1
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Lu T, Zhang X, Miao Z. Synthesis of methylene cyclopropane-fused chromenes and dihydroquinolines by sequential [4 + 2]- and [1 + 2]-annulation. Org Biomol Chem 2020; 18:3303-3311. [DOI: 10.1039/d0ob00389a] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A base promoted sequential [4 + 2]- and [1 + 2]-annulation of 2-hydroxychalcones or 2-tosylaminochalcones with prop-2-ynylsulfonium salts was developed.
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Affiliation(s)
- Tianyu Lu
- State Key Laboratory and Institute of Elemento-Organic Chemistry
- College of Chemistry
- Nankai University
- Tianjin 300071
- China
| | - Xuange Zhang
- State Key Laboratory and Institute of Elemento-Organic Chemistry
- College of Chemistry
- Nankai University
- Tianjin 300071
- China
| | - Zhiwei Miao
- State Key Laboratory and Institute of Elemento-Organic Chemistry
- College of Chemistry
- Nankai University
- Tianjin 300071
- China
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2
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Synthesis of phosphine-containing novel Pd(II) and Ni(II) complexes: Electrochemical, photophysical and quantum chemical studies. J Mol Struct 2019. [DOI: 10.1016/j.molstruc.2019.126889] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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3
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Hashemi MS, Sabounchei SJ, Karamian R, Moazzami Farida SH, Rahmani N, Roushani M, Van Hecke K. Pd(II) and Pt(II) Metallacycles with Unsymmetrical Ylide: Antiproliferative Effects and Application in Electrocatalytic Oxidation of Methanol. ChemistrySelect 2019. [DOI: 10.1002/slct.201902065] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
| | | | - Roya Karamian
- Department of BiologyFaculty of ScienceBu-Ali Sina University P. O. Box 65175/4161 Hamedan Iran
| | | | - Nosrat Rahmani
- Department of BiologyFaculty of ScienceShahed University, Tehran Iran
| | - Mahmoud Roushani
- Department of ChemistryFaculty of SciencesIlam University Ilam 69315516 Iran
| | - Kristof Van Hecke
- XStructDepartment of ChemistryGhent University Krijgslaan 281-S3, B-9000 Ghent Belgium
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4
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Devi SP, Lyngdoh RHD. Uncatalyzed gas phase aziridination of alkenes by organic azides. Part 2. Whole azide reaction with alkene. J CHEM SCI 2019. [DOI: 10.1007/s12039-018-1575-4] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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5
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Xiang Y, Fan X, Cai PJ, Yu ZX. Understanding Regioselectivities of Corey-Chaykovsky Reactions of Dimethylsulfoxonium Methylide (DMSOM) and Dimethylsulfonium Methylide (DMSM) toward Enones: A DFT Study. European J Org Chem 2018. [DOI: 10.1002/ejoc.201801216] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Yu Xiang
- Beijing National Laboratory for Molecular Sciences (BNLMS); Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of Education; College of Chemistry; Peking University; 100871 Beijing China
| | - Xing Fan
- Beijing National Laboratory for Molecular Sciences (BNLMS); Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of Education; College of Chemistry; Peking University; 100871 Beijing China
| | - Pei-Jun Cai
- Beijing National Laboratory for Molecular Sciences (BNLMS); Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of Education; College of Chemistry; Peking University; 100871 Beijing China
| | - Zhi-Xiang Yu
- Beijing National Laboratory for Molecular Sciences (BNLMS); Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of Education; College of Chemistry; Peking University; 100871 Beijing China
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6
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Sabounchei SJ, Sedghi A, Hashemi A, Hosseinzadeh M, Bayat M, Gable RW. Pallada- and platinacycle complexes of phosphorus ylides; synthesis, X-ray characterization, theoretical and electrochemical studies and application of Pd(II) complexes as catalyst in Suzuki-Miyaura coupling reaction. Appl Organomet Chem 2017. [DOI: 10.1002/aoc.3850] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
| | - Asieh Sedghi
- Faculty of Chemistry; Bu-Ali Sina University; Hamedan 65174 Iran
| | - Ali Hashemi
- Faculty of Chemistry; Bu-Ali Sina University; Hamedan 65174 Iran
| | | | - Mehdi Bayat
- Faculty of Chemistry; Bu-Ali Sina University; Hamedan 65174 Iran
| | - Robert W. Gable
- School of Chemistry; University of Melbourne; Victoria 3010 Australia
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7
