Synthese neuer N-Aroylisothiazol-2-imine und N-Aroylamino-isothiazoliumsalze durch Cyclisierung von thiocyanato-substituierten Hydrazonen
摘要:
The synthesis of new N-aroylisothiazole-2-imines (4g-n) as well as the corresponding acceptor-substituted 2-amino-isothiazolium salts (6f-n) by cyclocondensation of thiocyanatovinylaldehyde hydrazones (3) is reported. The structure of these N-imines was proved by spectroscopic methods. The alternative cyclization route to 1,2,3-thiadiazines (8) is not observed. The hydrazones (3a-e) could not be cyclized to N-imines, only sulfides (5a-c) were obtained. The reaction of 2-thiocyanatomethylen-cycloheptan-2-one (9) with benzhydrazides gave the same ring closure to the salts (10a,b). The structure of the N-imine 11b has been confirmed unequivocally by X-ray structure analysis.
Synthesis of novel N-aroyl- and N-arylsulfonylisothiazole-2-imines by cyclization of thiocyanatovinylaldehyde hydrazones
摘要:
The synthesis of N-aroyl- and N-arylsulfonylisothiazole-2-imines 7c-f as well as the corresponding acceptor-substituted 2-aminoisothiazolium salts 8c-f by cyclocondensation of thiocyanatovinylaldehyde hydrazones 6c-f is reported. The alternative Cyclization route to 1,2,3-thiadiazines is not observed.
The synthesis of N-aroyl- and N-arylsulfonylisothiazole-2-imines 7c-f as well as the corresponding acceptor-substituted 2-aminoisothiazolium salts 8c-f by cyclocondensation of thiocyanatovinylaldehyde hydrazones 6c-f is reported. The alternative Cyclization route to 1,2,3-thiadiazines is not observed.
Synthese neuer N-Aroylisothiazol-2-imine und N-Aroylamino-isothiazoliumsalze durch Cyclisierung von thiocyanato-substituierten Hydrazonen
The synthesis of new N-aroylisothiazole-2-imines (4g-n) as well as the corresponding acceptor-substituted 2-amino-isothiazolium salts (6f-n) by cyclocondensation of thiocyanatovinylaldehyde hydrazones (3) is reported. The structure of these N-imines was proved by spectroscopic methods. The alternative cyclization route to 1,2,3-thiadiazines (8) is not observed. The hydrazones (3a-e) could not be cyclized to N-imines, only sulfides (5a-c) were obtained. The reaction of 2-thiocyanatomethylen-cycloheptan-2-one (9) with benzhydrazides gave the same ring closure to the salts (10a,b). The structure of the N-imine 11b has been confirmed unequivocally by X-ray structure analysis.