Twenty-seven oxadiazolino[5,4-d][1,5]benzodiheteropine derivatives have been synthesized by the 1,3-dipolar cycloaddition of benzodiheteropines with nitrile oxide 1,3-dipoles,their conformations and the characteristic...Twenty-seven oxadiazolino[5,4-d][1,5]benzodiheteropine derivatives have been synthesized by the 1,3-dipolar cycloaddition of benzodiheteropines with nitrile oxide 1,3-dipoles,their conformations and the characteristics of the newly formed oxadiazoline fused on them have been studied.It has also been found that the mass spectra show characteristic fragmentation patterns.展开更多
The signals of 1H NMR and 13 C NMR for benzodiheteropine 1 and its cycloaddtion products 2～5 were assigned by two dimensional NMR techniques. The characteristics of their structures were analyzed and ...The signals of 1H NMR and 13 C NMR for benzodiheteropine 1 and its cycloaddtion products 2～5 were assigned by two dimensional NMR techniques. The characteristics of their structures were analyzed and discussed. The boat conformation of the seven membered heteroatomic ring in these structures was interpreted on the basis of the spectrum of NOESY as well. The coupling constants of relative protons were in accord with above results.展开更多
文摘Twenty-seven oxadiazolino[5,4-d][1,5]benzodiheteropine derivatives have been synthesized by the 1,3-dipolar cycloaddition of benzodiheteropines with nitrile oxide 1,3-dipoles,their conformations and the characteristics of the newly formed oxadiazoline fused on them have been studied.It has also been found that the mass spectra show characteristic fragmentation patterns.
文摘The signals of 1H NMR and 13 C NMR for benzodiheteropine 1 and its cycloaddtion products 2～5 were assigned by two dimensional NMR techniques. The characteristics of their structures were analyzed and discussed. The boat conformation of the seven membered heteroatomic ring in these structures was interpreted on the basis of the spectrum of NOESY as well. The coupling constants of relative protons were in accord with above results.
