1151
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Yao X, Li CJ. Phosphine-Triggered Complete Chemo-Switch: From Efficient Aldehyde−Alkyne−Amine Coupling to Efficient Aldehyde−Alkyne Coupling in Water. Org Lett 2005; 7:4395-8. [PMID: 16178542 DOI: 10.1021/ol051575+] [Citation(s) in RCA: 115] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
[reaction: see text] A phosphine ligand served as a remarkable chemo-switch for the silver-catalyzed reaction of alkynes with aldehydes in the presence of amines in water. Exclusive aldehyde-alkyne-amine coupling product was observed in the absence of phosphine, whereas in the presence of a phosphine ligand, exclusive aldehyde-alkyne coupling product was obtained.
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Affiliation(s)
- Xiaoquan Yao
- Department of Chemistry, McGill University, 801 Sherbrooke Street West, Montreal, Quebec H3A 2K6, Canada
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1152
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1153
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Liu PN, Gu PM, Deng JG, Tu YQ, Ma YP. Efficient Heterogeneous Asymmetric Transfer Hydrogenation Catalyzed by Recyclable Silica-Supported Ruthenium Complexes. European J Org Chem 2005. [DOI: 10.1002/ejoc.200500074] [Citation(s) in RCA: 72] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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1154
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Porzelle A, Fessner WD. Reversible Substrate Anchoring: NC-SPOS as a Sustainable Approach to Solid-Supported Organic Synthesis. Angew Chem Int Ed Engl 2005. [DOI: 10.1002/ange.200462278] [Citation(s) in RCA: 3] [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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1155
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Hamamoto H, Suzuki Y, Yamada YMA, Tabata H, Takahashi H, Ikegami S. A Recyclable Catalytic System Based on a Temperature-Responsive Catalyst. Angew Chem Int Ed Engl 2005; 44:4536-8. [PMID: 15968694 DOI: 10.1002/anie.200500574] [Citation(s) in RCA: 100] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Hiromi Hamamoto
- School of Pharmaceutical Sciences, Teikyo University, Sagamiko, Kanagawa, 199-0195, Japan
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1156
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Hamamoto H, Suzuki Y, Yamada YMA, Tabata H, Takahashi H, Ikegami S. A Recyclable Catalytic System Based on a Temperature-Responsive Catalyst. Angew Chem Int Ed Engl 2005. [DOI: 10.1002/ange.200500574] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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1157
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Scarso A, Strukul G. Asymmetric Sulfoxidation of Thioethers with Hydrogen Peroxide in Water Mediated by Platinum Chiral Catalyst. Adv Synth Catal 2005. [DOI: 10.1002/adsc.200505030] [Citation(s) in RCA: 54] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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1158
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Li HJ, Tian HY, Wu YC, Chen YJ, Liu L, Wang D, Li CJ. Aqueous Asymmetric Mukaiyama Aldol Reaction Catalyzed by Chiral Gallium Lewis Acid with Trost-Type Semi-Crown Ligands. Adv Synth Catal 2005. [DOI: 10.1002/adsc.200505089] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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1159
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Teimouri MB, Mivehchi H. Efficient Hexamethylenetetramine‐Bromine (HMTAB)‐Catalyzed Synthesis of Bis(indolyl)methanes in Water. SYNTHETIC COMMUN 2005. [DOI: 10.1081/scc-200063977] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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1160
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Wang ZX, Qin HL. Reaction of 1,3-dicarbonyl compounds witho-phenylenediamine or 3,3′-diaminobenzidine in water or under solvent-free conditions via microwave irradiation. J Heterocycl Chem 2005. [DOI: 10.1002/jhet.5570420540] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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1161
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Kwong FY, Li YM, Lam WH, Qiu L, Lee HW, Yeung CH, Chan KS, Chan ASC. Rhodium-Catalyzed Asymmetric Aqueous Pauson-Khand-Type Reaction. Chemistry 2005; 11:3872-80. [PMID: 15827980 DOI: 10.1002/chem.200401237] [Citation(s) in RCA: 66] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
An interesting rhodium-catalyzed asymmetric aqueous Pauson-Khand-type reaction was developed. A chiral atropisomeric dipyridyldiphosphane ligand was found to be highly effective in this system. This operationally simple protocol allows both catalyst and reactants to be handled under air without precautions. Various enynes were transformed to the corresponding bicyclic cyclopentenones in good yield and enantiomeric excess (up to 95 % ee). A study of the electronic effects of the enyne substrates revealed a correlation between the electronic properties of the substrates and the ee value obtained in the product of the Pauson-Khand-type reaction. A linear free-energy relationship was observed from a Hammett study.
