发光镧系元素配合物(Tb3+、Eu3+ 等)具有出色的生物学应用特性,包括极长的寿命和大的斯托克斯位移。然而,由于难以设计具有发光开/关开关的合适配合物,因此很少有关于基于镧系元素的功能探针的报道。在这里,我们合成了一系列由三个部分组成的复合物:镧系元素螯合物、天线和发光开关。天线是一个吸收光并将其能量传递给金属的芳环,开关是一个不同HOMO能级的苯衍生物。如果 HOMO 能级高于某个阈值,则复合物根本不发光,这表明镧系元素发光可以通过从开关到敏化剂的光诱导电子转移(PeT)进行调制。这种控制镧系元素发光的方法使功能性镧系元素配合物的合理设计成为可能,其中...
Cyclization of Polarized Divinyl Ketones under Aqueous and Ambient Conditions
作者:Anton V. Yadykov、Liana V. Yaminova、Mikhail M. Krayushkin、Valerii Z. Shirinian
DOI:10.1002/adsc.202000956
日期:2021.1.5
applicability on a gram‐scale. It was shown that the amphiphilicity of the substrate and a low energy barrier of the reaction are a prerequisite for electrophilic and concerted reactions underaqueous and ambient conditions.
A versatile route to potential dihydrofolate reductase inhibitors<i>via</i>the hitherto unknown 6-benzyl-2-(<i>O</i>-methyl)uracils: Synthesis of isotrimethoprim
The synthesis of 2, 4-diamino-6-(3, 4, 5-trimethoxybenzyl)pyrimidine (isotrimethoprim) has been accomplished starting from 2-(O-methyl)-6-(3, 4, 5-trimethoxybenzyl)uracil by standard procedures. The benzyluracil derivative has been obtained by reacting O-methylisourea sulphate and ethyl 3, 4, 5-trimethoxyphenacetylace-tate.
Divergent Reactivity of Triaryldivinyl Ketones: Competing 4π and Putative 6π Electrocyclization Pathways
作者:Anton V. Yadykov、Artem E. Eremchenko、Aleksa Milosavljevic、Alison J. Frontier、Valerii Z. Shirinian
DOI:10.1021/acs.joc.2c01294
日期:2022.11.4
acid-promoted cyclization of triaryldivinyl ketones containing a thiophene moiety in the α-position. Two cyclization pathways are accessible: one a 4π-Nazarov cyclization and the other we propose to proceed through a 6π electrocyclic mechanism. The relative proportion of products from these divergent pathways is affected by reaction conditions and steric bulk in the substrate. We present experimental