Enaminones as building blocks in heterocyclic synthesis: New syntheses of nicotinic acid and thienopyridine derivatives
作者:Mervat Mohammed Abdelkhalik、Afaf Mohammed Eltoukhy、Samia Michel Agamy、Mohammed Hilmy Elnagdi
DOI:10.1002/jhet.5570410321
日期:2004.5
8-trisubstituted pyrido[2′,3′:2,3] thieno[4,5-d]pyrimidine 12. Compound 4 also afforded 2,5,6-trisubstituted nicotinic acid ethyl ester 13 by reaction with ethyl acetoacetate in acetic acid in the presence of ammonium acetate. The dienaminone 5 reacted with acetic acid, ammonium acetate/acetic acid, phenylhydrazine and 5-amino-3-methylpyrazole yielding 3,5-diphenyl-pyran-4-one 15a, 3,5-diphenyl-1H-pyridin-4-one
使1,3-二苯基-丙烷-2-酮与等摩尔量的二甲基甲酰胺二甲基缩醛反应,得到烯胺酮4。这与另一等分子量的二甲基甲酰胺二甲基缩醛反应得到二烯胺酮5。化合物4与氰基硫代乙酰胺和氰基乙酰胺缩合得到2-硫代-和2-氧代吡啶-3-腈衍生物6a,b。化合物6a与α-氯丙酮8反应生成噻吩并[2,3- b ]吡啶衍生物10,其进一步环化成4,7,8-三取代吡啶并[2',3':2,3]噻吩并[4,5] -d]嘧啶12.化合物4还通过在乙酸铵存在下与乙酰乙酸乙酯在乙酸中反应,得到2,5,6-三取代的烟酸乙酯13。二烯胺5与乙酸,乙酸铵/乙酸,苯肼和5-氨基-3-甲基吡唑反应生成3,5-二苯基-吡喃-4-酮15a,3,5-二苯基-1 H-吡啶-4-一个15b和1,3,5-三取代的吡啶-4-酮16a-b。