1
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Lazzaroni S, Ravelli D, Protti S, Fagnoni M, Albini A. Photochemical synthesis: Using light to build C–C bonds under mild conditions. CR CHIM 2017. [DOI: 10.1016/j.crci.2015.11.024] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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3
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García Martínez A, de la Moya Cerero S, Osío Barcina J, Moreno Jiménez F, Lora Maroto B. The Mechanism of Hydrolysis of Aryldiazonium Ions Revisited: Marcus Theory vs. Canonical Variational Transition State Theory. European J Org Chem 2013. [DOI: 10.1002/ejoc.201300834] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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4
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Moreno-Sanz G, Duranti A, Melzig L, Fiorelli C, Ruda GF, Colombano G, Mestichelli P, Sanchini S, Tontini A, Mor M, Bandiera T, Scarpelli R, Tarzia G, Piomelli D. Synthesis and structure-activity relationship studies of O-biphenyl-3-yl carbamates as peripherally restricted fatty acid amide hydrolase inhibitors. J Med Chem 2013; 56:5917-30. [PMID: 23822179 DOI: 10.1021/jm4007017] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
The peripherally restricted fatty acid amide hydrolase (FAAH) inhibitor URB937 (3, cyclohexylcarbamic acid 3'-carbamoyl-6-hydroxybiphenyl-3-yl ester) is extruded from the brain and spinal cord by the Abcg2 efflux transporter. Despite its inability to enter the central nervous system (CNS), 3 exerts profound antinociceptive effects in mice and rats, which result from the inhibition of FAAH in peripheral tissues and the consequent enhancement of anandamide signaling at CB1 cannabinoid receptors localized on sensory nerve endings. In the present study, we examined the structure-activity relationships (SAR) for the biphenyl region of compound 3, focusing on the carbamoyl and hydroxyl groups in the distal and proximal phenyl rings. Our SAR studies generated a new series of peripherally restricted FAAH inhibitors and identified compound 35 (cyclohexylcarbamic acid 3'-carbamoyl-5-hydroxybiphenyl-3-yl ester) as the most potent brain-impermeant FAAH inhibitor disclosed to date.
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Affiliation(s)
- Guillermo Moreno-Sanz
- Drug Discovery and Development, Fondazione Istituto Italiano di Tecnologia , via Morego 30, I-16163 Genova, Italy
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5
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Protti S, Ravelli D, Fagnoni M, Albini A. Smooth photogeneration of α,n-didehydrotoluenes (DHTs). PURE APPL CHEM 2013. [DOI: 10.1351/pac-con-12-10-03] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Irradiation of the three isomeric (chlorobenzyl)trimethylsilanes in
methanol–water generates the corresponding didehydrotoluenes (DHTs). The process
involves expulsion of a chloride ion to give the triplet phenyl cation and
ensuing elimination of the trimethylsilyl cation. This straightforward
generation of DHT intermediates overcomes a shortcoming of previous methodology
(cycloaromatization of enyne-allenes), which is limited to the
meta-isomer, and opens the path for understanding the
chemistry (and possibly the biological action) of these unusual
intermediates.
