Dendrimers based on cyclophosphazene units and containing chiral ferrocenyl ligands for asymmetric catalysis†

(Note: The full text of this document is currently only available in the PDF Version )

Raoul Schneider, Christoph Köllner, Immo Weber and Antonio Togni


Abstract

A simple and efficient synthesis and characterization of a series of first generation dendrimers based on cyclophosphazene cores and containing up to 16 peripheral chiral ferrocenyl ligands is described.


References

  1. For reviews, see, e.g.: (a) G. R. Newkome, E. He and C. H. Moorefield, Chem. Rev., 1999, 99, 1689 CrossRef CAS; (b) J.-P. Majoral and A.-M. Caminade, Chem. Rev., 1999, 99, 845 CrossRef CAS; (c) A. W. Bosman, H. M. Janssen and E. W. Meijer, Chem. Rev., 1999, 99, 1665 CrossRef CAS; (d) A. Archut and F. Vögtle, Chem. Soc. Rev., 1998, 27, 233 RSC; (e) M. Fischer and F. Vögtle, Angew. Chem., Int. Ed., 1999, 38, 885 CAS; (f) M. A. Hearshaw and J. R. Moss, Chem. Commun., 1999, 1 RSCFor the synthesis of dendrimers incorporating phosphorus, see: (g) C. Galliot, D. Prévoté, A.-M. Caminade and J.-P. Majoral, J. Am. Chem. Soc., 1995, 117, 5470 CrossRef CAS; (h) M. Slany, M. Bardají, M.-J. Casanove, A.-M. Caminade, J.-P. Majoral and B. Chaudret, J. Am. Chem. Soc., 1995, 117, 9764 CrossRef CAS.
  2. P. B. Rheiner, H. Sellner and D. Seebach, Helv. Chim. Acta, 1997, 80, 2027 CrossRef CAS; C. Bolm, N. Derrien and A. Seger, Synlett, 1996, 387 CrossRef CAS; H. Brunner, J. Organomet. Chem., 1995, 500, 39 CrossRef CAS; M. T. Reetz, G. Lohmer and R. Schwickardi, Angew. Chem., Int. Ed. Engl., 1997, 36, 1526 CrossRef CAS; G. E. Oosterom, R. J. van Haaren, J. N. H. Reek, P. C. J. Kamer and P. W. N. M. van Leeuwen, Chem. Commun., 1999, 1119 RSC; H. P. Dijkstra, P. Steenwinkel, D. M. Grove, M. Lutz, A. L. Spek and G. van Koten, Angew. Chem., Int. Ed., 1999, 38, 2186 CrossRef; J. W. J. Knapen, A. W. van der Made, J. C. de Wilde, P. W. N. M. van Leeuwen, P. Wijkens, D. M. Grove and G. van Koten, Nature, 1994, 372, 659 CrossRef CAS.
  3. U. Kragl and C. Dreisbach, Angew. Chem., Int. Ed. Engl., 1996, 35, 642 CrossRef CAS; D. de Groot, E. B. Eggeling, J. C. de Wilde, H. Kooijmann, R. J. van Haaren, A. W. van der Made, A. L. Spek, D. Vogt, J. N. H. Reek, P. C. J. Kamer and P. W. N. M. van Leeuwen, Chem. Commun., 1999, 1623 RSC; N. J. Hovestad, E. B. Eggeling, H. J. Heidbüchel, J. T. B. H. Jastrzebski, U. Kragl, W. Keim, D. Vogt and G. van Koten, Angew. Chem., Int. Ed., 1999, 38, 1655 CrossRef CAS.
  4. See, e.g.A. Togni, in Metallocenes. Synthesis, Reactivity, Applications, ed. A. Togni and R. L. Halterman, Wiley-VCH, Weinheim, 1998, vol. 2, pp. 685–721 and references cited therein Search PubMed.
  5. C. Köllner, B. Pugin and A. Togni, J. Am. Chem. Soc., 1998, 120, 10 274 CrossRef.
  6. C. W. Allen, Chem. Rev., 1991, 91, 119 CrossRef CAS; H. R. Allcock, D. C. Ngo, M. Parvez and K. Visscher, J. Chem. Soc., Dalton Trans., 1992, 1687 RSC; L. G. Lund, N. L. Paddock, J. E. Proctor and H. T. Searle, J. Chem. Soc., 1960, 2542 RSC.
Click here to see how this site uses Cookies. View our privacy policy here.