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Phosphine-Catalyzed Domino Regio- and Stereo-Selective Hexamerization of 2-(Bromomethyl)acrylates to 1,2-Bis(cyclohexenyl)ethenyl Derivatives. Org Lett 2023; 25:7380-7384. [PMID: 37772494 PMCID: PMC10580324 DOI: 10.1021/acs.orglett.3c02836] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2023] [Indexed: 09/30/2023]
Abstract
A phosphine-catalyzed domino assembly of six units of 2-bromomethyl acrylates afforded polyalkenyl adducts containing two cyclohexenyl rings. This reaction occurs under mild conditions providing the final product by formation of seven carbon-carbon bonds and four stereocenters. Experimental and computational studies support an initial dimerization of the substrate, which in turn trimerizes involving two totally regio- and stereocontrolled Diels-Alder cycloadditions. The yield of the hexamerization of the 2-bromomethyl acrylates depends on the size of the ester function. The protocol has also proved to be practicable on a gram scale.
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Copper(II)-Catalyzed Three-Component Arylation/Hydroamination Cascade from Allyl Alcohol: Access to 1-Aryl-2-sulfonylamino-propanes. J Org Chem 2023; 88:13995-14003. [PMID: 37747795 PMCID: PMC10563128 DOI: 10.1021/acs.joc.3c01536] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2023] [Indexed: 09/27/2023]
Abstract
A new straightforward approach to 1-aryl-2-aminopropanes using easily accessible substrates has been developed. Simple allyl alcohol is shown to be an ideal synthetic equivalent of the C3 propane-1,2-diylium bis-cation synthon in three-component cascade reactions with arenes and sulfonamide nucleophiles to regioselectively afford 1-aryl-2-aminopropanes. The reaction is catalyzed by Cu(OTf)2 and is expected to involve a Friedel-Crafts-type allylation of the arene, followed by hydroamination.
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Allylsulfones via Palladium‐Catalyzed Allylic C–H Sulfonylation of Terminal Alkenes. European J Org Chem 2023. [DOI: 10.1002/ejoc.202201493] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
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4
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A Non‐coded β2,2‐Amino Acid with Isoxazoline Core Able to Stabilize Peptides Folding Through an Unprecedented Hydrogen Bond. European J Org Chem 2022. [DOI: 10.1002/ejoc.202200601] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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5
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Ruthenium‐Catalyzed Decarboxylative Rearrangement of 4‐Alkenyl‐isoxazol‐5‐ones to Pyrrole Derivatives. European J Org Chem 2022. [DOI: 10.1002/ejoc.202200496] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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6
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Non-Decarboxylative Ruthenium-Catalyzed Rearrangement of 4-Alkylidene-isoxazol-5-ones to Pyrazole- and Isoxazole-4-carboxylic Acids. Org Lett 2022; 24:3092-3096. [PMID: 35439418 PMCID: PMC9062882 DOI: 10.1021/acs.orglett.2c01135] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2022] [Indexed: 12/28/2022]
Abstract
Treatment of 4-(2-hydroaminoalkylidenyl)- and 4-(2-hydroxyalkylidenyl)-substituted isoxazol-5(4H)-ones with catalytic amounts of [RuCl2(p-cymene)]2, without any additive, afforded pyrazole- and isoxazole-4-carboxylic acids, respectively. The presence of an intramolecular H-bond in these substrates was the key to divert the classical mechanism toward a ring-opening non-decarboxylative path that is expected to generate a vinyl Ru-nitrenoid intermediate, the cyclization of which affords the rearranged products. A gram scale protocol demonstrated the synthetic applicability of this transformation.
