Voici les éléments 1 - 4 sur 4
  • Publication
    Métadonnées seulement
    Preparation of N-alkylketene-N-butadienyl-N,O-silyl acetals
    (1996)
    Franz, Andreas
    ;
    Eschler, Pierre Yves
    ;
    Tharin, Manuel
    ;
    ;
    The synthesis of a series of dienamides 5a-j using Oppolzer's method is described. Using Rathke's method the ketene N,O-silyl acetals 6a-j can be obtained in good yield from the corresponding dienamides. The ketene acetals are obtained free of base and free of salts. They are stable and can be stored at - 20 degrees C. The new dienes are useful reagents for tandem reactions.
  • Publication
    Métadonnées seulement
    The preparation and the cascade reactions of N-butadienyl-N-alkylketene N,O-tert-butyldimethylsilyl acetals
    (: Pergamon-Elsevier Science Ltd, 1996)
    Franz, Andreas
    ;
    Eschler, Pierre Yves
    ;
    Tharin, Manuel
    ;
    The preparation of N-butadienyl-N-alkylketene N,O-tert-butyldimethylsilyl acetals (11a-d) from readily available starting materials is described. The cascade Diels-Alder reaction followed by acylation of these ketene acetals yields bicyclic and tricyclic products 7, 13a,b and 14c,d with high diastereoselectivity. Copyright (C) 1996 Elsevier Science Ltd
  • Publication
    Métadonnées seulement
    An Unexpected Tandem Reaction of N-Butadienyl-N-Alkylketene-N, O-Silylacetals
    (: The Royal Society of Chemistry, 1996)
    Franz, Andreas
    ;
    Eschler, Pierre Yves
    ;
    Tharin, Manuel
    ;
    ;
    Rzepa, H.J.
    ;
    Leach, C.
    ;
    Goodman, J.M.
  • Publication
    Accès libre
    Preparation of N-Alkylketene-N-Butadienyl-N,O-Silyl Acetals
    (1996)
    Franz, Andreas
    ;
    Eschler, Pierre-Yves
    ;
    Tharin, Manuel
    ;
    ;
    The synthesis of a series of dienamides 5a-j using Oppolzer’s method is described. Using Rathke’s method the ketene N,O-silyl acetals 6a-j can be obtained in good yield from the corresponding dienamines. The ketene acetals are obtained free of base and free of salts. They are stable and can be stored at -20°C. The new dienes are useful reagents for tandem reactions.