Heterocyclisations de sels d'iminium provenant de quelques β-amino-β-lactames et de leurs derives gem-difonctionnels
摘要:
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.
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.