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Redox-Neutral Ru(0)-Catalyzed Alkenylation of 2-Carboxaldimine-heterocyclopentadienes. J Org Chem 2022; 87:4640-4648. [PMID: 35290058 DOI: 10.1021/acs.joc.1c03044] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
A new Ru3(CO)12-catalyzed directed alkenylation of 2-carboxaldimine-heterocyclopentadienes has been accomplished. This process allows coupling of furan, pyrrole, indole, and thiophene 2-carboxaldimines with electron-poor alkenes such as acrylates, vinylsulfones, and styrenes. This regio- and chemoselective oxidative C-H coupling does not require the presence of an additional sacrificial oxidant. Density functional theory calculations allowed us to propose a mechanism and unveiled the nature of the H2 acceptor.
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Direct Synthesis of Fluorescent Oxazolo-phenoxazines by Copper-Catalyzed/Hypervalent Iodine(III)-Mediated Dimerization/Cyclization of 2-Benzylamino-phenols. J Org Chem 2022; 87:1032-1042. [PMID: 35014843 DOI: 10.1021/acs.joc.1c02329] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
A dimerization/cyclization reaction of 2-benzylamino-phenols for the direct synthesis of the oxazolo-phenoxazine skeleton is reported. The reaction occurs under copper catalysis in the presence of hypervalent iodine(III), giving selectively the 5H-oxazolo[4,5-b]phenoxazine compounds. The cascade process, which allows the conversion of the substrates into the tetracyclic products, involves three C-H functionalization steps. Initial oxidation of electron-rich arenes by the hypervalent iodine is essential for the dimerization of substrates, whereas the formation of the five-membered rings is promoted by the copper species. 1-Benzyl-2-phenyl-6-(aryl-benzyl)amino-benzimidazoles are regioselectively obtained using N,N'-dibenzyl-phenylenediamines as starting substrates. The fluorescence emission properties of these classes of products have been evaluated.
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Abstract
Treatment of O-allyl N-tosyl carbamates with aromatic compounds in the presence of Cu(OTf)2 or TMSOTf as promoters, affords N-substituted 1-arylpropan-2-amines, 1,2-diarylpropanes, 1,1-diarylpropanes, or indanes, depending on the nature of the...
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Abstract
A protocol for the synthesis of modified morpholino monomers was performed in few steps through the condensation between 6-hydroxymethyl-morpholine acetal and nucleobases under Lewis acid conditions. The key common precursor...
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Front Cover: Oxoammonium‐Mediated Allylsilane–Ether Coupling Reaction (Eur. J. Org. Chem. 15/2021). European J Org Chem 2021. [DOI: 10.1002/ejoc.202100375] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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13
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14
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Ru‐Catalyzed Carbonylative Murai Reaction: Directed C3‐Acylation of Biomass‐Derived 2‐Formyl Heteroaromatics. Adv Synth Catal 2020. [DOI: 10.1002/adsc.202000249] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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15
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Divergent Conversion of 4-Naphthoquinone-substituted 4 H-Isoxazolones to Different Benzo-fused Indole Derivatives. Org Lett 2020; 22:2735-2739. [PMID: 32182085 DOI: 10.1021/acs.orglett.0c00709] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
4,4-Disubstituted 4H-isoxazol-5-ones bearing a 1,4-naphthoquinone moiety undergo transformation into different types of benzoindolyl products depending on the different reaction conditions. A decarboxylative ring opening/ring closure promoted by catalytic [Ru(p-cymene)2Cl2]2 yields benzo[f]indole-4,9-diones. Alternatively, hydrogenation reactions provide the conversion of 4-(1,4-naphthoquinone)-substituted isoxazol-5-ones to benzo[g]indole compounds, with the level of reduction depending on the substituents present on the ring. Starting materials have been easily prepared by the functionalization of isoxazolinones with naphthoquinone under mild conditions.