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Affiliation(s)
- Stefano Protti
- 1PhotoGreen Lab, Department of Chemistry, University of Pavia, via Taramelli 12, 27100 Pavia, Italy
| | - Davide Ravelli
- 1PhotoGreen Lab, Department of Chemistry, University of Pavia, via Taramelli 12, 27100 Pavia, Italy
| | - Maurizio Fagnoni
- 1PhotoGreen Lab, Department of Chemistry, University of Pavia, via Taramelli 12, 27100 Pavia, Italy
| | - Angelo Albini
- 1PhotoGreen Lab, Department of Chemistry, University of Pavia, via Taramelli 12, 27100 Pavia, Italy
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6
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Ravelli D, Protti S, Fagnoni M, Albini A. From Phenyl Chlorides to α,n-Didehydrotoluenes via Phenyl Cations. A CPCM–CASMP2 Investigation. J Org Chem 2013; 78:3814-20. [DOI: 10.1021/jo400269s] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Davide Ravelli
- PhotoGreen Lab, Department of Chemistry, University of Pavia, Viale Taramelli 12, 27100 Pavia,
Italy
| | - Stefano Protti
- PhotoGreen Lab, Department of Chemistry, University of Pavia, Viale Taramelli 12, 27100 Pavia,
Italy
| | - Maurizio Fagnoni
- PhotoGreen Lab, Department of Chemistry, University of Pavia, Viale Taramelli 12, 27100 Pavia,
Italy
| | - Angelo Albini
- PhotoGreen Lab, Department of Chemistry, University of Pavia, Viale Taramelli 12, 27100 Pavia,
Italy
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7
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Shainyan BA, Tolstikova LL. Trifluoromethanesulfonamides and Related Compounds. Chem Rev 2012; 113:699-733. [DOI: 10.1021/cr300220h] [Citation(s) in RCA: 88] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Bagrat A. Shainyan
- A. E. Favorsky Irkutsk Institute
of Chemistry, Siberian Division of Russian Academy of Science, 1
Favorsky Street, Irkutsk 664033, Russia
| | - Ljudmila L. Tolstikova
- A. E. Favorsky Irkutsk Institute
of Chemistry, Siberian Division of Russian Academy of Science, 1
Favorsky Street, Irkutsk 664033, Russia
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8
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Raviola C, Protti S, Ravelli D, Mella M, Albini A, Fagnoni M. Acetalization allows the photoheterolysis of the Ar-Cl bond in chlorobenzaldehydes and chloroacetophenones. J Org Chem 2012; 77:9094-101. [PMID: 22963457 DOI: 10.1021/jo3016264] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The nonaccessibility of phenyl cations by irradiation of electron-poor aryl chlorides was circumvented by transforming the carbonyl group of aromatic ketones or aldehydes into the corresponding 1,3-dioxolanes and the carboxyl group of benzoate ester into an orthoester functionality. This transformation allowed the heterolytic photoactivation of the Ar-Cl bond in protic media and the generation of phenyl cations. In the presence of π-bond nucleophiles, arylated products were obtained in good to excellent yields.
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Affiliation(s)
- Carlotta Raviola
- PhotoGreen Lab, Department of Chemistry, University of Pavia, Viale Taramelli 12, 27100 Pavia, Italy
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9
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Thangaraj S, Tsao WS, Luo YW, Lee YJ, Chang CF, Lin CC, Uang BJ, Yu CC, Guh JH, Teng CM. Total synthesis of moniliformediquinone and calanquinone A as potent inhibitors for breast cancer. Tetrahedron 2011. [DOI: 10.1016/j.tet.2011.06.054] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
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10
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Qing-Yun C, Ya-Bo H. Palladium-catalyzed cross-coupling reaction of phenyl fluoroalkanesulfonates with organometallics. CHINESE J CHEM 2011. [DOI: 10.1002/cjoc.19900080511] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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11
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Bonaterra M, Rossi RA, Martín SE. Organoheteroatom Stannanes in Palladium-Catalyzed Cross-Coupling Reactions with 1-Naphthyl Triflate. Organometallics 2009. [DOI: 10.1021/om8009816] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Mariana Bonaterra
- INFIQC, Departamento de Química Orgánica, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Haya de Torre y Medina Allende, 5000 Córdoba, Argentina
| | - Roberto A. Rossi
- INFIQC, Departamento de Química Orgánica, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Haya de Torre y Medina Allende, 5000 Córdoba, Argentina
| | - Sandra E. Martín
- INFIQC, Departamento de Química Orgánica, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Haya de Torre y Medina Allende, 5000 Córdoba, Argentina
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12
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Morita N, Toyota K, Ito S. The Chemistry of 2H-Cyclohepta[b]furan-2-one: Synthesis, Transformation and Spectral Properties. HETEROCYCLES 2009. [DOI: 10.3987/rev-09-654] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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13
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Manet I, Monti S, Grabner G, Protti S, Dondi D, Dichiarante V, Fagnoni M, Albini A. Revealing Phenylium, Phenonium, Vinylenephenonium, and Benzenium Ions in Solution. Chemistry 2008; 14:1029-39. [DOI: 10.1002/chem.200701043] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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14
