Chemo-, Regio-, and Stereoselective Trifluoromethylation of Styrenes via Visible Light-Driven Single-Electron Transfer (SET) and Triplet–Triplet Energy Transfer (TTET) Processes
作者:Qing-Yu Lin、Xiu-Hua Xu、Feng-Ling Qing
DOI:10.1021/jo502040t
日期:2014.11.7
A process for tunable and chemo-, regio-, and stereoselective photocatalytic trifluoromethylation of styrenes was developed. Thermodynamically stable E-trifluoromethylated alkenes were prepared using Togni’s reagent in the presence of Ru(bpy)3Cl2·6H2O under visible light irradiation, whereas less thermodynamically stable Z-trifluoromethylated alkenes were obtained by employing Umemoto’s reagent and
The present invention provides a novel compound that is structurally similar to curcumin and has a suppressive effect on Aβ aggregation, a degradative effect on Aβ aggregates, an inhibitory effect on β-secretase, and a protective effect on neurons. The novel compound is a compound represented by the following general formula (Ia) or a salt thereof:
wherein R
1
represents a 4-hydroxy-3-methoxyphenyl group or the like, and R
2
represents a 1H-indol-6-yl group or the like.
The present invention provides a novel compound that is structurally similar to curcumin and has a suppressive effect on Aβ aggregation, a degradative effect on Aβ aggregates, an inhibitory effect on β-secretase, and a protective effect on neurons. The novel compound is a compound represented by the following general formula (Ia) or a salt thereof:
wherein R1 represents a 4-hydroxy-3-methoxyphenyl group or the like, and R2 represents a 1H-indol-6-yl group or the like.
作者:Nadezhda S. Baleeva、Alexander Yu. Smirnov、Elvira R. Zaitseva、Dmitrii S. Ivanov、Anatolii I. Sokolov、Andrey A. Mikhaylov、Ivan N Myasnyanko、Mikhail S. Baranov
DOI:10.1039/d3nj01837g
日期:——
ortho-Dialkylaminoarylidene malonates undergo hydrogen transfer mediated cyclization in the absence of a catalyst under LED irradiation. This activation mode is found to be relatively general and could be applied to a number of other acceptor motifs in the arylidene substrates tested. Variation of the light source wavelength opens an extra option for fine tuning of the reaction conditions, making the
邻二烷基氨基亚芳基丙二酸酯在没有催化剂的情况下在 LED 照射下经历氢转移介导的环化。发现这种激活模式相对通用,并且可以应用于测试的亚芳基底物中的许多其他受体基序。光源波长的变化为反应条件的微调提供了额外的选择,使得所描述的方法几乎通用。
Synthesis of 2H-[1,2]oxazino[3,4-c]quinoline-2,5(6H)-diones from 6-oxo-6H-1,2-oxazine-3-carboxylates
作者:Elvira R. Zaitseva、Dmitry S. Ivanov、Alexander Yu. Smirnov、Nadezhda S. Baleeva、Mikhail S. Baranov
DOI:10.1007/s10593-023-03201-2
日期:2023.5
A methodology was developed for the synthesis of 1-ethoxy-6-methyl-2H-[1,2]oxazino[3,4-c]quinoline-2,5(6H)-diones from methyl 4-[2-(dimethylamino)phenyl]-5-ethoxy-6-oxo-6H-1,2-oxazine-3-carboxylates by the action of titanium tetrachloride under inert atmosphere. This interaction provides a rare example of demethylation followed by cyclization, yielding several new compounds.
开发了一种从甲基 4-[2- 合成 1-乙氧基-6-甲基-2 H -[1,2]恶嗪基[3,4- c ]喹啉-2,5(6 H )-二酮的方法(二甲基氨基)苯基]-5-乙氧基-6-氧代-6H- 1,2-恶嗪-3-羧酸酯在惰性气氛下与四氯化钛作用。这种相互作用提供了去甲基化随后环化的罕见例子,产生了几种新化合物。