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Javad Sabounchei S, Hashemi A, Yousefi A, Gohari Derakhshandeh P, Karamian R, Asadbegy M, Van Hecke K. New pallada- and platinacycle complexes of phosphorus ylide: Synthesis, structural characterization, antioxidant capacity and catalytic behavior towards Mizoroki-Heck reactions. Polyhedron 2017. [DOI: 10.1016/j.poly.2017.06.043] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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8
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Meng XS, Jiang S, Xu XY, Wu QX, Gu YC, Shi DQ. Stabilized Sulfur Ylide Mediated Cyclopropanations and Formal [4+1] Cycloadditions of 3-Acyl-2H-chromenones and Their Imines. European J Org Chem 2016. [DOI: 10.1002/ejoc.201600759] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Xiang-Suo Meng
- Key Laboratory of Pesticide & Chemical Biology; Ministry of Education; College of Chemistry; 152 Luoyu Road 430079 Wuhan, Hubei China
| | - Shan Jiang
- Key Laboratory of Pesticide & Chemical Biology; Ministry of Education; College of Chemistry; 152 Luoyu Road 430079 Wuhan, Hubei China
| | - Xiao-Yun Xu
- Key Laboratory of Pesticide & Chemical Biology; Ministry of Education; College of Chemistry; 152 Luoyu Road 430079 Wuhan, Hubei China
| | - Qiang-Xian Wu
- Key Laboratory of Pesticide & Chemical Biology; Ministry of Education; College of Chemistry; 152 Luoyu Road 430079 Wuhan, Hubei China
| | - Yu-Cheng Gu
- Syngenta Jealott's Hill International Research Centre; Bracknell RG42 6EY Berkshire UK
| | - De-Qing Shi
- Key Laboratory of Pesticide & Chemical Biology; Ministry of Education; College of Chemistry; 152 Luoyu Road 430079 Wuhan, Hubei China
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9
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Synthesis and structural characterization of dimeric phosphine ylide Cu(I) complexes: Application in Suzuki cross-coupling reactions and biological evaluation as antibacterial agents. J Organomet Chem 2014. [DOI: 10.1016/j.jorganchem.2014.03.017] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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10
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Theoretical studies of n-membered ring chelate complexes of Ni(II), Pd(II) and Pt(II) derived from bidentate phosphorus ylides. Polyhedron 2014. [DOI: 10.1016/j.poly.2014.01.029] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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11
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Sabounchei SJ, Pourshahbaz M, Ahmadi M, Hashemi A, Khavasi HR. New dimeric phosphine ylide copper (I) complexes: Synthesis, coordination behavior, and application in Suzuki cross-coupling reactions. INORG CHEM COMMUN 2013. [DOI: 10.1016/j.inoche.2013.08.010] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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12
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Illa O, Namutebi M, Saha C, Ostovar M, Chen CC, Haddow MF, Nocquet-Thibault S, Lusi M, McGarrigle EM, Aggarwal VK. Practical and highly selective sulfur ylide-mediated asymmetric epoxidations and aziridinations using a cheap and readily available chiral sulfide: extensive studies to map out scope, limitations, and rationalization of diastereo- and enantioselectivities. J Am Chem Soc 2013; 135:11951-66. [PMID: 23902598 DOI: 10.1021/ja405073w] [Citation(s) in RCA: 83] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
The chiral sulfide, isothiocineole, has been synthesized in one step from elemental sulfur, γ-terpinene, and limonene in 61% yield. A mechanism involving radical intermediates for this reaction is proposed based on experimental evidence. The application of isothiocineole to the asymmetric epoxidation of aldehydes and the aziridination of imines is described. Excellent enantioselectivities and diastereoselectivities have been obtained over a wide range of aromatic, aliphatic, and α,β-unsaturated aldehydes using simple protocols. In aziridinations, excellent enantioselectivities and good diastereoselectivities were obtained for a wide range of imines. Mechanistic models have been put forward to rationalize the high selectivities observed, which should enable the sulfide to be used with confidence in synthesis. In epoxidations, the degree of reversibility in betaine formation dominates both the diastereoselectivity and the enantioselectivity. Appropriate tuning of reaction conditions based on understanding the reaction mechanism enables high selectivities to be obtained in most cases. In aziridinations, betaine formation is nonreversible with semistabilized ylides and diastereoselectivities are determined in the betaine forming step and are more variable as a result.