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Ussing BR, Singleton DA. Isotope effects, dynamics, and the mechanism of solvolysis of aryldiazonium cations in water. J Am Chem Soc 2005; 127:2888-99. [PMID: 15740124 DOI: 10.1021/ja043918p] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The mechanism of the heterolytic solvolysis of p-tolyldiazonium cation in water was studied by a combination of kinetic isotope effects, theoretical calculations, and dynamics trajectories. Significant (13)C kinetic isotope effects were observed at the ipso (k(12)C/k(13)C = 1.024), ortho (1.017), and meta (1.013) carbons, indicative of substantial weakening of the C(2)-C(3) and C(5)-C(6) bonds at the transition state. This is qualitatively consistent with a transition state forming an aryl cation, but on a quantitative basis, simple S(N)1 heterolysis does not account best for the isotope effects. Theoretical S(N)2Ar transition structures for concerted displacement of N(2) by a single water molecule lead to poor predictions of the experimental isotope effects. The best predictions of the (13)C isotope effects arose from transition structures for the heterolytic process solvated by clusters of water molecules. These structures, formally saddle points for concerted displacements on the potential energy surface, may be described as transition structures for solvent reorganization around the aryl cation. Quasiclassical dynamics trajectories starting from these transition structures afforded products very slowly, compared to a similar S(N)2 displacement, and the trajectories often afforded long-lived aryl cation intermediates. Critical prior evidence for aryl cation intermediates is reconsidered with the aid of DFT calculations. Overall, the nucleophilic displacement process for aryldiazonium ions in water is at the boundary between S(N)2Ar and S(N)1 mechanisms, and an accurate view of the reaction mechanism requires consideration of dynamic effects.
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Affiliation(s)
- Bryson R Ussing
- Department of Chemistry, Texas A&M University, P.O. Box 30012, College Station, Texas 77842, USA
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15
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Milanesi S, Fagnoni M, Albini A. (Sensitized) Photolysis of Diazonium Salts as a Mild General Method for the Generation of Aryl Cations. Chemoselectivity of the Singlet and Triplet 4-Substituted Phenyl Cations. J Org Chem 2004; 70:603-10. [PMID: 15651808 DOI: 10.1021/jo048413w] [Citation(s) in RCA: 72] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The photolysis of a series of 4-X-benzenediazonium tetrafluoroborates is studied in MeCN. Loss of nitrogen occurs from the singlet excited state with X=H, t-Bu, and NMe2 and leads to the singlet aryl cation. This adds to the solvent yielding the corresponding acetanilides. With other substituents, ISC competes with (X=Br, CN) or overcomes (X=COMe, NO2) fragmentation and the aryl cation is formed in part or completely in the triplet state. In neat MeCN, this either abstracts hydrogen from the solvent (in most cases inefficiently) or undergoes intersystem crossing to the more stable singlet that reacts as above. In the presence of pi nucleophiles (allyltrimethylsilane or benzene), the triplet aryl cation is efficiently trapped giving substituted allylbenzenes and biphenyls, respectively. By triplet sensitization by xanthone, the triplet cation and the products from it are obtained from the whole series considered. The direct or sensitized photodecomposition of diazonium fluoroborates, substituted with both electron-donating and -withdrawing substituents, in the presence of alkenes and arenes offers an access to an alternative arylation procedure.
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Affiliation(s)
- Silvia Milanesi
- Dipartimento di Chimica Organica, Università, V. Taramelli 10, 27100 Pavia, Italy
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16
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Palladium-catalyzed cross-coupling reaction of bis(pinacolato)diboron with vinyl triflates β-substituted by a carbonyl group: efficient synthesis of β-boryl-α,β-unsaturated carbonyl compounds and their synthetic utility. J Organomet Chem 2003. [DOI: 10.1016/s0022-328x(03)00611-9] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Abstract
We have synthesized all three possible isomers of C-hydroxycarborane from the corresponding amines via diazotization. The O-protonated C-hydroxycarboranes were characterized using the NMR spectrum measurements. Attempts at generating of carboranyl carbocations were carried out by the solvolyses of C-tosylates and C-triflates, as well as by treatment with superacids. Anchimeric assistance of both homoconjugative and hyperconjugative substituents was also investigated, as demonstrated by a successful strategy devised for the solvolytic generation of a phenyl cation. However, we have not been able to chemically provide any evidence of carboranyl carbocations, although the carboranyl carbocation may be an intermediate in the decomposition of the C-carboranediazonium ion.