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Affiliation(s)
- Fuk Yee Kwong
- Open Laboratory of Chirotechnology of the Institute of Molecular Technology for Drug Discovery and Synthesis, Department of Applied Biology and Chemical Technology, Hong Kong Polytechnic University, Hung Hom, Hong Kong.
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1162
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Liang B, Huang M, You Z, Xiong Z, Lu K, Fathi R, Chen J, Yang Z. Pd-Catalyzed Copper-Free Carbonylative Sonogashira Reaction of Aryl Iodides with Alkynes for the Synthesis of Alkynyl Ketones and Flavones by Using Water as a Solvent. J Org Chem 2005; 70:6097-100. [PMID: 16018709 DOI: 10.1021/jo050498t] [Citation(s) in RCA: 170] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The Pd-catalyzed copper-free carbonylative Sonogashira coupling reaction to synthesize alkynyl ketones from terminal alkynes and aryl iodides was achieved by using water as a solvent. The reaction was carried out at room temperature under balloon pressure of CO with Et(3)N as a base. The developed method was successfully applied to the synthesis of flavones.
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Affiliation(s)
- Bo Liang
- Key Laboratory of Bioorganic Chemistry and Molecular Engineering, Ministry of Education, College of Chemistry, School of Pharmaceutical Science, ShenZhen Graduate School, Peking University, Beijing 100871, China
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1163
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Vriezema DM, Comellas Aragonès M, Elemans JAAW, Cornelissen JJLM, Rowan AE, Nolte RJM. Self-assembled nanoreactors. Chem Rev 2005; 105:1445-89. [PMID: 15826017 DOI: 10.1021/cr0300688] [Citation(s) in RCA: 1143] [Impact Index Per Article: 60.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Affiliation(s)
- Dennis M Vriezema
- Department of Organic Chemistry, Institute for Molecules and Materials, Radboud University Nijmegen, Toernooiveld 1, 6525ED Nijmegen, The Netherlands
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1164
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Wu X, Li X, King F, Xiao J. Insight into and Practical Application of pH-Controlled Asymmetric Transfer Hydrogenation of Aromatic Ketones in Water. Angew Chem Int Ed Engl 2005. [DOI: 10.1002/ange.200500023] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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1165
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Wu X, Li X, King F, Xiao J. Insight into and Practical Application of pH-Controlled Asymmetric Transfer Hydrogenation of Aromatic Ketones in Water. Angew Chem Int Ed Engl 2005; 44:3407-11. [PMID: 15852430 DOI: 10.1002/anie.200500023] [Citation(s) in RCA: 166] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Xiaofeng Wu
- Liverpool Centre for Materials and Catalysis, Department of Chemistry, University of Liverpool, Liverpool L69 7ZD, UK
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1166
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Narayan S, Muldoon J, Finn MG, Fokin VV, Kolb HC, Sharpless KB. “On Water”: Unique Reactivity of Organic Compounds in Aqueous Suspension. Angew Chem Int Ed Engl 2005. [DOI: 10.1002/ange.200462883] [Citation(s) in RCA: 266] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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1167
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Alcaide B, Almendros P, Rodríguez-Acebes R. Metal-mediated entry to functionalized 3-substituted 3-hydroxyindolin-2-ones via regiocontrolled carbonylallylation, bromoallylation, 1,3-butadien-2-ylation, propargylation, or allenylation reactions of isatins in aqueous media. J Org Chem 2005; 70:3198-204. [PMID: 15822982 DOI: 10.1021/jo050130w] [Citation(s) in RCA: 65] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Reactions of 2,3-indolinediones (isatins) with stabilized organometallic reagents were investigated in aqueous media. Isatins and a variety of stabilized organic halides undergo coupling under Barbier-type conditions in the presence of different metals (indium, tin, zinc) and additives (ammonium chloride, hydrobromic acid, bismuth(III) chloride, hafnium(IV) chloride). The regiochemistry of the processes (carbonylallylation, bromoallylation, 1,3-butadien-2-ylation, propargylation, or allenylation reactions) were generally excellent. On this basis, simple and fast protocols for the synthesis of the potentially bioactive 3-substituted 3-hydroxyoxindole moiety were developed.