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Intramolecular Aminoazidation of Unactivated Terminal Alkenes by Palladium-Catalyzed Reactions with Hydrogen Peroxide as the Oxidant. Org Lett 2020; 22:1402-1406. [DOI: 10.1021/acs.orglett.0c00010] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
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17
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Iodoamination of Alkenyl Sulfonamides by Potassium Iodide and Hydrogen Peroxide in Aqueous Medium. Helv Chim Acta 2019. [DOI: 10.1002/hlca.201900088] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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18
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Divergent Palladium- and Platinum-Catalyzed Intramolecular Hydroamination/Hydroarylation of O
-Propargyl-2-aminophenols. European J Org Chem 2018. [DOI: 10.1002/ejoc.201801103] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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19
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Copper-Catalyzed Alkoxylation as Key Step to Convert Isatin to Oxazinoindol-2-one Derivatives. ChemistrySelect 2018. [DOI: 10.1002/slct.201800568] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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20
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Transition Metal-Catalyzed Intramolecular Amination and Hydroamination Reactions of Allenes. ADVANCES IN ORGANOMETALLIC CHEMISTRY 2018. [DOI: 10.1016/bs.adomc.2018.02.003] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
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21
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Selective 7-endo-Cyclization of 3-Aza-5-alkenols through Oxidative Pd(II)-Catalyzed Olefin Oxyarylation. Synlett 2017. [DOI: 10.1055/s-0036-1590939] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
3-Aza-5-alkenols undergo selective 7-endo-trig cyclization when treated with a catalytic Pd(II) species, CuCl2 and ArSnBu3 giving 7-aryl-substituted oxazepanes. The intramolecular alkoxylation occurs with formation of a seven-membered ring only when associated with an arylating step. Otherwise, 6-exo-trig reactions, providing morpholine derivatives, were observed.
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22
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(Diacyloxyiodo)benzenes-Driven Palladium-Catalyzed Cyclizations of UnsaturatedN-Sulfonylamides: Opportunities of Path Selection. Adv Synth Catal 2017. [DOI: 10.1002/adsc.201600813] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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23
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Palladium-Catalysed Carbo- and Hydroamination of Allenyl Ethers and Aminoallenes: Available Entry to Nitrogen-Containing Benzo-Fused Rings. European J Org Chem 2016. [DOI: 10.1002/ejoc.201600720] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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25
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Abstract
Two complementary Pd-catalyzed protocols enabling the γ-selective intermolecular allylic amination of but-3-enoic acid derivatives are reported. These transformations can be successfully achieved via either a direct Pd(II)-catalyzed protocol or by way of a one-pot Pd(II)/Pd(0)-catalyzed sequence, depending on the nature of the nitrogen nucleophile used.
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Intramolecular oxidative palladium-catalyzed diamination reactions of alkenyl sulfamates: an efficient synthesis of [1,2,5]thiadiazolo-fused piperazinones. RSC Adv 2016. [DOI: 10.1039/c6ra13141g] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
Abstract
A palladium-catalyzed diamination domino process of sulfamates arising from glycine allylamides is reported.
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Copper(II)-Catalyzed Alkoxyhalogenation of Alkynyl Ureas and Amides as a Route to Haloalkylidene-Substituted Heterocycles. J Org Chem 2015; 80:7226-34. [PMID: 26111065 DOI: 10.1021/acs.joc.5b01227] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
A highly effective synthesis of haloalkylidene-substituted heterocycles by copper(II)-catalyzed cyclization of alkynyl ureas and secondary amides has been developed. The reaction, which involves a catalytic amount of CuCl2 and a stoichiometric amount of N-halosuccinimide, occurs selectively through an alkoxyhalogenation process. Alternatively, alkoxychlorination and alkoxybromination reactions can be performed working solely with stoichiometric CuCl2 and CuBr2, respectively.
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28
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Intra-Intermolecular Palladium-Catalyzed Domino Reactions of Glycine Allylamides for the Synthesis of Diversely Functionalized Piperazinones. European J Org Chem 2015. [DOI: 10.1002/ejoc.201500386] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
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29
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Ruthenium-Catalyzed Hydroamination of Aminoallenes: an Approach to Vinyl Substituted Heterocycles. Adv Synth Catal 2015. [DOI: 10.1002/adsc.201400776] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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30
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Recent advances in heterobimetallic palladium(ii)/copper(ii) catalyzed domino difunctionalization of carbon–carbon multiple bonds. Org Biomol Chem 2014; 12:6767-89. [DOI: 10.1039/c4ob00610k] [Citation(s) in RCA: 66] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
The Pd(ii)/Cu(ii)-catalysed double functionalization of carbon–carbon multiple bonds in domino processes has emerged in recent years as a fruitful tool for the rapid synthesis of complex molecular scaffolds.
