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Artigos de revistas sobre o tema "Allyic substitution"

Autor: Grafiati

Publicado: 2 de novembro de 2024

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1

Hastings, Alan. "Substitution Rates Under Stabilizing Selection". Genetics 116, n.º 3 (1 de julho de 1987): 479–86. http://dx.doi.org/10.1093/genetics/116.3.479.

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ABSTRACT Allelic substitutions under stabilizing phenotypic selection on quantitative traits are studied in Monte Carlo simulations of 8 and 16 loci. The results are compared and contrasted to analytical models based on work of M. Kimura for two and "infinite" loci. Selection strengths of S = 4Nes approximately four (which correspond to reasonable strengths of selection for quantitative characters) can retard substitution rates tenfold relative to rates under neutrality. An important finding is a strong dependence of per locus substitution rates on the number of loci.

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2

Vilotijevic, Ivan, Markus Lange e You Zi. "Latent (Pro)Nucleophiles in Enantioselective Lewis Base Catalyzed Allylic Substitutions". Synlett 31, n.º 13 (4 de junho de 2020): 1237–43. http://dx.doi.org/10.1055/s-0040-1707130.

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The use of latent nucleophiles, which are molecules that are not nucleophilic but can be activated to act as a nucleophile at an opportune time during the reaction, expands the scope of Lewis base catalyzed reactions. Here, we provide an overview of the concept and show examples of applications to N- and C-centered nucleophiles in allylic substitutions. N- and C-silyl compounds are superior latent (pro)nucleophiles in Lewis base catalyzed reactions with allylic fluorides in which the formation of the strong Si–F bond serves as the driving force for the reactions. The latent (pro)nucleophiles ensure high regioselectivity in these reactions and enable enantioselective transformations of Morita–Baylis–Hillman adducts by the use of common chiral Lewis base catalysts.1 Introduction2 Substitution of MBH Carbonates3 The Concept of Latent (Pro)Nucleophiles4 Enantioselective Allylation of N-Heterocycles5 Enantioselective Phosphonyldifluoromethylation of Allylic Fluorides6 Conclusion

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3

Lopes Jesus, A. J., Cláudio M. Nunes, Gil A. Ferreira, Kiarash Keyvan e R. Fausto. "Photochemical Generation and Characterization of C-Aminophenyl-Nitrilimines: Insights on Their Bond-Shift Isomers by Matrix-Isolation IR Spectroscopy and Density Functional Theory Calculations". Molecules 29, n.º 15 (25 de julho de 2024): 3497. http://dx.doi.org/10.3390/molecules29153497.

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The intriguing ability of C-phenyl-nitrilimine to co-exist as allenic and propargylic bond-shift isomers motivated us to investigate how substituents in the phenyl ring influence this behavior. Building on our previous work on the meta- and para-OH substitution, here we extended this investigation to explore the effect of the NH2 substitution. For this purpose, C-(4-aminophenyl)- and C-(3-aminophenyl)-nitrilimines were photogenerated in an argon matrix at 15 K by narrowband UV-light irradiation (λ = 230 nm) of 5-(4-aminophenyl)- and 5-(3-aminophenyl)-tetrazole, respectively. The produced nitrilimines were further photoisomerized to carbodiimides via 1H-diazirines by irradiations at longer wavelengths (λ = 380 or 330 nm). Combining IR spectroscopic measurements and DFT calculations, it was found that the para-NH2-substituted nitrilimine exists as a single isomeric structure with a predominant allenic character. In contrast, the meta-NH2-substituted nitrilimine co-exists as two bond-shift isomers characterized by propargylic and allenic structures. To gain further understanding of the effects of phenyl substitution on the bond-shift isomerism of the nitrilimine fragment, we compared geometric and charge distribution data derived from theoretical calculations performed for C-phenyl-nitrilimine with those performed for the derivatives resulting from NH2 (electron-donating group) and NO2 (electron-withdrawing group) phenyl substitutions.

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4

Bergbreiter, David E., Andrew Kippenberger e Zhenqi Zhong. "Catalysis with palladium colloids supported in poly(acrylic acid)-grafted polyethylene and polystyrene". Canadian Journal of Chemistry 84, n.º 10 (1 de outubro de 2006): 1343–50. http://dx.doi.org/10.1139/v06-076.