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Affiliation(s)
- Benito Alcaide
- Departamento de Química Orgánica I, Facultad de Química, Universidad Complutense de Madrid, 28040-Madrid, Spain
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1168
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1169
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Xi C, Jiang Y, Yang X. Remarkably efficient oxidative coupling of N,N-dialkylarylamines in water mediated by cerium(IV) ammonium nitrate. Tetrahedron Lett 2005. [DOI: 10.1016/j.tetlet.2005.03.173] [Citation(s) in RCA: 49] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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1170
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Zha Z, Hui A, Zhou Y, Miao Q, Wang Z, Zhang H. A Recyclable Electrochemical Allylation in Water. Org Lett 2005; 7:1903-5. [PMID: 15876015 DOI: 10.1021/ol050483h] [Citation(s) in RCA: 53] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
To develop environmentally benign processes for C-C bond formation, electrochemistry is applied in a tin-mediated allylation reaction in water. In this electrochemical process, the corresponding homoallylic alcohols are prepared in excellent yields, while both tin salt and water can be recycled and electrode materials are not consumed.
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Affiliation(s)
- Zhenggen Zha
- Hefei National Laboratory for Physical Science at Microscale and Department of Chemistry, University of Science and Technology of China
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1171
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Alcaide B, Almendros P, Rodríguez-Acebes R. Novel Carbonyl Bromoallylation/Heck Reaction Sequence. Stereocontrolled Access to Bicyclic β-Lactams. J Org Chem 2005; 70:2713-9. [PMID: 15787564 DOI: 10.1021/jo0478306] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
[reaction: see text] The reaction of 2,3-dibromopropene with racemic as well as enantiopure 4-oxoazetidine-2-carbaldehydes 1 in aqueous media was promoted by tin in the presence of several additives to afford the corresponding bromohomoallyl alcohols 2 in high diastereoselectivities. However, indium or zinc were unable to promote the bromoallylation reaction of aldehydes 1 under similar Barbier-type conditions. Vinyl bromides 2 bearing an extra alkene tether were used for the preparation of differently sized, fused bicyclic beta-lactams of nonconventional structure via Heck cyclization.
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Affiliation(s)
- Benito Alcaide
- Departamento de Química Orgánica I, Facultad de Química, Universidad Complutense de Madrid, 28040 Madrid, Spain.
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1172
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1173
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Mlynarski J, Jankowska J. Asymmetric Mukaiyama-Aldol Reaction in Aqueous Media Promoted by Zinc-Based Chiral Lewis Acids. Adv Synth Catal 2005. [DOI: 10.1002/adsc.200404314] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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1174
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Abstract
The Suzuki cross-coupling reaction is a very efficient, reliable, and environmentally friendly method for the introduction of novel carboncarbon bonds into molecules. This review summarizes recent advances in the use of the reaction in aqueous media with a focus on different types of ligands and the ligandless protocols currently in use. Several synthetic targets for the reaction have been mentioned. The work summarizes recent results from studies on asymmetric Suzuki reactions performed in organic aqueous mixed solvents.Key words: Suzuki reaction, green chemistry, metal-catalyzed cross-coupling reactions, aqueous synthesis media.
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1175
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Zha Z, Qiao S, Jiang J, Wang Y, Miao Q, Wang Z. Barbier-type reaction mediated with tin nano-particles in water. Tetrahedron 2005. [DOI: 10.1016/j.tet.2004.12.063] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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1176
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Substrate dependence in aqueous Diels-Alder reactions of cyclohexadiene derivatives with 1,4-benzoquinone. Molecules 2005; 10:244-50. [PMID: 18007292 PMCID: PMC6147714 DOI: 10.3390/10010244] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2004] [Revised: 11/25/2004] [Accepted: 11/25/2004] [Indexed: 11/17/2022] Open
Abstract
A reactivity difference based on the position of substituents on cyclohexa-1,3-diene was observed for the title reaction. The effect of water as solvent was more distinct for 1-methyl-4-isopropylcyclohexa-1,3-diene than for 2-methyl-5-isopropylcyclohexa-1,3-diene or non-substituted cyclohexa-1,3-diene. The effect of NaCl (salting-out) and guanidium chloride (salting-in) was also large for 1-methyl-4-isopropylcyclohexa-1,3-diene.
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1177
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Gogoi P, Hazarika P, Konwar D. Surfactant/I2/Water: An Efficient System for Deprotection of Oximes and Imines to Carbonyls under Neutral Conditions in Water. J Org Chem 2005; 70:1934-6. [PMID: 15730327 DOI: 10.1021/jo0480287] [Citation(s) in RCA: 64] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
I2/surfactant/water system deprotecting oximes and imines to the corresponding carbonyl compounds under neutral conditions in water at 25-40 degrees C with very high to excellent yields.
