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 enamine tautomer 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 side chain moieties. In general, the ratio of the enamine tautomer A was higher in the basic carbamoyl derivatives 7–11 than in the
7-氯-4-(2-氰基-2-羟基乙烯基)四唑并[1,5-α]喹喔啉2a与4-氨基吡啶,对甲苯胺或对氨基苯酚的反应得到7-氯-4-(4-吡啶基氨基甲酰基亚甲基)-4,5-二氢四唑[1,5-α]-喹喔啉7a,7-氯-4-(对甲苯甲氨基甲酰基亚甲基)4、5-二氢四唑[1,5-α]喹喔啉8a或7-氯-4 -(对-羟基苯基氨基甲酰基亚甲基)-4,5-二氢四唑并[1,5-α]喹喔啉9a。7-氯-4-(2-氰基-2-羟基乙烯基)-1,2,4-三唑并[4,3-α]喹喔啉2b与4-氨基吡啶,对甲苯胺或p的反应-氨基苯酚得到7-氯4-(4-吡啶基氨基甲酰基亚甲基)-4,5-二氢-1,2,4-三唑并-[4,3-α]喹喔啉7b,7-氯-4-(对甲苯基氨基甲酰基亚甲基)-4 ,5-二氢-1,2,4-三唑[4,3-α]喹喔啉8b或7-氯-4-(对羟基苯基氨基甲酰基亚甲基)-4,5-二氢-1,2,4-三唑[4, 3-α