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Träfflista för sökning "WFRF:(Szabó Kálmán J) "

Sökning: WFRF:(Szabó Kálmán J)

  • Resultat 1-10 av 147
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1.
  • Kanai, M, et al. (författare)
  • 2023
  • swepub:Mat__t
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  • Aydin, Juhanes, et al. (författare)
  • Synthesis and catalytic application of chiral 1,1'-Bi-2-naphthol- and biphenanthrol-based pincer complexes: selective allylation of sulfonimines with allyl stannane and allyl trifluoroborate.
  • 2007
  • Ingår i: Journal of Organic Chemistry. - : American Chemical Society (ACS). - 0022-3263 .- 1520-6904. ; 72:13, s. 4689-4697
  • Tidskriftsartikel (refereegranskat)abstract
    • New easily accessible 1,1'-bi-2-naphthol- (BINOL-) and biphenanthrol-based chiral pincer complex catalysts were prepared for selective (up to 85% enantiomeric excess) allylation of sulfonimines. The chiral pincer complexes were prepared by a flexible modular approach allowing an efficient tuning of the selectivity of the catalysts. By employment of the different enantiomeric forms of the catalysts, both enantiomers of the homoallylic amines could be selectively obtained. Both allyl stannanes and allyl trifluoroborates can be employed as allyl sources in the reactions. The biphenanthrol-based complexes gave higher selectivity than the substituted BINOL-based analogues, probably because of the well-shaped chiral pocket generated by employment of the biphenanthrol complexes. The enantioselective allylation of sulfonimines presented in this study has important implications for the mechanism given for the pincer complex-catalyzed allylation reactions, confirming that this process takes place without involvement of palladium(0) species.
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  • Bermejo Gómez, Antonio, et al. (författare)
  • Efficient DBU accelerated synthesis of F-18-labelled trifluoroacetamides
  • 2016
  • Ingår i: Chemical Communications. - : Royal Society of Chemistry (RSC). - 1359-7345 .- 1364-548X. ; 52:97, s. 13963-13966
  • Tidskriftsartikel (refereegranskat)abstract
    • Nucleophilic F-18-fluorination of bromodifluoromethyl derivatives was performed using [F-18] Bu4NF in the presence of DBU(1,8-diazabicyclo[5.4.0]undec-7-ene). This novel procedure provided a diverse set of [F-18] trifluoroacetamides in good to excellent radiochemical conversions. A mechanism where DBU acts as organomediator in this transformation is proposed.
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  • Bermejo Gómez, Antonio, et al. (författare)
  • Synthesis of trifluoromethyl moieties by late-stage copper (I) mediated nucleophilic fluorination
  • 2017
  • Ingår i: Journal of fluorine chemistry. - : Elsevier BV. - 0022-1139 .- 1873-3328. ; 194, s. 51-57
  • Tidskriftsartikel (refereegranskat)abstract
    • The nucleophilic fluorination of bromodifluoromethyl derivatives mediated by the complex (PPh3)(3)CuF is described. Under the reaction conditions, different trifluoroacetates, trifluorolcetones, trifluoroarenes and trifluoroacetamides were obtained in good yields.
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  • Jonker, Sybrand J. T., et al. (författare)
  • Catalytic asymmetric propargyl- and allylboration of hydrazonoesters : a metal-free approach to sterically encumbered chiral alpha-amino acid derivatives
  • 2018
  • Ingår i: Chemical Communications. - : Royal Society of Chemistry (RSC). - 1359-7345 .- 1364-548X. ; 54:91, s. 12852-12855
  • Tidskriftsartikel (refereegranskat)abstract
    • A new asymmetric catalytic propargyl- and allylboration of hydrazonoesters is reported. The reactions utilize allenyl- and allylboronic acids in the presence of the inexpensive parent BINOL catalyst. The reactions can be performed under mild conditions (0 degrees C) without any metal catalyst or other additives affording sterically encumbered chiral -amino acids. This is the first metal-free method for the asymmetric propargyl- and allylboration of hydrazonoesters.
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  • Resultat 1-10 av 147
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