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Affiliation(s)
- Pranjal Gogoi
- Organic Chemistry Division, Regional Research Laboratory, Jorhat-785006, Assam, India
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1178
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Nicolaou KC, Xu H, Wartmann M. Biomimetic Total Synthesis of Gambogin and Rate Acceleration of Pericyclic Reactions in Aqueous Media. Angew Chem Int Ed Engl 2005. [DOI: 10.1002/ange.200462211] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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1179
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Nicolaou KC, Xu H, Wartmann M. Biomimetic Total Synthesis of Gambogin and Rate Acceleration of Pericyclic Reactions in Aqueous Media. Angew Chem Int Ed Engl 2005; 44:756-61. [PMID: 15657969 DOI: 10.1002/anie.200462211] [Citation(s) in RCA: 82] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- K C Nicolaou
- Department of Chemistry and Skaggs Institute for Chemical Biology, Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA 92037, USA.
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1180
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Candeias NR, Gois PMP, Afonso CAM. Rh(ii) catalysed intramolecular C–H insertion of diazo substrates in water: a simple and efficient approach to catalyst reuse. Chem Commun (Camb) 2005:391-3. [PMID: 15645048 DOI: 10.1039/b414233k] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Water is an efficient solvent for the Rh2(OAc)4 catalysed intramolecular C-H insertion of a range of diazo substrates without competitive water insertion. Due to the high solubility and stability of the catalyst in water, the catalyst can be efficiently reused.
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Affiliation(s)
- Nuno R Candeias
- REQUIMTE/CQFB Departmento de Química, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, 2829-516, Caparica, Portugal
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1181
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Lindström UM, Ding R, Hidestål O. Efficient asymmetric synthesis of an azasugar in water. Chem Commun (Camb) 2005:1773-4. [PMID: 15791328 DOI: 10.1039/b500190k] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
An extremely efficient asymmetric synthesis of a pyrrolidine azasugar was completed in only four steps in water, without the use of protecting groups and in 60% overall yield from a simple, achiral bis-electrophile.
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Affiliation(s)
- Ulf M Lindström
- Department of Organic Chemistry, Lund University, P. O. Box 124, SE-221 00, Sweden.
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1182
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Barluenga J, Trincado M, Marco-Arias M, Ballesteros A, Rubio E, González JM. Intramolecular iodoarylation reaction of alkynes: easy access to derivatives of benzofused heterocycles. Chem Commun (Camb) 2005:2008-10. [PMID: 15834488 DOI: 10.1039/b500303b] [Citation(s) in RCA: 89] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The iodoarylation reaction of heteroatom-tethered omega-arylalkynes offers an efficient and straightforward entry to heterocycles. As a result, both C-C ring-closing from readily available precursors, and concomitant selective iodination take place. The first related study conducted in water is presented.
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Affiliation(s)
- José Barluenga
- Instituto Universitario de Química Organometálica Enrique Moles-Unidad Asociada al C.S.I.C., Universidad de Oviedo, C/Julián Claveria, 8, 33006-Oviedo, Spain.
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1183
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Zhuang W, Marigo M, Jørgensen KA. Organocatalytic asymmetric epoxidation reactions in water–alcohol solutions. Org Biomol Chem 2005; 3:3883-5. [PMID: 16240003 DOI: 10.1039/b512542a] [Citation(s) in RCA: 95] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The diastereo- and enantioselective organocatalytic epoxidation of alpha,beta-unsaturated aldehydes in aqueous solutions is presented. By the screening of the reaction conditions for the epoxidation of cinnamic aldehyde applying hydrogen peroxide as the oxidant and 2-[bis-(3,5-bis-trifluoromethyl-phenyl)-trimethylsilanyloxy-methyl]-pyrrolidine as the catalyst, a highly stereoselective reaction has been developed. The scope of the diastereo- and enantioselective organocatalytic epoxidation in aqueous solutions is documented by the asymmetric epoxidation of alpha,beta-unsaturated aldehydes with enantioselectivities up to 96% ee.
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Affiliation(s)
- Wei Zhuang
- Danish National Research Foundation: Center for Catalysis, Department of Chemistry, Aarhus University, DK-8000, Aarhus C, Denmark
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1184
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Kobayashi S, Hirano K, Sugiura M. α-Aminoallylation of aldehydes in aqueous ammonia. Chem Commun (Camb) 2005:104-6. [PMID: 15614387 DOI: 10.1039/b415264f] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
alpha-Aminoallylation of aldehydes in aqueous ammonia has been developed; commercial aqueous ammonia was successfully used, and this method does not require anhydrous conditions thus leading to easy and practical operations.