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Grafts of poly(acrylic acid) on polyethylene powder (PE-g-PAA) or polystyrene (PS-g-PAA) can be used to support Pd(0) crystallites that function like a homogeneous Pd(0) catalyst in some reactions. These Pd–PE-g-PAA catalysts were active in allylic substitution reactions in the presence of added phosphine ligand. A catalyst analogous to the Pd–PE-g-PAA powder catalyst on polystyrene (Pd–PS-g-PAA) was similarly active for allylic substitution and could also be used in Heck reactions at 80–100 °C in N,N-dimethylacetamide (DMA). Analysis of the product solutions for Pd leachate and a correlation of the Pd leaching with product formation in the allylic substitution chemistry for both types of catalysts suggests that the active catalysts in these reactions are leached from the support. In the case of the allylic substitution reaction, external triphenylphosphine and substrate together are required for the chemistry and Pd leaching.Key words: catalysis, palladium, allylic substitution, grafted polystyrene, supported catalysts.

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5

Kang, Suk-Ku, Dae-Yeun Kim, Ryung-Kee Hong e Pil-Su Ho. "Ruthenium-Catalyzed Allylic Substitution of Allylic Cyclic Carbonates". Synthetic Communications 26, n.º 17 (setembro de 1996): 3225–35. http://dx.doi.org/10.1080/00397919608004631.

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6

Shekhar, Shashank, Brian Trantow, Andreas Leitner e John F. Hartwig. "Sequential Catalytic Isomerization and Allylic Substitution. Conversion of Racemic Branched Allylic Carbonates to Enantioenriched Allylic Substitution Products". Journal of the American Chemical Society 128, n.º 36 (setembro de 2006): 11770–71. http://dx.doi.org/10.1021/ja0644273.

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7

Boussonnière, Anne, Anne-Sophie Castanet e Hélène Guyon. "Transition-Metal-Free Enantioselective Reactions of Organomagnesium Reagents Mediated by Chiral Ligands". Synthesis 50, n.º 18 (20 de junho de 2018): 3589–602. http://dx.doi.org/10.1055/s-0037-1610135.

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Organomagnesium reagents are among the most important reagents in organic chemistry because of their great utility in forming carbon–carbon bonds. Although most enantioselective reactions using these organometallics involve transmetalation, the past decade has witnessed impressive advances in direct chiral-ligand-mediated reactions of organomagnesiums. This short review presents an overview of these achievements in enantioselective nucleophilic additions and substitutions.1 Introduction2 Enantioselective Nucleophilic Additions2.1 Addition to C=O Bonds2.2 Addition to C=N Bonds2.3 Addition to C=C Bonds3 Enantioselective Substitution Reactions3.1 Sulfoxide–Magnesium Exchange3.2 Desymmetrization via Anhydride Opening3.3 Asymmetric Allylic Alkylation (AAA)4 Conclusion

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8

Thoke, Mahesh Bhagwan, e Qiang Kang. "Rhodium-Catalyzed Allylation Reactions". Synthesis 51, n.º 13 (30 de abril de 2019): 2585–631. http://dx.doi.org/10.1055/s-0037-1611784.

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Rhodium-catalyzed allylation reactions are well known for their unique selectivity and reactivity due to the high memory effect of Rh as compared to other metals. These reactions involve the substitution of allylic rhodium intermediates with a diverse range of different nucleophiles, leading to C–C and C–heteroatom bond formation. Modern organic chemists are, however, interested in atom-economical protocols under greener pathways and following recent increased understanding of mechanistic aspects of Rh-catalyzed allylation via the hydrofunctionalization of allenes or alkynes, great strides have made in the design and development of new atom-economical protocols. In this article, we review this field from its beginning to current state.1 Introduction2 Rhodium-Catalyzed Allylic Substitution3 Rhodium-Catalyzed Allylation with Allenes4 Rhodium-Catalyzed Allylation with Alkynes5 Rhodium-Catalyzed Allylation with Dienes6 Rhodium-Catalyzed Allylation by ARO of Oxabicyclic Alkenes7 Rhodium-Catalyzed Enantioselective Allylation in Natural Product and Drug Synthesis8 Conclusion

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9

Takeuchi, Ryo. "Iridium-Catalyzed Enantioselective Allylic Substitution". Journal of Synthetic Organic Chemistry, Japan 74, n.º 9 (2016): 885–902. http://dx.doi.org/10.5059/yukigoseikyokaishi.74.885.