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Affiliation(s)
- Motonori Tsuji
- Graduate School of Pharmaceutical Sciences, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan.
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18
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Guizzardi B, Mella M, Fagnoni M, Albini A. Phenonium ions from the addition of phenyl cations to alkenes. Photochemical synthesis of (rearranged) aminoalkylanilines from haloanilines in the presence of alkenes and amines. J Org Chem 2003; 68:1067-74. [PMID: 12558436 DOI: 10.1021/jo026516d] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
beta-Aminoalkylanilines are smoothly obtained by irradiation of 4-chloro- and 4-fluoroanilines (as well as the N,N-dimethyl derivatives) in the presence of alkenes (1-hexene, cyclohexene) and amines (butylamine, piperidine) in polar, protic solvents such as trifluoroethanol (yield 40-75%). The reaction involves photoheterolysis of the haloaniline, addition of the resulting phenyl cation to the alkene and trapping of the phenonium cation by amine. A fraction (up to ca. 20%) of aminoalkylanilines resulting from Wagner-Meerwein rearrangement of the phenonium cation is obtained in some cases. Reduction and direct trapping of the phenyl cation by the amine compete with the above three-component synthesis in a less stabilizing solvent such as acetonitrile, but not in CF(3)CH(2)OH.
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Affiliation(s)
- Benedetta Guizzardi
- Department Organic Chemistry, University of Pavia, Via Taramelli 10, 27100 Pavia, Italy
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19
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Takagi J, Takahashi K, Ishiyama T, Miyaura N. Palladium-catalyzed cross-coupling reaction of bis(pinacolato)diboron with 1-alkenyl halides or triflates: convenient synthesis of unsymmetrical 1,3-dienes via the borylation-coupling sequence. J Am Chem Soc 2002; 124:8001-6. [PMID: 12095344 DOI: 10.1021/ja0202255] [Citation(s) in RCA: 242] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The synthesis of 1-alkenylboronic acid pinacol esters via a palladium-catalyzed cross-coupling reaction of bis(pinacolato)diboron (pin(2)B(2), pin = Me(4)C(2)O(2)) with 1-alkenyl halides or triflates was carried out in toluene at 50 degrees C in the presence of KOPh (1.5 equiv) and PdCl(2)(PPh(3))(2)-2Ph(3)P (3 mol %). The borylation of acyclic and cyclic 1-alkenyl bromides and triflates was achieved in high yields with complete retention of configuration of the double bonds. The method was applied to the one-pot synthesis of unsymmetrical 1,3-dienes via the borylation-coupling sequence.
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Affiliation(s)
- Jun Takagi
- Division of Molecular Chemistry, Graduate School of Engineering, Hokkaido University, Sapporo 060-8628, Japan
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20
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Bengtson A, Hallberg A, Larhed M. Fast synthesis of aryl triflates with controlled microwave heating. Org Lett 2002; 4:1231-3. [PMID: 11922826 DOI: 10.1021/ol025701a] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
[reaction: see text] Synthesis of aryl triflates from phenols using N-phenyltriflimide requires only 6 min for completion when conducted with controlled microwave heating. The methodology was applied to both solution- and solid-phase conditions. Ten different aryl triflates were synthesized and isolated in good yields. Applications in high-throughput chemistry are suggested.