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Affiliation(s)
- Ona Illa
- School of Chemistry, University of Bristol, Cantock's Close BS8 1TS, United Kingdom
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13
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Jaccob M, Venuvanalingam P. Mechanism and diastereoselectivity of arsenic ylide mediated cyclopropanation: a theoretical study. RSC Adv 2013. [DOI: 10.1039/c3ra42064g] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023] Open
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14
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Rajeev R, Sunoj RB. On the origin of regio- and stereoselectivity in singlet oxygen addition to enecarbamates. J Org Chem 2012; 77:2474-85. [PMID: 22324308 DOI: 10.1021/jo3001707] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
The reactions of excited state singlet molecular oxygen ((1)Δ(g),(1)O(2)) continue to witness interesting new developments. In the most recent manifestation, (1)O(2) is tamed to react with enecarbamates in a stereoselective manner, which is remarkable, in view of its inherently high reactivity (Acc. Chem. Res. 2008, 41, 387). Herein, we employed the CAS-MP2(8,7)/6-31G* as well as the CAS-MP2(10,8)/6-31G* computations to unravel the origin of (i) diastereoselectivities in dioxetane or hydroperoxide formation and (ii) regioselectivity leading to a [2 + 2] cycloadduct or an ene product when (1)O(2) reacts with an oxazolidinone tethered 2-phenyl-1-propenyl system. The computed Gibbs free energy profiles for E- and Z-isomers when (1)O(2) approaches through the hindered and nonhindered diastereotopic faces (by virtue of chiral oxazolidinone) of the enecarbamates exhibit distinct differences. In the case of E-isomer, the relative energies of the transition structures responsible for hydroperoxide (ene product) are lower than that for dioxetane formation. On the other hand, the ene pathway is predicted to involve higher barriers as compared to the corresponding dioxetane pathway for Z-isomer. The energy difference between the rate-determining diastereomeric transition structures involved in the most favored ene reaction for E-enecarbamate suggests high diastereoselectivity. In contrast, the corresponding energy difference for Z-enecarbamate in the ene pathway is found to be diminishingly close, implying low diastereoselectivity. However, the dioxetane formation from Z-enecarbamate is predicted to exhibit high diastereoselectivity. The application of activation strain model as well as the differences in stereoelectronic effects in the stereocontrolling transition structures is found to be effective toward rationalizing the origin of selectivities reported herein. These predictions are found to be in excellent agreement with the experimental observations.