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10

Alexakis, A., e C. Falciola. "Copper-Catalyzed Asymmetric Allylic Substitution". Synfacts 2007, n.º 7 (julho de 2007): 0714. http://dx.doi.org/10.1055/s-2007-968661.

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11

You, S. L., Q. L. Xu, W. B. Liu e L. X. Dai. "Iridium-Catalyzed Asymmetric Allylic Substitution". Synfacts 2010, n.º 10 (22 de setembro de 2010): 1161. http://dx.doi.org/10.1055/s-0030-1258691.

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12

Carreira, E., e M. Roggen. "Stereospecific Substitution of Allylic Alcohols". Synfacts 2010, n.º 11 (21 de outubro de 2010): 1259. http://dx.doi.org/10.1055/s-0030-1258797.

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13

Malkov, Andrei V., Ian Baxendale, Darren J. Mansfield e Pavel Kočovsky. "Molybdenum(II)-catalyzed allylic substitution". Tetrahedron Letters 38, n.º 27 (julho de 1997): 4895–98. http://dx.doi.org/10.1016/s0040-4039(97)01052-6.

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14

Pfaltz, Andreas, e Mark Lautens. "ChemInform Abstract: Allylic Substitution Reactions". ChemInform 31, n.º 18 (8 de junho de 2010): no. http://dx.doi.org/10.1002/chin.200018236.

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15

Crawley, M. L. "ChemInform Abstract: Allylic Substitution Reactions". ChemInform 42, n.º 42 (27 de setembro de 2011): no. http://dx.doi.org/10.1002/chin.201142253.

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16

Kojima, Masahiro, Shigeki Matsunaga, Tomoyuki Sekino, Shunta Sato, Kazuki Kuwabara, Koji Takizawa e Tatsuhiko Yoshino. "Allyl 4-Chlorophenyl Sulfone as a Versatile 1,1-Synthon for Sequential α-Alkylation/Cobalt-Catalyzed Allylic Substitution". Synthesis 52, n.º 13 (27 de abril de 2020): 1934–46. http://dx.doi.org/10.1055/s-0040-1707524.

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Despite their unique potential as rare 1,1-dipole synthons, allyl sulfones are rarely used in target-oriented syntheses, likely due to the lack of a general catalytic method for their branch-selective allylic substitution. Herein, we identified allyl 4-chlorophenyl sulfone as a versatile linchpin for both base-mediated α-derivatization and subsequent cobalt-catalyzed allylic substitution. The sequential transformations allow for highly regioselective access to branched allylic substitution products with a variety of aliphatic side chains. The photoredox-enabled cobalt catalysis is indispensable for achieving high yields and regioselectivity for the desulfonylative substitution in contrast to traditional metal-catalyzed protocols, which lead to inferior outcomes in the corresponding transformations.

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17

Han, Jun-Fa, Peng Guo, Xiang-Gui Zhang, Jia-Bin Liao e Ke-Yin Ye. "Recent advances in cobalt-catalyzed allylic functionalization". Organic & Biomolecular Chemistry 18, n.º 39 (2020): 7740–50. http://dx.doi.org/10.1039/d0ob01581d.

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18

Butt, Nicholas A., e Wanbin Zhang. "Transition metal-catalyzed allylic substitution reactions with unactivated allylic substrates". Chemical Society Reviews 44, n.º 22 (2015): 7929–67. http://dx.doi.org/10.1039/c5cs00144g.

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19

Bruneau, Christian, Jean-Luc Renaud e Bernard Demerseman. "Ruthenium catalysts for selective nucleophilic allylic substitution". Pure and Applied Chemistry 80, n.º 5 (1 de janeiro de 2008): 861–71. http://dx.doi.org/10.1351/pac200880050861.