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Affiliation(s)
- Anna Bengtson
- Department of Organic Pharmaceutical Chemistry, Uppsala University, BMC, Box-574, SE-751 23 Uppsala, Sweden
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21
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Guizzardi B, Mella M, Fagnoni M, Freccero M, Albini A. Generation and reactivity of the 4-aminophenyl cation by photolysis of 4-chloroaniline. J Org Chem 2001; 66:6353-63. [PMID: 11559186 DOI: 10.1021/jo0104680] [Citation(s) in RCA: 53] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
4-Chloroaniline and its N,N-dimethyl derivative are photostable in cyclohexane but undergo efficient photoheterolysis in polar media via the triplet state and give the corresponding triplet phenyl cations. CASSCF and UB3LYP calculations show that the 4-aminophenyl triplet cation has a planar geometry and is stabilized by >10 kcal mol(-1) with respect to the slightly bent singlet. The triplet has a mixed carbene-diradical character at the divalent carbon. This species either adds to the starting substrate forming 5-chloro-2,4'-diaminodiphenyls (via an intermediate cyclohexadienyl cation) or is reduced to the aniline (via the aniline radical cation) in a ratio depending on the hydrogen-donating properties of the solvent. Transients attributable to the triplet aminophenyl cation as well as to the ensuing intermediates are detected. Chemical evidence for the generation of the phenyl cation is given by trapping via electrophilic substitution with benzene, mesitylene, and hexamethylbenzene (in the last case the main product is a 6-aryl-3-methylene-1,4-cyclohexadiene). Relative rates of electrophilic attack to benzene and to some alkenes and five-membered heterocycles are measured and span over a factor of 15 or 30 for the two cations. The triplet cation formed under these conditions is trapped by iodide more efficiently than by the best pi nucleophiles. However, in contrast to the singlet cation, it does not form ethers with alcohols, by which it is rather reduced.
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Affiliation(s)
- B Guizzardi
- Department of Organic Chemistry, University of Pavia, Via Taramelli 10, 27100 Pavia, Italy
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Kelly TR, Silva RA, De Silva H, Jasmin S, Zhao Y. A Rationally Designed Prototype of a Molecular Motor. J Am Chem Soc 2000; 122:6935-6949. [PMID: 29857351 DOI: 10.1021/ja001048f] [Citation(s) in RCA: 150] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A proof of principle of the first rationally designed, chemically powered, molecular-scale motor is described. The thermodynamic considerations leading to the choice of 6a and 7a as the initial prototypes are provided, and the synthesis of 6a and 7a and the separation of them from their atropisomers are detailed. The phosgene-powered unidirectional rotation of 6a to its rotamer 6b is demonstrated. It is further established that shortening the length of the tether (→7a) changes the rate-limiting step and accelerates the speed of rotation.
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Affiliation(s)
- T Ross Kelly
- Contribution from the Department of Chemistry, E. F. Merkert Chemistry Center, Boston College, Chestnut Hill, Massachusetts 02467
| | - Richard A Silva
- Contribution from the Department of Chemistry, E. F. Merkert Chemistry Center, Boston College, Chestnut Hill, Massachusetts 02467
| | - Harshani De Silva
- Contribution from the Department of Chemistry, E. F. Merkert Chemistry Center, Boston College, Chestnut Hill, Massachusetts 02467
| | - Serge Jasmin
- Contribution from the Department of Chemistry, E. F. Merkert Chemistry Center, Boston College, Chestnut Hill, Massachusetts 02467
| | - Yajun Zhao
- Contribution from the Department of Chemistry, E. F. Merkert Chemistry Center, Boston College, Chestnut Hill, Massachusetts 02467
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Trost BM, Bunt RC, Lemoine RC, Calkins TL. Dynamic Kinetic Asymmetric Transformation of Diene Monoepoxides: A Practical Asymmetric Synthesis of Vinylglycinol, Vigabatrin, and Ethambutol. J Am Chem Soc 2000. [DOI: 10.1021/ja000547d] [Citation(s) in RCA: 211] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Barry M. Trost
- Contribution from the Department of Chemistry, Stanford University, Stanford, California 94305-5080
| | - Richard C. Bunt
- Contribution from the Department of Chemistry, Stanford University, Stanford, California 94305-5080
| | - Rémy C. Lemoine
