1 Results Sulfonylsemicarbazide derivatives are important compounds as blowing agents in cellular rubber and plastics[1]. Different methods for the preparation of these compounds are reported. For example, sulfonylsem...1 Results Sulfonylsemicarbazide derivatives are important compounds as blowing agents in cellular rubber and plastics[1]. Different methods for the preparation of these compounds are reported. For example, sulfonylsemicarbazides are prepared by reaction of sulfinic acid salt with azodicarbonamide in water[2] and reaction of sulfonylchloride with semicarbazide[3-4]. In these methods the yields of products are not high[3-4], the solvent such as pyridine is toxic and also the sulfinic acid salt as starting...展开更多
A convenient synthesis of various heterocyclic substituted ureidoalkylphosphonic acid diphenyl esters 3 is reported in this paper,alpha-Aminoalkylphosphonic acid diphenyl esters 1 reacted with triphosgene,and then tre...A convenient synthesis of various heterocyclic substituted ureidoalkylphosphonic acid diphenyl esters 3 is reported in this paper,alpha-Aminoalkylphosphonic acid diphenyl esters 1 reacted with triphosgene,and then treated with heterocyclic amines gave 3.Small amount of symmetric urylenediphosphonate 4 are isolated as side products.展开更多
A variety of novel N-t-butyl-N'-aminocarbonyl-N-(substitute)Benzoylhydrazines containing α-aminoalkylphosphonate groups were synthesized by the addition of N-t-butyl-N- (substituted)benzoylhydrazines to α-isocya...A variety of novel N-t-butyl-N'-aminocarbonyl-N-(substitute)Benzoylhydrazines containing α-aminoalkylphosphonate groups were synthesized by the addition of N-t-butyl-N- (substituted)benzoylhydrazines to α-isocyanatoalkylphosphonates. which were synthesized by the reaction of α-aminoalkylphosphonates with triphosgene in good yields. The structures of products including by-products were confirmed by 1H NMR, 31P NMR. IR, mass spectroscopy- and elemental analysis.展开更多
A practical synthetic method for methyl 1-oxo-1,2,3,4-tetrahydroisoquinoline-3-carboxylate was developed by means of triphosgene. Several analogues were prepared by this new method.
文摘1 Results Sulfonylsemicarbazide derivatives are important compounds as blowing agents in cellular rubber and plastics[1]. Different methods for the preparation of these compounds are reported. For example, sulfonylsemicarbazides are prepared by reaction of sulfinic acid salt with azodicarbonamide in water[2] and reaction of sulfonylchloride with semicarbazide[3-4]. In these methods the yields of products are not high[3-4], the solvent such as pyridine is toxic and also the sulfinic acid salt as starting...
文摘A convenient synthesis of various heterocyclic substituted ureidoalkylphosphonic acid diphenyl esters 3 is reported in this paper,alpha-Aminoalkylphosphonic acid diphenyl esters 1 reacted with triphosgene,and then treated with heterocyclic amines gave 3.Small amount of symmetric urylenediphosphonate 4 are isolated as side products.
基金This project was supported by the National Natural Science Foundation of Chinathe Natural Science Foundation of Tianjin.
文摘A variety of novel N-t-butyl-N'-aminocarbonyl-N-(substitute)Benzoylhydrazines containing α-aminoalkylphosphonate groups were synthesized by the addition of N-t-butyl-N- (substituted)benzoylhydrazines to α-isocyanatoalkylphosphonates. which were synthesized by the reaction of α-aminoalkylphosphonates with triphosgene in good yields. The structures of products including by-products were confirmed by 1H NMR, 31P NMR. IR, mass spectroscopy- and elemental analysis.
文摘A practical synthetic method for methyl 1-oxo-1,2,3,4-tetrahydroisoquinoline-3-carboxylate was developed by means of triphosgene. Several analogues were prepared by this new method.