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Recent developments in the chemistry of η3-allylruthenium(IV) complexes are due to their straightforward synthesis resulting from oxidative addition of allylic substrates to a ruthenium(II) center. Subsequent reaction with a nucleophile is the basis of their involvement in the catalytic allylic substitution reaction. We focus here on ruthenium-catalyzed substitution of allylic substrates by C-, N-, and O-nucleophiles and show that selected ligands make regio- and enantioselective reactions possible.

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20

Bourgeois, Marie-Josèphe, Marianne Vialemaringe, Monique Campagnole e Evelyne Montaudon. "Réaction compétitive de la substitution homolytique intramoléculaire : décomposition de peroxydes allyliques dans le thioglycolate de méthyle". Canadian Journal of Chemistry 79, n.º 3 (1 de março de 2001): 257–62. http://dx.doi.org/10.1139/v01-024.

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The decomposition of allylic peroxides in methyl thioglycolate always leads to both epoxide and adduct peroxide. According to the nature of the allylic chain, either epoxide or peroxide is the predominant product, if not the only one. It is the first example where the hydrogen transfer is as fast as the intramolecular homolytic substitution. The influence of different factors upon the competition is studied.Key words: allylic peroxides, epoxides, intramolecular homolytic substitution, transfer.

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21

Busfield, WK, DI Grice, ID Jenkins e SH Thang. "Reaction of t-Butoxy Radicals With Cyclic Alkenes Studied by the Nitroxide Radical-Trapping Technique". Australian Journal of Chemistry 44, n.º 10 (1991): 1407. http://dx.doi.org/10.1071/ch9911407.

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The pattern of reactions occurring between t- butoxy radicals and a number of cyclic alkenes has been investigated by the nitroxide radical-trapping technique. The major reaction pathway is allylic abstraction unless this position is at a bridgehead as in norbornene where the major pathway is radical addition. The technique is sufficiently sensitive to identify minor reaction pathways of non-allylic substitution and radical addition when in the presence of extensive allylic substitution. Some stereoselective effects are also detected.

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22

Kawatsura, Motoi, Maki Minakawa e Toshiyuki Itoh. "Ruthenium-Catalyzed Stereoselective Allylic Substitutions". Journal of Synthetic Organic Chemistry, Japan 74, n.º 1 (2016): 45–55. http://dx.doi.org/10.5059/yukigoseikyokaishi.74.45.

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23

Reiser, Oliver. "Palladium-Catalyzed, Enantioselective Allylic Substitutions". Angewandte Chemie International Edition in English 32, n.º 4 (abril de 1993): 547–49. http://dx.doi.org/10.1002/anie.199305471.

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24

Zemtsov, Artem A., Vitalij V. Levin e Alexander D. Dilman. "Allylic substitution reactions with fluorinated nucleophiles". Coordination Chemistry Reviews 459 (maio de 2022): 214455. http://dx.doi.org/10.1016/j.ccr.2022.214455.

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25

Alexakis, Alexandre, Christophe Malan, Louise Lea, Karine Tissot-Croset, Damien Polet e Caroline Falciola. "The Copper-Catalyzed Asymmetric Allylic Substitution". CHIMIA International Journal for Chemistry 60, n.º 3 (28 de março de 2006): 124–30. http://dx.doi.org/10.2533/000942906777674994.

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26

Pàmies, O., M. Diéguez, E. Raluy e C. Claver. "Phosphoramidite-Phosphite Ligands for Allylic Substitution". Synfacts 2007, n.º 4 (abril de 2007): 0395. http://dx.doi.org/10.1055/s-2007-968365.

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27

Cheng, Qiang, Hang-Fei Tu, Chao Zheng, Jian-Ping Qu, Günter Helmchen e Shu-Li You. "Iridium-Catalyzed Asymmetric Allylic Substitution Reactions". Chemical Reviews 119, n.º 3 (24 de dezembro de 2018): 1855–969. http://dx.doi.org/10.1021/acs.chemrev.8b00506.

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28

Malkov, Andrei V., Paul Spoor, Victoria Vinader e Pavel Kočovský. "Asymmetric molybdenum(0)-catalyzed allylic substitution". Tetrahedron Letters 42, n.º 3 (janeiro de 2001): 509–12. http://dx.doi.org/10.1016/s0040-4039(00)02007-4.