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Selective Intramolecular Palladium(II)-Catalyzed Aminooxygenationvs.Diamination of Alkenylureas: Efficient Microwave-Assisted Reactions to Bicyclic Piperazinones. Adv Synth Catal 2013. [DOI: 10.1002/adsc.201300104] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
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33
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Palladium-catalyzed dual C-H or N-H functionalization of unfunctionalized indole derivatives with alkenes and arenes. Beilstein J Org Chem 2012; 8:1730-46. [PMID: 23209507 PMCID: PMC3511007 DOI: 10.3762/bjoc.8.198] [Citation(s) in RCA: 80] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2012] [Accepted: 09/10/2012] [Indexed: 01/10/2023] Open
Abstract
This review highlights the development of palladium-catalyzed C-H and N-H functionalization reactions involving indole derivatives. These procedures require unactivated starting materials and are respectful of the basic principle of sustainable chemistry tied to atom economy.
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Transition-Metal-Catalyzed Hydroamination and Carboamination Reactions of Anthranilic Allenamides as a Route to 2-Vinyl- and 2-(α-Styryl)quinazolin-4-one Derivatives. European J Org Chem 2012. [DOI: 10.1002/ejoc.201200353] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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35
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Palladium(II)/Copper Halide/Solvent Combination for Selective Intramolecular Domino Reactions of Indolecarboxylic Acid Allylamides: An Unprecedented Arylation/Esterification Sequence. Adv Synth Catal 2012. [DOI: 10.1002/adsc.201100614] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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36
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Solvent-free, microwave-assisted N-arylation of indolines by using low palladium catalyst loadings. CHEMSUSCHEM 2011; 4:1637-1642. [PMID: 21882355 DOI: 10.1002/cssc.201100098] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/24/2011] [Revised: 06/16/2011] [Indexed: 05/31/2023]
Abstract
Indoline-based compounds are abundant in nature, and the indoline skeleton is an often-encountered scaffold in a range of biologically active alkaloids, pharmaceutically active compounds, and functional molecules (e.g., sensitizers for solar cells). The wide range of uses warrants further interest in the structural modification of this class of compounds. A series of substituted N-aryl indolines is prepared by a solvent-free, palladium-catalyzed procedure. The procedure requires only low loadings of catalyst, uses microwave irradiation, and starts from commercially available substrates. The method proceeds in good yields and in short reaction times with aryl bromides, chlorides, and iodides, also on 2-substituted indolines. The combination of solvent-free methods with microwave heating will further increase in importance in the search for more environmentally acceptable synthesis methods.
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Access to pyrrolo-pyridines by gold-catalyzed hydroarylation of pyrroles tethered to terminal alkynes. Beilstein J Org Chem 2011; 7:1468-74. [PMID: 22238519 PMCID: PMC3252845 DOI: 10.3762/bjoc.7.170] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2011] [Accepted: 10/06/2011] [Indexed: 12/05/2022] Open
Abstract
In a simple procedure, the intramolecular hydroarylation of N-propargyl-pyrrole-2-carboxamides was accomplished with the aid of gold(III) catalysis. The reaction led to differently substituted pyrrolo[2,3-c]pyridine and pyrrolo[3,2-c]pyridine derivatives arising either from direct cyclization or from a formal rearrangement of the carboxamide group. Terminal alkynes are essential to achieve bicyclic pyrrolo-fused pyridinones by a 6-exo-dig process, while the presence of a phenyl group at the C–C triple bond promotes the 7-endo-dig cyclization giving pyrrolo-azepines.
