A compound of formula (I)
where one of A
1
, A
2
or A
3
is N, and the others are independently selected from CH or N; ring B is a fused 5 or 6-membered carbocyclic or heterocyclic which is optionally substituted as defined in the specification, and R
1
, R
2
, R
3
, R
4
, and n are as defined in the specification.
The compounds are inhibitors of EphB4 or EphA2 and therefore may be useful in pharmaceutical compositions for the treatment of conditions such as cancer.
In this report, we present the synthesis of N8-glycosylated 8-aza-2-methylhypoxanthine and 8-aza-6-thiohypoxanthine 2'-deoxynucleosides as well as methylated 2'-deoxynebularine derivatives. In vitro base pairingproperties between each modified and canonical nucleobase were studied. As demonstrated by Tm, incorporation of the modified bases in DNA resulted, with few exceptions, in low stability of
Studies in the heterocyclic series. XVIII. Utilization of 4-aminopyrimidine chemistry in 1,4,7,9-tetraazabenzo[<i>b</i>]phenothiazine synthesis
作者:Charles O. Okafor
DOI:10.1002/jhet.5570170747
日期:1980.11
The synthesis of 1,4,7,9-tetraazabenzo[b]phenothiazine ring system from 4-aminopyrimidine is reported. This new heterocyclic ring was obtained by converting a 4-aminopyrimidine to the corresponding 5-thiocyanato derivative followed by hydrolysis and subsequent treatment with 2,3-dichloroquinoxaline. Several derivatives were obtained by using suitable substituted starting materials. Nitration with mixed
据报道由4-氨基嘧啶合成1,4,7,9-四氮杂苯并[ b ]吩噻嗪环系统。通过将4-氨基嘧啶转化为相应的5-硫氰酸根衍生物,然后水解并随后用2,3-二氯喹喔啉处理,获得了该新的杂环。通过使用合适的取代起始原料获得了几种衍生物。用硝酸和硫酸混合硝化得到相应的13-硝基衍生物。光谱分析与分配的结构一致。
A cascade reaction sequence en route to 7-substituted 2-aminopyrrolo[1,2-a]pyrimidine-4,6-diones and the corresponding acrylic acid derivatives
作者:Ju Gao、Rodger F. Henry、Thomas G. Pagano、Richard W. Duerst、Andrew J. Souers
DOI:10.1016/j.tetlet.2007.08.003
日期:2007.10
Reaction of α-bromo ketones with 6-amino-2-methylpyrimidin-4(3H)-one under basic conditions and in the presence of atmospheric oxygen affords novel 7-substituted 2-amino-pyrrolo[1,2-a]pyrimidine-4,6-diones that are readily hydrolyzed to afford the corresponding acrylic acid derivatives. The reaction sequence consists of an initial alkylation, followed by an unexpected condensation, elimination, and
在碱性条件下,在大气氧的存在下,α-溴代酮与6-氨基-2-甲基嘧啶-4(3 H)-one的反应提供了新型的7-取代的2-氨基-吡咯并[1,2- a ]嘧啶-4,6-二酮易于水解,得到相应的丙烯酸衍生物。反应顺序包括初始烷基化,然后进行意想不到的缩合,消除和氧化顺序,从而得到产物。该级联反应序列代表了通往所述小分子的快速且空前的途径。
Synthesis and Structure of New Pyrido[2,3-d]pyrimidine Derivatives with Calcium Channel Antagonist Activity
作者:Alfredo Pastor、Ramón Alajarin、Juan J. Vaquero、Julio Alvarez-Builla、Miguel Fau de Casa-Juana、Carlos Sunkel、Jaime G. Priego、Isabel Fonseca、Julia Sanz-Aparicio
DOI:10.1016/s0040-4020(01)85291-1
日期:1994.1
3-d]pyrimidine derivatives were synthesized by reaction of aryl-methyleneacetoacetates with different aminopyrimidines. The solid-state structure of the methyl 5-(3′-chlorophenyl)-7-methyl-4-oxo-2-thioxo-1,2,3,4,5,8-hexahydropyrido[2,3-d]pyrimidine-6-carboxylate shows that these compounds can adopt some of the most important structural features of the 1,4-dihydropyridinecalciumchannel blockers. The