Paul W. Peterson
- Department of Chemistry
and Biochemistry, Florida State University, Tallahassee, Florida 32306-4390,
United States
| | - Igor V. Alabugin
- Department of Chemistry
and Biochemistry, Florida State University, Tallahassee, Florida 32306-4390,
United States
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47
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How to Lose a Bond in Two Ways ― The Diradical/Zwitterion Dichotomy in Cycloaromatization Reactions. European J Org Chem 2013. [DOI: 10.1002/ejoc.201201656] [Citation(s) in RCA: 78] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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48
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Yao H, Ren J, Tong R. A short and flexible route to tetrahydropyran-4-ones via conjugated nitrile oxidescycloaddition and oxa-Michael cyclization: a concise diastereoselective total synthesis of (±)-diospongin A. Chem Commun (Camb) 2013; 49:193-5. [DOI: 10.1039/c2cc37772a] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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49
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Oger C, Balas L, Durand T, Galano JM. Are alkyne reductions chemo-, regio-, and stereoselective enough to provide pure (Z)-olefins in polyfunctionalized bioactive molecules? Chem Rev 2012. [PMID: 23194255 DOI: 10.1021/cr3001753] [Citation(s) in RCA: 251] [Impact Index Per Article: 20.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Affiliation(s)
- Camille Oger
- Institut des Biomolécules Max Mousseron, UMR CNRS 5247, Université Montpellier 1, Faculté de Pharmacie, 15 av. Charles Flahault, Bât. D, 34093 Montpellier Cedex 05, France
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50
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Zou Y, Mouhib H, Stahl W, Goeke A, Wang Q, Kraft P. Efficient macrocyclization by a novel oxy-oxonia-Cope reaction: synthesis and olfactory properties of new macrocyclic musks. Chemistry 2012; 18:7010-5. [PMID: 22539460 DOI: 10.1002/chem.201200882] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2012] [Indexed: 11/07/2022]
Affiliation(s)
- Yue Zou
- Department of Chemistry, Fudan University, 220 Handan Road, Shanghai, 200433, PR China
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