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Affiliation(s)
- Shu Kobayashi
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan.
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1185
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Azizian J, Mohammadizadeh MR, Karimi N, Kazemizadeh Z, Mohammadi AA, Karimi AR. One-pot three components synthesis of alkyl indeno [1,2-b]-quinoxalin-11-ylideneacetates in water and under solvent-free conditions. HETEROATOM CHEMISTRY 2005. [DOI: 10.1002/hc.20136] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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1186
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Bourhani Z, Malkov AV. Ligand-accelerated vanadium-catalysed epoxidation in water. Chem Commun (Camb) 2005:4592-4. [PMID: 16158125 DOI: 10.1039/b509436d] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Vanadium-catalysed epoxidation of allylic alcohols, a classical example of ligand-decelerated catalysis, in water it turns into a ligand-accelerated process.
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Affiliation(s)
- Zaïnaba Bourhani
- WestChem, Department of Chemistry, Joseph Black Building, University of Glasgow, Glasgow, Scotland, UKG12 8QQ
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1187
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Alternative protocol for oxidation in water: an effective epoxidation system promoted by the combination of Oxone® and an amphiphilic ketone. Tetrahedron Lett 2005. [DOI: 10.1016/j.tetlet.2004.11.069] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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1188
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Cadierno V, García-Garrido SE, Gimeno J, Nebra N. Ru(iv)-catalyzed isomerization of allylamines in water: A highly efficient procedure for the deprotection of N-allylic amines. Chem Commun (Camb) 2005:4086-8. [PMID: 16091808 DOI: 10.1039/b506788j] [Citation(s) in RCA: 55] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A general and efficient method for the deprotection of N-allylic substrates in aqueous media, using catalytic amounts of the bis(allyl)-ruthenium(IV) complexes [Ru(eta3:eta2:eta3-C12H18)Cl2] and [{Ru(eta3:eta3-C10H16)(micro-Cl)Cl}2], has been developed.
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Affiliation(s)
- Victorio Cadierno
- Departamento de Química Orgánica e Inorgánica, Instituto Universitario de Química Organometálica Enrique Moles (Unidad Asociada al C.S.I.C.), Universidad de Oviedo, 33071, Oviedo, Spain.
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1189
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Gogoi P, Konwar D. Transition-metal- and organic-solvent-free: a highly efficient anaerobic process for selective oxidation of alcohols to aldehydes and ketones in water. Org Biomol Chem 2005; 3:3473-5. [PMID: 16172681 DOI: 10.1039/b509527a] [Citation(s) in RCA: 55] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A new system, I2-KI-K2CO3-H2O, selectively oxidized alcohols to aldehydes and ketones under anaerobic condition in water at 90 degrees C with excellent yields. The process is green, mild and inexpensive.
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Affiliation(s)
- Pranjal Gogoi
- Organic Chemistry Division, Regional Research Laboratory, Jorhat, 785006, Assam, India
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1190
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Zhang ZH, Yin L, Li Y, Wang YM. A practical and efficient procedure for the cleavage of acylals to aldehydes catalyzed by indium tribromide in water. Tetrahedron Lett 2005. [DOI: 10.1016/j.tetlet.2004.11.161] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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1191
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Salehi H, Guo Q. Synthesis of Substituted 1,4‐Dihydropyridines in Water Using Phase‐Transfer Catalyst Under Microwave Irradiation. SYNTHETIC COMMUN 2004. [DOI: 10.1081/scc-200039409] [Citation(s) in RCA: 49] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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1192
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An environmentally friendly α-hydroxyallylation reaction of the Garner aldehyde: a comparative assessment of alternative Barbier conditions. Tetrahedron 2004. [DOI: 10.1016/j.tet.2004.10.007] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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1193
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Yang J, Wang Y, Rassat A, Zhang Y, Sinaÿ P. Synthesis of novel highly water-soluble 2:1 cyclodextrin/fullerene conjugates involving the secondary rim of β-cyclodextrin. Tetrahedron 2004. [DOI: 10.1016/j.tet.2004.10.015] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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1194
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Wu YS, Cai J, Hu ZY, Lin GX. A new class of metal-free catalysts for direct diastereo- and regioselective Mannich reactions in aqueous media. Tetrahedron Lett 2004. [DOI: 10.1016/j.tetlet.2004.09.174] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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1195