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29

Hyodo, Tomonori, Yuji Katayama e Yuichi Kobayashi. "Allylic substitution on the pyran ring". Tetrahedron Letters 50, n.º 26 (julho de 2009): 3547–49. http://dx.doi.org/10.1016/j.tetlet.2009.03.018.

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30

Frost, Christopher G., Joshua Howarth e J. M. J. Williams. "Selectivity in palladium catalysed allylic substitution". Tetrahedron: Asymmetry 3, n.º 9 (setembro de 1992): 1089–122. http://dx.doi.org/10.1016/s0957-4166(00)82091-1.

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31

Benedetto, Elena, Massaba Keita, Matthew Tredwell, Charlotte Hollingworth, John M. Brown e Véronique Gouverneur. "Platinum-Catalyzed Substitution of Allylic Fluorides". Organometallics 31, n.º 4 (20 de janeiro de 2012): 1408–16. http://dx.doi.org/10.1021/om201029m.

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32

Hartwig, John F., e Mark J. Pouy. "ChemInform Abstract: Iridium-Catalyzed Allylic Substitution". ChemInform 42, n.º 52 (1 de dezembro de 2011): no. http://dx.doi.org/10.1002/chin.201152252.

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33

Hazari, Amaruka, Véronique Gouverneur e John M Brown. "Palladium-Catalyzed Substitution of Allylic Fluorides". Angewandte Chemie International Edition 48, n.º 7 (13 de janeiro de 2009): 1296–99. http://dx.doi.org/10.1002/anie.200804310.

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34

Hazari, Amaruka, Véronique Gouverneur e John M Brown. "Palladium-Catalyzed Substitution of Allylic Fluorides". Angewandte Chemie 121, n.º 7 (13 de janeiro de 2009): 1322–25. http://dx.doi.org/10.1002/ange.200804310.

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35

Starý, Ivo, Irena G. Stará e Pavel Kocˇovský. "Palladium(O)-catalyzed allylic substitution with allylic alkoxides as substrates". Tetrahedron 50, n.º 2 (janeiro de 1994): 529–37. http://dx.doi.org/10.1016/s0040-4020(01)80774-2.

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36

KANG, S. K., D. Y. KIM, R. K. HONG e P. S. HO. "ChemInform Abstract: Ruthenium-Catalyzed Allylic Substitution of Allylic Cyclic Carbonates." ChemInform 27, n.º 48 (4 de agosto de 2010): no. http://dx.doi.org/10.1002/chin.199648088.

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37

Purdue, P. E., Y. Takada e C. J. Danpure. "Identification of mutations associated with peroxisome-to-mitochondrion mistargeting of alanine/glyoxylate aminotransferase in primary hyperoxaluria type 1." Journal of Cell Biology 111, n.º 6 (1 de dezembro de 1990): 2341–51. http://dx.doi.org/10.1083/jcb.111.6.2341.

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We have previously shown that in some patients with primary hyperoxaluria type 1 (PH1), disease is associated with mistargeting of the normally peroxisomal enzyme alanine/glyoxylate aminotransferase (AGT) to mitochondria (Danpure, C.J., P.J. Cooper, P.J. Wise, and P.R. Jennings. J. Cell Biol. 108:1345-1352). We have synthesized, amplified, cloned, and sequenced AGT cDNA from a PH1 patient with mitochondrial AGT (mAGT). This identified three point mutations that cause amino acid substitutions in the predicted AGT protein sequence. Using PCR and allele-specific oligonucleotide hybridization, a range of PH1 patients and controls were screened for these mutations. This revealed that all eight PH1 patients with mAGT carried at least one allele with the same three mutations. Two were homozygous for this allele and six were heterozygous. In at least three of the heterozygotes, it appeared that only the mutant allele was expressed. All three mutations were absent from PH1 patients lacking mAGT. One mutation encoding a Gly----Arg substitution at residue 170 was not found in any of the control individuals. However, the other two mutations, encoding Pro----Leu and Ile----Met substitutions at residues 11 and 340, respectively, cosegregated in the normal population at an allelic frequency of 5-10%. In an individual homozygous for this allele (substitutions at residues 11 and 340) only a small proportion of AGT appeared to be rerouted to mitochondria. It is suggested that the substitution at residue 11 generates an amphiphilic alpha-helix with characteristics similar to recognized mitochondrial targeting sequences, the full functional expression of which is dependent upon coexpression of the substitution at residue 170, which may induce defective peroxisomal import.

