Synthesis of 4H-thieno[3,2-c]chromenes by intramolecular arylation of 4-aryloxy-methyl-5-iodothiophene-2-carbaldehydes
摘要:
The iodination of 4-chloromethylthiophene-2-carbaldehyde by N-iodosuccinimide under solvent-free conditions gives 4-chloromethyl-5-iodothiophene-2-carbaldehyde, which is used to obtain 4-aryloxy-methyl-5-iodothiophene-2-carbaldehydes. The palladium-catalyzed intramolecular cyclization of 4-aryloxymethyl-5-iodothiophene-2-carbaldehydes yields 4H-thieno[3,2-c]chromene-2-carbaldehydes.
通过在K 2的存在下容易获得的4-氯甲基噻吩-2-甲醛与N-(2-卤代苯基)取代的乙酰胺,4-甲基苯磺酰胺和氨基甲酸酯的反应来制备N保护的4-(苯胺基甲基)噻吩-2-甲醛CO 3或Cs 2 CO 3。通过钯催化的分子内环化反应,在均相或异相(Pd / C)条件下以良好的收率将所得化合物转化为4,5-二氢噻吩并[3,2- c ]喹啉-2-甲醛。取代噻吩[3,2- c]喹啉衍生物(腈,羧酰胺,羧酸,酯)。2-功能性的光学特性被取代的噻吩并[3,2- c ^ ]喹啉和4H-噻吩并[3,2- c ^ ]色烯进行了研究。对于这些化合物,观察到中等至高的荧光量子产率,范围为0.15至0.87。已经建立了所合成化合物的结构-光学性质关系,并且已实际证明了它们作为不可见油墨染料的前瞻性应用。
Photochemical Synthesis of 4H-Thieno[3,2-c]chromene and Their Optical Properties
作者:Alexander S. Fisyuk、Evgeny B. Ulyankin、Yulia P. Bogza、Anastasia S. Kostyuchenko、Sergey A. Chernenko、Anna L. Samsonenko、Anton L. Shatsauskas、Vyacheslav L. Yurpalov
DOI:10.1055/a-1392-2209
日期:2021.5
analysis of ring-closure methods showed that photochemical cyclization of 5-iodo-4-(aryloxymethyl)thiophene-2-carbaldehyde is superior to Pd-catalyzed intramolecular arylation. A series of substituted 4H-thieno[3,2-c]chromene-2-carbaldehydes were synthesized by the photochemical cyclization of the corresponding precursors, and the photophysical properties of the products were studied. The 4H-thieno[3
Novel inhibitors of tyrosinase produced by the 4-substitution of TCT (П)
作者:Jing Liu、Mengrong Li、Yanying Yu、Shuwen Cao
DOI:10.1016/j.ijbiomac.2017.05.036
日期:2017.10
Spectrofluorimetry, 1H and 13C NMR titration and Molecular docking had been used to investigate their inhibitory activities and mechanisms on tyrosinase. The results showed that the inter-molecular interactions or hydrogen bond formation by increasing length of carbon chain or introducing benzene ring to the 4-functionalized ester group promoted or stabilized formation of complexesbetween modifier and tyrosinase