Ring expansion of some 4-aminoazetidin-2-ones into 4-amino-5-iminopyrrolidin-2-ones
作者:C. Nisole、P. Uriac、L. Toupet、J. Huet
DOI:10.1016/s0040-4020(01)80331-8
日期:1993.1
Ring opening of 4-aminoazetidin-2-ones of three series (1-benzazepine, quinoline and linear analog) using trimethylsilyl cyanide (TMSCN) led stereospecifically to beta-cyanoamides which could cyclize into 4-amino-5-iminopyrrolidin-2-ones in the presence of AlCl3. These heterocycles were also prepared by one-pot reaction (TMSCN + AlCl3). A structural study of these compounds was performed, including X-ray.
Heterocyclisations de sels d'iminium provenant de quelques β-amino-β-lactames et de leurs derives gem-difonctionnels
Beta-amino-beta-lactams and their gem-difunctional derivatives of two series (1-benzoazepine and linear analog) lead stereospecifically to two types of heterocycles in strong acidic medium. Iminium ions and benzylic carbocations are proposed as reactive intermediates.
Effect of Polyamine Homologation on the Transport and Biological Properties of Heterocyclic Amidines
essentially tested to determine the influence of the polyamine chain on their cellular transport. To comment on affinity and on selective transport via the polyaminetransport system (PTS), K(i) values for polyamine uptake were determined in L1210 cells, and the cytotoxicity and accumulation of the conjugates were determined in CHO and polyamine transport-deficient mutant CHO-MG cells, as well as in