N-AMINATION OF PYRAZOLES - A GENERAL-APPROACH

Authors
VINOGRADOV VM DALINGER IL SHEVELEV SA
Citation
Vm. Vinogradov et al., N-AMINATION OF PYRAZOLES - A GENERAL-APPROACH, Mendeleev communications, (3), 1993, pp. 111-111
Citations number
6
Categorie Soggetti
Chemistry
Journal title
Mendeleev communications → ACNP
ISSN journal
09599436
Issue
3
Year of publication
1993
Pages
111 - 111
Database
ISI
SICI code
0959-9436(1993):3<111:NOP-AG>2.0.ZU;2-R
Abstract
A general approach to N-amination of pyrazoles, allowing the synthesis of previously inaccessible N-aminopyrazoles with electron-acceptor su bstituents in the ring, has been proposed, consisting of treatment of the pyrazoles with hydroxylamine-O-sulfonic acid in aqueous media at c ontrolled pH depending on pK(a) of the pyrazole.