ISSN:
0009-2940
Keywords:
Chemistry
;
Inorganic Chemistry
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Description / Table of Contents:
Syntheses with Heterocyclic Amines, V. Further Reaction with 5-OxopyrazolopyrimidinesThe structure of 5-oxo-7-phenyl-4,5-dihydropyrazolo[1,5-a]pyrimidine (1c) (already ascribed on the basis of its spectra) has been confirmed by its transformation to 5-phenylpyrazolo-[1,5-a]tetrazolo[1,5-c]pyrimidine (4) and 5-phenylpyrazolo[1,5-a]-s-triazolo[4,3-c]pyrimidine (6). 4 is thermostable and is also formed by 1,5-dipolar cyclization of 5-azido-7-phenyl-pyrazolo[1,5-a]pyrimidine (7).
Notes:
Die bereits aufgrund der Spektren zugeordnete Struktur von 5-Oxo-7-phenyl-4.5-dihydropyrazolo[1.5-a]pyrimidin (1c) wird durch Überführung in 5-Phenyl-pyrazolo[1.5-α]tetrazolo[1.5-c]pyrimidin (4) und in 5-Phenyl-pyrazolo[1.5-a]-s-triazolo[4.3-c]pyrimidin (6) gesichert. 4 ist thermostabil und entsteht auch durch 1.5-Dipolare Cyclisierung von 5-Azido-7-phenyl-pyrazolo[1.5-a]pyrimidin (7).
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/cber.19711040725