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Affiliation(s)
- Ramanan Rajeev
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
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15
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Cheong PHY, Legault CY, Um JM, Çelebi-Ölçüm N, Houk KN. Quantum mechanical investigations of organocatalysis: mechanisms, reactivities, and selectivities. Chem Rev 2011; 111:5042-137. [PMID: 21707120 PMCID: PMC3154597 DOI: 10.1021/cr100212h] [Citation(s) in RCA: 429] [Impact Index Per Article: 33.0] [Reference Citation Analysis] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Paul Ha-Yeon Cheong
- Oregon State University, Department of Chemistry, 153 Gilbert Hall, Corvallis, OR 97331-4003 USA
| | - Claude Y. Legault
- University of Sherbrooke, Department of Chemistry, 2500 boul. de l’Université, local D1-3029, Sherbrooke (Québec) J1K 2R1 CANADA
| | - Joann M. Um
- University of California Los Angeles, Department of Chemistry and Biochemistry, 607 Charles E. Young Drive East, Los Angeles, CA 90095-1569 USA
| | - Nihan Çelebi-Ölçüm
- University of California Los Angeles, Department of Chemistry and Biochemistry, 607 Charles E. Young Drive East, Los Angeles, CA 90095-1569 USA
| | - K. N. Houk
- University of California Los Angeles, Department of Chemistry and Biochemistry, 607 Charles E. Young Drive East, Los Angeles, CA 90095-1569 USA
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16
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Jaccob M, Venuvanalingam P. Computational Insights into the Roles of Steric and Electrostatic Interactions in Arsenic Ylide Mediated Aziridination Reactions. European J Org Chem 2011. [DOI: 10.1002/ejoc.201100162] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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17
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Appel R, Mayr H. Quantification of the Electrophilic Reactivities of Aldehydes, Imines, and Enones. J Am Chem Soc 2011; 133:8240-51. [DOI: 10.1021/ja200820m] [Citation(s) in RCA: 93] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Roland Appel
- Department Chemie, Ludwig-Maximilians-Universität München, Butenandtstrasse 5-13, 81377 München, Germany
| | - Herbert Mayr
- Department Chemie, Ludwig-Maximilians-Universität München, Butenandtstrasse 5-13, 81377 München, Germany
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18
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Janardanan D, Sunoj RB. Chemo-, regio-, and diastereoselectivity preferences in the reaction of a sulfur ylide with a dienal and an enone. Org Biomol Chem 2011; 9:1642-52. [PMID: 21253652 DOI: 10.1039/c0ob00675k] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Mechanistic insights into an interesting class of reaction between sulfur ylides with (i) a dienal, and (ii) an enone, obtained by using density functional theory, is reported. The kinetic and thermodynamic factors responsible for chemo-, regio-, and diastereoselectivities are established by identifying all key transition states and intermediates along the reaction pathway for 1,2-, 1,4-, and 1,6- modes of attack of dimethylsulfonium benzylide to 5-phenylpenta-2,4-dienal. The reaction profiles for 1,2- and 1,4- modes of addition are also evaluated for the reaction between dimethylsulfonium benzylide and pent-3-en-2-one. Our results show that the final outcome of the reaction with both these substrates would be decided by the interplay between kinetic and thermodynamic factors. It is found that the addition of a semi-stabilized ylide to conjugated carbonyl compounds prefers to proceed through a 1,4- (conjugate) pathway under thermodynamic conditions, which is in accordance with the available experimental reports. However, the formation of epoxides via a 1,2- (direct) addition pathway is computed to be equally competitive, which could be the favored pathway under kinetic conditions. Even though the lower barrier for the initial addition step is kinetically advantageous for the direct (or 1,2-) addition pathway, the higher energy of the betaine intermediates--as well as the reversibility of the accompanying elementary step--may disfavor product formation in this route. Thus, high diastereoselectivity in favor of 2,3-trans cyclopropanecarbaldehyde is predicted in the case of the dienal, using the most favored conjugate addition (1,4-addition) pathway. Along similar lines, ylide addition to the enone is identified to exhibit a preference toward conjugate addition over direct (1,2-) addition. The importance of transition state analysis in delineating the controlling factors towards product distribution and diastereoselectivity is established.
