Studies on pyrimidine derivatives. XXVIII. Synthesis of pyridopyrimidine derivatives by cross-coupling of halopyrimidines with olefins and acetylenes.
作者:TAKAO SAKAMOTO、YOSHINORI KONDO、HIROSHI YAMANAKA
DOI:10.1248/cpb.30.2410
日期:——
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。