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Kida T, Kajihara K, Isogawa K, Zhang W, Nakatsuji Y, Ikeda I, Akashi M. Sugar-amide surfactant micelles as effective reaction fields for enantioselective hydrolysis of alpha-amino acid esters. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2004; 20:8504-8509. [PMID: 15379467 DOI: 10.1021/la0489662] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
The enantioselective hydrolysis of p-nitrophenyl esters of alpha-amino acids (Phe, Leu, Ala) was accomplished in micelles formed with the surfactants bearing one or two sugar-amide headgroups. The effect of structural variations in such sugar-amide surfactants on the rates and enantioselectivity (kD/kL) for hydrolysis of p-nitrophenyl esters of D- and L-phenylalanine hydrogen bromides (D- and L-PheONp) was studied. Both the hydrolysis rate of D-PheONp and the enantioselectivity increased with an increase in the alkyl chain length as well as an increase in the number of the alkyl chains in the maltobionamide-type surfactants. Enantioselectivity also increased with an increase in the sugar chain length from bisgluconamide to bismaltobionamide (by one glucose unit per each sugar chain) in the double-sugar-chain surfactants, but enantioselectivity was no longer influenced by a further increase to bismaltotrionamide. The stereochemistry of the linkage between the sugar units in the sugar chain remarkably affected the enantioselectivity: the maltobionamide-type surfactant, in which the two sugar units are connected by an alpha-1,4-glucosidic linkage, showed high enantioselectivity (kD/kL = 5.5), whereas the surfactant bearing cellobionamide headgroups (beta-1,4-glucosidic linkage) showed no enantioselectivity. Similar trends were observed when p-nitrophenyl esters of D- and L-leucine hydrogen bromides were used as substrates. On the other hand, the rates and enantioselectivity for hydrolysis of p-nitrophenyl esters of D- and L-alanine hydrogen bromides were not so largely affected by the structural variations in the sugar-amide surfactants. Additionally, the effects of the surfactant concentration and the reaction temperature on the rates and enantioselectivity for the hydrolysis of D- and L-PheONp were examined.
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Affiliation(s)
- Toshiyuki Kida
- Department of Molecular Chemistry, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, 565-0871, Japan
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1196
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Otomaru Y, Senda T, Hayashi T. Preparation of an Amphiphilic Resin-Supported BINAP Ligand and Its Use for Rhodium-Catalyzed Asymmetric 1,4-Addition of Phenylboronic Acid in Water. Org Lett 2004; 6:3357-9. [PMID: 15355051 DOI: 10.1021/ol048695m] [Citation(s) in RCA: 66] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
[reaction: see text] The axially chiral bisphosphine ligand, 2,2'-bis(diphenylphosphino)-1,1'-binaphthyl (binap), was supported on a polystyrene-poly(ethylene glycol) copolymer (PS-PEG) resin and was used successfully for the rhodium-catalyzed asymmetric 1,4-addition of phenylboronic acid to alpha,beta-unsaturated ketones in water.
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Affiliation(s)
- Yusuke Otomaru
- Department of Chemistry, Graduate School of Science, Kyoto University, Sakyo, Kyoto 606-8502, Japan
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1197
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Xia C, Xu J, Wu W, Liang X. Pd/C-catalyzed hydrodehalogenation of aromatic halides in aqueous solutions at room temperature under normal pressure. CATAL COMMUN 2004. [DOI: 10.1016/j.catcom.2004.04.006] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
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1198
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Sato S, Sakamoto T, Miyazawa E, Kikugawa Y. One-pot reductive amination of aldehydes and ketones with α-picoline-borane in methanol, in water, and in neat conditions. Tetrahedron 2004. [DOI: 10.1016/j.tet.2004.06.045] [Citation(s) in RCA: 160] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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1199
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Tan XH, Hou YQ, Huang C, Liu L, Guo QX. SnCl2-mediated carbonyl allylation in fully aqueous media. Tetrahedron 2004. [DOI: 10.1016/j.tet.2004.05.046] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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1200
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Hayashi H, Nishida H, Ogo S, Fukuzumi S. Synthesis and crystal structures of water-soluble rhodium(III) complexes with 1,4,7-triazacyclononane and 2,2′-bipyridine supporting ligands. Inorganica Chim Acta 2004. [DOI: 10.1016/j.ica.2004.03.001] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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