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38

Kim, Byeong-Seon, Mahmud M. Hussain, Per-Ola Norrby e Patrick J. Walsh. "Breaking conjugation: unusual regioselectivity with 2-substituted allylic substrates in the Tsuji–Trost reaction". Chem. Sci. 5, n.º 3 (2014): 1241–50. http://dx.doi.org/10.1039/c3sc53035c.

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Zhu, Xu, e Shunsuke Chiba. "TEMPO-mediated allylic C–H amination with hydrazones". Org. Biomol. Chem. 12, n.º 26 (2014): 4567–70. http://dx.doi.org/10.1039/c4ob00839a.

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TEMPO-mediated reactions of alkenyl hydrazones afforded azaheterocycles via sp³ C–H allylic amination. The transformation is featured by a sequence of remote allylic H-radical shift and allylic homolytic substitution with hydrazone radicals.

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40

Xu, Ruigang, Kai Li, Jiaqi Wang, Jiamin Lu, Lina Pan, Xiaofei Zeng e Guofu Zhong. "Direct enantioselective allylic substitution of 4-hydroxycoumarin derivatives with branched allylic alcohols via iridium catalysis". Chemical Communications 56, n.º 60 (2020): 8404–7. http://dx.doi.org/10.1039/d0cc02832k.

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An iridium catalysed direct asymmetric allylic substitution reaction of 4-hydroxycoumarin derivatives with allylic alcohols with remarkably high yields and excellent enantioselectivities was realized.

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41

Kobayashi, Yuichi, e Takuri Ozaki. "Concise Synthesis of (–)-Axenol by Using Stereocontrolled Allylic Substitution". Synlett 26, n.º 08 (5 de março de 2015): 1085–88. http://dx.doi.org/10.1055/s-0034-1380273.

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Synthesis of (–)-axenol was achieved stereoselectively through allylic substitution to form the quaternary carbon followed by ring-closing metathesis. The key allylic picolinate was synthesized from natural menthol.

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42

Xue, Weichao, e Martin Oestreich. "Silicon Grignard Reagents as Nucleophiles in Transition-Metal-Catalyzed Allylic Substitution". Synthesis 51, n.º 01 (22 de outubro de 2018): 233–39. http://dx.doi.org/10.1055/s-0037-1610309.

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A broad range of transition-metal catalysts is shown to promote allylic substitution reactions of allylic electrophiles with silicon Grignard reagents. The procedure was further elaborated for CuI as catalyst. The regioselectively is independent of the leaving group for primary allylic precursors, favoring α over γ. The stereochemical course of this allylic transposition was probed with a cyclic system, and anti-diastereoselectivity was obtained.

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43

Liang, Xiao, Kun Wei e Yu-Rong Yang. "Iridium-catalyzed enantioselective allylation of silyl enol ethers derived from ketones and α,β-unsaturated ketones". Chemical Communications 51, n.º 98 (2015): 17471–74. http://dx.doi.org/10.1039/c5cc07221b.

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44

Sundararaju, Basker, Mathieu Achard e Christian Bruneau. "Transition metal catalyzed nucleophilic allylic substitution: activation of allylic alcohols via π-allylic species". Chemical Society Reviews 41, n.º 12 (2012): 4467. http://dx.doi.org/10.1039/c2cs35024f.

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45

Deng, Yingying, Wen Yang, Xin Yang e Dingqiao Yang. "Progress in Iridium-Catalyzed Asymmetric Allylic Substitution Reactions with Allylic Esters". Chinese Journal of Organic Chemistry 37, n.º 12 (2017): 3039. http://dx.doi.org/10.6023/cjoc201704034.

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46

Ma, Xiantao, Jing Yu, Zilong Wang, Yun Zhang e Qiuju Zhou. "Efficient Activation of Allylic Alcohols in Pd-Catalyzed Allylic Substitution Reactions". Chinese Journal of Organic Chemistry 40, n.º 9 (2020): 2669. http://dx.doi.org/10.6023/cjoc202005013.

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