An influence of a basic side chain moiety on the tautomer ratio between the enamine and methylene imine forms in azole condensed quinoxalines
作者:Yoshihisa Kurasawa、Yuko Matsumoto、Aiko Ishikura、Kazue Ikeda、Tomoyoshi Hosaka、Atsushi Takada、Ho Sik Kim、Yoshihisa Okamoto
DOI:10.1002/jhet.5570300545
日期:1993.10
trifluoroacetic acid solution. Moreover, the ratio of the enaminetautomer A elevated in an order of compound 11 (3-pyridylcarbamoyl), compound 10 (2-pyridylcarbamoyl) and compound 7a (4-pyridylcarbamoyl), reflecting an order of the increase in the pKa values of the aminopyridine sidechainmoieties. In general, the ratio of the enaminetautomer A was higher in the basic carbamoyl derivatives 7–11 than in the