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Affiliation(s)
- Deepa Janardanan
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai, 400076, India
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19
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Rajeev R, Sunoj RB. Mechanism and electronic effects in nitrogen ylide-promoted asymmetric aziridination reaction. Org Biomol Chem 2011; 9:2123-32. [DOI: 10.1039/c0ob00955e] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
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20
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Appel R, Hartmann N, Mayr H. Scope and Limitations of Cyclopropanations with Sulfur Ylides. J Am Chem Soc 2010; 132:17894-900. [DOI: 10.1021/ja1084749] [Citation(s) in RCA: 70] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Roland Appel
- Department Chemie, Ludwig-Maximilians-Universität München, Butenandtstrasse 5-13, 81377 München, Germany
| | - Nicolai Hartmann
- Department Chemie, Ludwig-Maximilians-Universität München, Butenandtstrasse 5-13, 81377 München, Germany
| | - Herbert Mayr
- Department Chemie, Ludwig-Maximilians-Universität München, Butenandtstrasse 5-13, 81377 München, Germany
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21
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Sabounchei SJ, Samiee S, Nematollahi D, Naghipour A, Morales-Morales D. Synthesis, characterization and structural studies of new palladium(II) complexes including non-symmetric phosphorus ylides. Inorganica Chim Acta 2010. [DOI: 10.1016/j.ica.2010.07.072] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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22
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Dokli I, Matanović I, Hameršak Z. Sulfur Ylide Promoted Synthesis of N-Protected Aziridines: A Combined Experimental and Computational Approach. Chemistry 2010; 16:11744-52. [DOI: 10.1002/chem.201001436] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2010] [Indexed: 11/10/2022]
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23
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Shinisha CB, Sunoj RB. Transition State Models for Probing Stereoinduction in Evans Chiral Auxiliary-Based Asymmetric Aldol Reactions. J Am Chem Soc 2010; 132:12319-30. [PMID: 20707387 DOI: 10.1021/ja101913k] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- C. B. Shinisha
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
| | - Raghavan B. Sunoj
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
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24
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Arroyo Y, Meana Á, Rodríguez JF, Sanz-Tejedor MA, Alonso I, García Ruano JL. Stereoselective Control of Planar α-Dimethylsulfonium Benzyl Carbanions. Synthesis of Optically Pure trans-Aziridines. J Org Chem 2009; 74:4217-24. [DOI: 10.1021/jo900381b] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Yolanda Arroyo
- Departamento de Química Orgánica (ETSII), Universidad de Valladolid, Po del Cauce s/n, 47011 Valladolid, Spain, and Departamento de Química Orgánica (C-I), Universidad Autónoma de Madrid, Cantoblanco, 28049 Madrid, Spain
| | - Ángela Meana
- Departamento de Química Orgánica (ETSII), Universidad de Valladolid, Po del Cauce s/n, 47011 Valladolid, Spain, and Departamento de Química Orgánica (C-I), Universidad Autónoma de Madrid, Cantoblanco, 28049 Madrid, Spain
| | - J. Félix Rodríguez
- Departamento de Química Orgánica (ETSII), Universidad de Valladolid, Po del Cauce s/n, 47011 Valladolid, Spain, and Departamento de Química Orgánica (C-I), Universidad Autónoma de Madrid, Cantoblanco, 28049 Madrid, Spain
| | - M. Ascensión Sanz-Tejedor
- Departamento de Química Orgánica (ETSII), Universidad de Valladolid, Po del Cauce s/n, 47011 Valladolid, Spain, and Departamento de Química Orgánica (C-I), Universidad Autónoma de Madrid, Cantoblanco, 28049 Madrid, Spain
| | - Inés Alonso
- Departamento de Química Orgánica (ETSII), Universidad de Valladolid, Po del Cauce s/n, 47011 Valladolid, Spain, and Departamento de Química Orgánica (C-I), Universidad Autónoma de Madrid, Cantoblanco, 28049 Madrid, Spain
| | - José L. García Ruano
- Departamento de Química Orgánica (ETSII), Universidad de Valladolid, Po del Cauce s/n, 47011 Valladolid, Spain, and Departamento de Química Orgánica (C-I), Universidad Autónoma de Madrid, Cantoblanco, 28049 Madrid, Spain
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25
