Three kinds of pyridopyrimidines were synthesized from appropriate pyrimidine derivatives. Cross-coupling of 4-amino-5-iodopyrimidines with α, β-unsaturated carboxylic esters followed by ring-closure afforded pyrido [2, 3-d] pyrimidines. Ammonolysis of 4-ethoxycarbonyl-5-phenylethynyl-and 5-ethoxycarbonyl-4-phenyl-ethynyl-pyrimidines which were obtained by cross-coupling of the corresponding halopyrimidines with phenylacetylene, gave pyrido [3, 4-d]-and pyrido [4, 3-d]-pyrimidines, respectively.
由适当的
嘧啶衍
生物合成了三种
吡啶嘧啶。4-amino-5-iodopyrimidines 与 α, β-unsaturated carboxylic esters 发生交叉偶联,然后进行闭环反应,得到
吡啶并[2, 3-d]
嘧啶。4- 乙氧羰基-5-苯基
乙炔基和 5- 乙氧羰基-4-苯基
乙炔基
嘧啶通过相应的卤代
嘧啶与
苯乙炔的交叉偶联得到了
吡啶并[3,4-d]
嘧啶和
吡啶并[4,3-d]
嘧啶。