19063-55-9Relevant articles and documents
Dicyanovinylcoumarin as a turn-on fluorescent sensor for cyanide ion
Reddy, T. Sheshashena,Choi, Myung-Seok
, p. 108 - 114 (2018)
Dicyanovinylcoumarin chemosensors (4a, 4b and 4c) were designed and synthesized by the Knoevenagel condensation reaction. The electronic absorption and emission spectra of the dicyanovinylcoumarin isomers exhibited red shifted absorption and less emission as compared to their precursor's coumarin aldehydes. The sensing behavior of dicyanovinylcoumarin isomers were studied for different anions. In these dicyanovinylcoumarin isomers, the 7-substituted isomer shows high selectivity towards CN? in the presence of other F?, Cl?, Br?, I?, ClO4?, HSO4? and NO2? ions. The effect of CN? on the structure of dicyanovinylcoumarin isomer was studied by performing DFT calculations. The theoretical calculations show strong agreement with the experimental results. The detection limit for CN? were found to be 1.14 × 10?8 M for 7-substitued dicyanovinylcoumarin isomer 4b.
Synthesis of analogues of natural coumarins and coumarinolignans
Ismailova
, p. 292 - 296 (2005)
3-Aryl-4H-coumarins with the 1,3-benzodioxol, 1,4-benzodioxane, and 1,5-benzodioxepane moieties were synthesized by modified methods.
Polyphosphoric acid-promoted synthesis of coumarins lacking substituents at positions 3 and 4
Yang, Li-Shou,Wang, Yu,Wang, En-Hua,Yang, Jan,Pan, Xiong,Liao, Xiu,Yang, Xiao-Sheng
, p. 1 - 6 (2020)
Coumarins have recently emerged as a hot topic of research due to their diverse pharmacological properties. This work described a method for the synthesis of 3,4-diunsubstituted coumarins promoted by polyphosphoric acid (PPA) from salicylaldehydes and acetic anhydride. Various coumarins were produced in good to excellent yields.
Fe(III)-Catalyzed Decarboxylative C3-Difluoroarylmethylation of Coumarins with α,α-Difluoroarylacetic Acids
Chen, Zhiwei,Bai, Xiang,Sun, Jie,Xu, Yicheng
supporting information, p. 7674 - 7682 (2020/07/15)
A facile Fe(III)-catalyzed oxidative decarboxylative radical coupling reaction of α,α-difluoroarylacetic acids with coumarins has been developed. This transformation, which provides a series of C-3 difluoroarylmethylated coumarins containing various functional groups in moderate-to-good yields, features easily accessible starting materials and operational simplicity.
Visible-light-induced regioselective alkylation of coumarins via decarboxylative coupling with N-hydroxyphthalimide esters
Jin, Can,Yan, Zhiyang,Sun, Bin,Yang, Jin
supporting information, p. 2064 - 2068 (2019/04/11)
An efficient photocatalytic decarboxylative 3-position alkylation of coumarins by using alkyl N-hydroxyphthalimide esters as alkylation reagents has been developed. A variety of NHP esters derived from aliphatic carboxylic acids (primary, secondary, and tertiary) has been proved to be tolerated for this decarboxylation process, affording a broad scope of 3-alkylated coumarin derivatives in moderate to excellent yields. This protocol was highlighted by its mild conditions, readily available starting materials, operational simplicity, and wide functional group tolerance.