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X-ray and spectroscopy studies of antisymbiotic effect O-coordination of the 4-methoxy benzoyl methylene triphenyl phosphorane ligand in palladium(II) complex. Inorganica Chim Acta 2009. [DOI: 10.1016/j.ica.2008.12.013] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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26
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Different bonding modes of sulfur bis-ylides in Pd complexes: Crystal structure of [Pd(μ-OAc){μ-[CH(SMe2)]2C(O)}(acac-O,O′)2]ClO4. J Mol Struct 2008. [DOI: 10.1016/j.molstruc.2008.03.033] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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27
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Janardanan D, Sunoj RB. Enantio- and diastereoselectivities in chiral sulfur ylide promoted asymmetric aziridination reactions. J Org Chem 2008; 73:8163-74. [PMID: 18842028 DOI: 10.1021/jo800652c] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Density functional theory investigation on the factors controlling enantio- and diastereoselection in asymmetric aziridination reaction by the addition of chiral bicyclic sulfur ylides to substituted aldimines is presented. High levels of enantioselection are predicted toward the formation of (2S,3S)-cis and (2R,3S)-trans aziridines by the addition of stabilized ylide (R = COMe) respectively to SO2Me and CO2Me protected aldimines. Similarly, high %ee is predicted for the formation of (2S,3R)-cis aziridines from semistabilized (R = Ph) ylide. Moderate to high levels of diastereoselectivity is noticed as well. The present study highlights that a correct prediction on extent of enantioselection requires the knowledge of the activation barriers for elementary steps beyond the initial addition step. In the case of stabilized ylides the ring-closure (or elimination of sulfur compound) is found to be crucial in controlling enantio- and diastereoselection. A cumulative effect of electronic as well as other weak interactions is identified as factors contributing to the relative energies of transition states leading to enantio- and diastereomeric products for the stabilized ylide addition to aldimines. On the contrary, steric control appears quite dominant with semistabilized ylide addition. With the smallest substituent on ylide (R = Me), high enantioselectivity is predicted for the formation of (2R,3R)-trans aziridines although the %de in this case is found to be very low.
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Affiliation(s)
- Deepa Janardanan
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
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28
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Shinisha CB, Sunoj RB. Unraveling high precision stereocontrol in a triple cascade organocatalytic reaction. Org Biomol Chem 2008; 6:3921-9. [DOI: 10.1039/b810901j] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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29
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Acosta-Silva C, Branchadell V. Comparison of density functionals for reactions of sulfur ylides with aldehydes and olefins. J Phys Chem A 2007; 111:12019-25. [PMID: 17975897 DOI: 10.1021/jp075708f] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The reactions of a model sulfur ylide with formaldehyde and 1,1-dicianoethylene, leading to the formation of an epoxyde and a cyclopropane, respectively, have been studied using different computational methods, and the results have been compared to those obtained with the CBS-QB3 method. The second step of these reactions presents transition states similar to that of an SN2 reaction. Depending on the degree of electron delocalization at the transition state, a different amount of exact exchange is necessary in the exchange functional to obtain accurate energy barriers. This amount is larger for the reaction of formaldehyde, in which the transition state is more delocalized, than for the reaction of 1,1-dicianoethylene. Similar results have been obtained for symmetric and non-symmetric SN2 reactions. The calculation of the reaction path has shown that the error relative to CBS-QB3 tends to increase when approaching the transition state. Among the different computational methods, PBE1PBE is the one to provide the most accurate energy barriers and reaction energies, whereas BB1K leads to the best results for the reaction path before the transition state.
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Affiliation(s)
- Carles Acosta-Silva
- Departament de Química, Universitat Autonoma de Barcelona, 08193, Bellaterra, Spain
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