A number of 5,7-diaryl-5,8-dihydropyrido[2,3-d]pyrimidines and 5,7-diarylpyrido[2,3-d]- pyrimidines were obtained by the reaction of 6-aminouracil derivatives with α,β-unsaturated ketones. Basic catalysts decrease yields of the dihydro derivatives whereas acids increase it. In the reactions of ketones containing the dimethylamino group, elimination of the aryl substituent from position 5 of the pyridopyrimidine system was observed. Some aspects of oxidation of 5,8-dihydropyrido[2,3-d]pyrimidines and synthesis of pyrido[2,3-d]pyrimidines were also investigated.
通过6-
氨基尿
嘧啶衍
生物与α,β-不饱和酮的反应,得到了一系列5,7-二芳基-5,8-二氢
吡咯[2,3-
d]
嘧啶和5,7-二芳基
吡啶[2,3-
d]
嘧啶。碱性催化剂会降低二氢衍
生物的产率,而酸性催化剂则会增加其产率。在含有
二甲氨基基团的酮反应中,观察到从
吡啶嘧啶系统的5位上消除芳基取代基的现象。此外,还研究了5,8-二氢
吡咯[2,3-
d]
嘧啶的氧化和
吡啶[2,3-
d]
嘧啶的合成的一些方面。