27282-89-9Relevant articles and documents
NOVEL COMPOUNDS
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Page 37-38, (2010/02/08)
The invention relates to pyridine derivatives of formula (I) where the variables are defined in the specification.Processes for the preparation of these compounds together with pharmaceutical compositions containing them and their use in therapy in particular in the modulation of autoimmune disease is also described.
Synthese regiospecifique d'acyl-4 pyrazoles a partir d'acyl-5 pyrimidines
Bajnati, Abdelilah,Kokel, Bruno,Hubert-Habart, Michel
, p. 318 - 324 (2007/10/02)
The transformation of variously substituted 5-acetyl-4-methylpyrimidines 1 into 4-acetyl-1-amidino-3-methylpyrazole amidinohydrazone dihydrochloride 3, under the action of amidinohydrazine hydrochloride, in boiling acidic methanolic solution, depends on the nature of the 2-substituent of pyrimidines 1, and on the stability of the amidinohydrazone of pyrimidines 2 under the reaction conditions.Phenylhydrazine transforms all the pyrimidines 1 into pyrazoles, regiospecifically or not, according to the nature of the 2-substituent of pyrimidines 1.This new possibility of ring contraction has been extended to other unsymetrical 5-acyl- and 5-ethoxycarbonylpyrimidines.