- Contribution from the Department of Chemistry, Stanford University, Stanford, California 94305-5080
| | - Trevor L. Calkins
- Contribution from the Department of Chemistry, Stanford University, Stanford, California 94305-5080
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Baraznenok IL, Nenajdenko VG, Balenkova ES. Chemical Transformations Induced by Triflic Anhydride. Tetrahedron 2000. [DOI: 10.1016/s0040-4020(00)00093-4] [Citation(s) in RCA: 131] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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25
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Nishihara Y, Ando JI, Kato T, Mori A, Hiyama T. A Novel Cross-Coupling Polycondensation of Alkynylsilanes with Aryl Triflates Catalyzed by CuCl/Pd(PPh3)4. Macromolecules 2000. [DOI: 10.1021/ma9908301] [Citation(s) in RCA: 41] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Yasushi Nishihara
- Research Laboratory of Resources Utilization, Tokyo Institute of Technology, 4259 Nagatsuta, Yokohama 226-8503, Japan
| | - Jun-ichi Ando
- Research Laboratory of Resources Utilization, Tokyo Institute of Technology, 4259 Nagatsuta, Yokohama 226-8503, Japan
| | - Tsuyoshi Kato
- Research Laboratory of Resources Utilization, Tokyo Institute of Technology, 4259 Nagatsuta, Yokohama 226-8503, Japan
| | - Atsunori Mori
- Research Laboratory of Resources Utilization, Tokyo Institute of Technology, 4259 Nagatsuta, Yokohama 226-8503, Japan
| | - Tamejiro Hiyama
- Department of Material Chemistry, Graduate School of Engineering, Kyoto University, Yoshida, Sakyo-ku, Kyoto 606-8501, Japan
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Coupling Reactions of Alkynylsilanes Mediated by a Cu(I) Salt: Novel Syntheses of Conjugate Diynes and Disubstituted Ethynes. J Org Chem 2000; 65:1780-1787. [PMID: 10814151 DOI: 10.1021/jo991686k] [Citation(s) in RCA: 234] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Reaction of 1-trimethylsilylalkyne with copper(I) chloride in a polar solvent, DMF, at 60 degrees C under an aerobic conditions smoothly undergoes homo-coupling to give the corresponding symmetrical 1,3-butadiynes in 70-99% yields. In addition, (arylethynyl)trimethylsilanes are found to couple with aryl triflates and chlorides in the presence of Cu(I)/Pd(0) (10 mol %/5 or 10 mol %) cocatalyst system to give the corresponding diarylethynes in 49-99% yields. The cross-coupling reaction is applied to a one-pot synthesis of the corresponding unsymmetrical diarylethynes from (trimethylsilyl)ethyne via sequential Sonogashira-Hagihara and the present cross-coupling reactions using two different aryl triflates. The reactions of (arylethynyl)trimethylsilanes with aryl(chloro)ethynes in the presence of 10 mol % of CuCl also yield the corresponding unsymmetrical 1,3-butadiynes in 43-97% yields.
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27
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Crocker PJ, Saha B, Ryan WJ, Wiley JL, Martin BR, Ross RA, Pertwee RG, Razdan RK. Development of agonists, partial agonists and antagonists in the Δ8-Tetrahydrocannabinol series. Tetrahedron 1999. [DOI: 10.1016/s0040-4020(99)00849-2] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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28
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Harada T, Chiba M, Oku A. Novel Homologation Reaction of Arylzincates Bearing a Leaving Group at the Ortho and Meta Positions. J Org Chem 1999; 64:8210-8213. [PMID: 11674738 DOI: 10.1021/jo990937m] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Arylzincates bearing a leaving group at the ortho, meta, and para positions were generated by iodine/zinc exchange reaction of the corresponding iodoaryl sulfonates with Bu(3)ZnLi, and their reactivity was investigated via product analysis after hydrolysis and treatment with iodine. Zincates derived from o-iodophenyl triflates and tosylate underwent homologation reaction to give o-butylphenylzinc species. o-Benzyne as an intermediate of the reaction was demonstrated by the lack of regioselectivity for trisubstituted zincates. Zincates derived from m-iodophenyl triflates also underwent homologation leading to m-butylphenylzinc species. Similar product ratios observed in the reactions of regioisomeric trisubstituted iodophenyl triflates as well as the formation of radical reaction byproducts suggested the involvement of m-benzyne intermediate. p-(Trifluoromethanesulfonyloxy)phenylzincate was thermally stable at room temperature; generation of p-benzyne was not observed.