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38
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On the Stability of Polyalanine Secondary Structures: The Role of the Polyproline II Helix. Chemphyschem 2011; 12:2724-7. [DOI: 10.1002/cphc.201100378] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2011] [Indexed: 11/06/2022]
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39
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Enantiopure 2-piperidylacetaldehyde as a useful building block in the diversity-oriented synthesis of polycyclic piperidine derivatives. ACTA ACUST UNITED AC 2011. [DOI: 10.1016/j.tetasy.2011.01.008] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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40
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Intramolecular Oxidative Pd(II)-Catalyzed Alkoxylation of 3-Aza-5-alkenols with O2 as Sole Oxidant: Mild Conditions for the Synthesis of 1,4-Oxazine Derivatives. Synlett 2011. [DOI: 10.1055/s-0030-1259295] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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41
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An Alternative Synthesis of 2-Alkylidene-3,4-dihydro-2H-1,4-benzoxazines by Intramolecular Gold-Catalyzed Hydroalkoxylation of 2-(Prop-2-yn-1-ylamino)phenols. SYNTHESIS-STUTTGART 2010. [DOI: 10.1055/s-0030-1258346] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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42
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The creation of the cisgenic scab resistant apple. J Biotechnol 2010. [DOI: 10.1016/j.jbiotec.2010.08.299] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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43
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Tunable Pd-Catalyzed Cyclization of Indole-2-carboxylic Acid Allenamides: Carboamination vs Microwave-Assisted Hydroamination. J Org Chem 2010; 75:6923-32. [DOI: 10.1021/jo101501u] [Citation(s) in RCA: 66] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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44
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Access to a Novel Class of Tetracyclic 1,4-Benzodiazepin-5-ones Starting from α-Amino Acids by Pd-Catalyzed Amination/1,3-Dipolar Cycloaddition as the Key Steps. European J Org Chem 2010. [DOI: 10.1002/ejoc.200901290] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
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45
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σ-Alkylpalladium Intermediates in Intramolecular Heck Reactions:Isolation and Catalytic Activity. Chemistry 2010; 16:1670-8. [DOI: 10.1002/chem.200902071] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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46
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Gold-catalyzed intramolecular hydroamination of α-amino allenamides as a route to enantiopure 2-vinylimidazolidinones. Tetrahedron Lett 2009. [DOI: 10.1016/j.tetlet.2009.06.011] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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47
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Efficient palladium-catalyzed direct arylation of azines and diazines using ligand-free conditions. Tetrahedron 2009. [DOI: 10.1016/j.tet.2009.02.025] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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48
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Palladium-Catalyzed Domino Carbopalladation/5-exo-Allylic Amination of α-Amino Allenamides: An Efficient Entry to Enantiopure Imidazolidinones. Org Lett 2009; 11:1563-6. [DOI: 10.1021/ol900171g] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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49
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Synthesis of Enantiopure Highly Functionalized Pyrrolizines and Indolizines from Natural α-Amino Acids: An Experimental and Theoretical Investigation. European J Org Chem 2008. [DOI: 10.1002/ejoc.200701217] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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50
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Intramolecular Pd(II)-catalyzed cyclization of propargylamides: straightforward synthesis of 5-oxazolecarbaldehydes. J Org Chem 2008; 73:4746-9. [PMID: 18489152 DOI: 10.1021/jo800621n] [Citation(s) in RCA: 96] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Direct synthesis of 2-substituted 5-oxazolecarbaldehydes was performed by intramolecular reaction of propargylamides through treatment with a catalytic amount of Pd(II) salts in the presence of a stoichiometric amount of reoxidant agent. The heterocyclization process was well-tolerated by a wide range of aryl, heteroaryl, and alkyl propargylamides. This protocol constitutes a valuable synthetic pathway to 5-oxazolecarbaldehydes, alternative to the formylation on oxazole rings, often unsatisfactory in term of regioselectivity and yields.
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