Nitrogen bridgehead compounds. Part<b>65</b>. Vilsmeier-haack formylation of 4<i>H</i>-pyrido[1,2-<i>a</i>]pyrimidin-4-ones. Part<b>6</b>
作者:ÁGnes Horváth、István Hermecz
DOI:10.1002/jhet.5570230507
日期:1986.9
2-Substituted 3-formyl-4H-pyrido[1,2-a]pyrimidin-4-ones can be synthethized by Vilsmeier-Haack formylation with the dimethylformamide-phosphoryl chloride complex only from those 4H-pyrido[1,2-a]pyrimidin-4-ones which contain a substituent with electron-releasing resonance effect in position 2. The products were characterized by uv, ir and 1H nmr spectroscopy.
2-取代的3-甲酰基-4- ħ -吡啶并[1,2-一个]嘧啶-4-酮可以通过维尔斯迈尔-哈克甲酰化与二甲基甲酰胺,磷酰氯只对4络合物synthethized ħ -吡啶并[1,2- a ]嘧啶-4-酮,其在2位含有具有电子释放共振效应的取代基。产物通过uv,ir和1 H nmr光谱表征。
Solvent-Free Synthesis of 4<i>H</i>-Pyrido[1,2-<i>a</i>]pyrimidin-4-ones Catalyzed by BiCl<sub>3</sub>: A Green Route to a Privileged Backbone
作者:Irwan I. Roslan、Qiu-Xuan Lim、Aijuan Han、Gaik-Khuan Chuah、Stephan Jaenicke
DOI:10.1002/ejoc.201500227
日期:2015.4
An extensive array of 4H-pyrido[1,2-a]pyrimidin-4-ones have been synthesized from commercially available 2-aminopyridines and β-oxo esters with excellent yields under solvent-free conditions. The reaction, catalyzed by cheap and nontoxic BiCl3, proceeds with short reaction times under mild conditions and normal atmosphere. Only water and alcohol are formed as co-products in this green reaction.
Simple and efficient protocol for synthesis of pyrido[1,2-a]pyrimidin-4-one derivatives over solid heteropolyacid catalysts
作者:Sulaiman N. Basahel、Nesreen S. Ahmed、Katabathini Narasimharao、Mohamed Mokhtar
DOI:10.1039/c5ra22180c
日期:——
of surface area and Lewis acid sites was observed with increase of Al content. The catalysts have been applied as heterogeneous catalysts to synthesize pyrido[1,2-a]pyrimidines under mild reaction conditions. A variety of biologically active pyrido[1,2-a]pyrimidines were obtained in best yields ever (above 90%) by using a simple, eco-friendly and efficient protocol catalyzed by AlxH3−xPW12O40 catalysts
采用简单的离子交换法制备了具有Keggin结构的铝交换钨磷酸盐(Al x H 3− x PW 12 O 40)。通过各种技术,如元素分析,XRD,FTIR,UV-vis,N 2-物理吸附,NH 3 -TPD和FTIR-吡啶吸附,对制备的杂多酸盐进行了表征。所有制备的催化剂都具有布朗斯台德和路易斯酸位点,但是随着铝含量的增加,表面积和路易斯酸位点增加。该催化剂已被用作非均相催化剂,以在温和的反应条件下合成吡啶并[1,2- a ]嘧啶。多种具有生物活性的吡啶基[1,2-通过使用由Al x H 3− x PW 12 O 40催化剂催化的简单,环保和高效的方法,可以以最高的收率(90%以上)获得a ]嘧啶。Al 3 PW 12 O 40催化剂显示出最高的活性,这是由于通过Al 3+离子完全交换H +离子将更多的路易斯酸位引入母体H 3 PW 12 O 40。
Electronic structure of 4<i>H</i>-pyrido[1,2-<i>a</i>]pyrimidin-4-ones
The characteristic features of ir and uv spectra of 43 4H-pyrido[1,2-a]pyrimidin-4-one derivatives with electron donor or acceptor groups in position 3, and positions 6, 7, 8, or 9, respectively, have been systematically studied. On the basis of the spectra some conclusions have been drawn for the molecular structure. The negative solvent effect of the lowest-energy π → π* transition is investigated
分别在3位和6、7、8或9位带有电子给体或受体的43 4 H-吡啶并[1,2- a ]嘧啶-4-酮衍生物的ir和uv光谱的特征,已经被系统地研究过了。根据光谱,得出了分子结构的一些结论。通过PPP方法研究了最低能量π→π*跃迁的负溶剂效应。
PYRIMIDODIAZEPINONE COMPOUND
申请人:Otsubo Nobumasa
公开号:US20140171422A1
公开(公告)日:2014-06-19
Provided are a compound represented by general formula (I), or the pharmaceutically acceptable salt thereof,
(wherein R
a
represents a hydrogen atom or the like, R
1
and R
2
may be the same or different, and each represents a hydrogen atom, optionally substituted lower alkyl or cycloalkyl, or R
1
and R
2
are combined together with the adjacent nitrogen atom thereto to form nitrogen-containing heterocyclic group, and Z represents a bicyclic heterocyclic group in which optionally substituted two six-membered rings are fused to each other, or the like) and the like.