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Affiliation(s)
- Toshiro Harada
- Department of Chemistry, Kyoto Institute of Technology, Matsugasaki, Sakyo-ku, Kyoto 606-8585, Japan
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A high throughput synthesis of aryl triflate and aryl nonaflate promoted by a polymer supported base (PTBD). Tetrahedron Lett 1999. [DOI: 10.1016/s0040-4039(99)01529-4] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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Neuville L, Bigot A, Tran Huu Dau ME, Zhu J. 4-Nitrophenyltriflate and 4-Nitrophenylnonaflate as New Perfluoroalkanesulfonyl Transfer Agents: Experimental and Computational Studies. J Org Chem 1999. [DOI: 10.1021/jo990559l] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Luc Neuville
- Institut de Chimie des Substances Naturelles, CNRS, 91198 Gif-Sur-Yvette, France
| | - Antony Bigot
- Institut de Chimie des Substances Naturelles, CNRS, 91198 Gif-Sur-Yvette, France
| | | | - Jieping Zhu
- Institut de Chimie des Substances Naturelles, CNRS, 91198 Gif-Sur-Yvette, France
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Kubota H, Rice KC. Palladium-catalyzed cyanation of hindered, electron-rich aryl triflates by zinc cyanide. Tetrahedron Lett 1998. [DOI: 10.1016/s0040-4039(98)00414-6] [Citation(s) in RCA: 54] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Ishiyama T, Itoh Y, Kitano T, Miyaura N. Synthesis of arylboronates via the palladium(0)-catalyzed cross-coupling reaction of tetra(alkoxo)diborons with aryl triflates. Tetrahedron Lett 1997. [DOI: 10.1016/s0040-4039(97)00642-4] [Citation(s) in RCA: 245] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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Schottland EZ, Rappoport Z. Triflate/Mesylate Ratios and Competing C−O and S−O Bond Cleavages in Nucleophilic Vinylic Substitution. J Org Chem 1996. [DOI: 10.1021/jo961108t] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Ettie Z. Schottland
- Department of Organic Chemistry, The Hebrew University, Jerusalem 91904, Israel
| | - Zvi Rappoport
- Department of Organic Chemistry, The Hebrew University, Jerusalem 91904, Israel
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Kirmse W, Wonner A. Reaktionen Pentafluorethyl-substituierter Bicyclo[2.1.1]hexan-Derivate. ACTA ACUST UNITED AC 1993. [DOI: 10.1002/cber.19931260218] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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Imamoto T, Oshiki T, Onozawa T, Matsuo M, Hikosaka T, Yanagawa M. Synthesis and reactions of optically active phosphine-boranes. HETEROATOM CHEMISTRY 1992. [DOI: 10.1002/hc.520030519] [Citation(s) in RCA: 54] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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Effenberger F, Daub W. Darstellung von Didehydropyridinen aus (Trimethylsilyl)pyridinen. ACTA ACUST UNITED AC 1991. [DOI: 10.1002/cber.19911240939] [Citation(s) in RCA: 26] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Holweger W, Hanack M. Phenylkationen als reaktive Zwischenstufen bei der Solvolyse von Dien-in-yl-triflaten. ACTA ACUST UNITED AC 1984. [DOI: 10.1002/cber.19841171003] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Hanack M, Michel U. Formation of Phenyl Cations in the Sovolysis of a Dienynyl Trifluoromethanesulfonate. ACTA ACUST UNITED AC 1979. [DOI: 10.1002/anie.197908701] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Hanack M, Michel U. Entstehung von Phenylkationen bei der Solvolyse eines Dieninyl-trifluormethansulfonats. Angew Chem Int Ed Engl 1979. [DOI: 10.1002/ange.19790911116] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Atkinson JG, Wasson BK, Fuentes JJ, Girard Y, Rooney C, Engelhardt EL. Nucleophilic displacement of activated aryl triflates a new synthesis of oxindoles and arylacetic acids. Tetrahedron Lett 1979. [DOI: 10.1016/s0040-4039(01)86434-0] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Hanack M, Bentz H, Märkl R, Subramanian LR. Solvolyse gespannter cyclischer Vinyltrifluormethansulfonate. ACTA ACUST UNITED AC 1978. [DOI: 10.1002/jlac.197819781203] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Zollinger H. Stickstoff als Abgangsgruppe: Dediazonierungen aromatischer Diazonium-Ionen. Angew Chem Int Ed Engl 1978. [DOI: 10.1002/ange.19780900304] [Citation(s) in RCA: 36] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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