15589-58-9Relevant articles and documents
One-step Synthesis of 3-Unsubstituted 4-Hydroxy-2(1H)-Quinoline
Menglin, Ma,Qingrong, Sun,Weiqing, Yang,Xingyi, Wang,Yinan, Xu
, p. 435 - 441 (2021/11/22)
3-Unsubstituted 4-hydroxy-2(1H)-quinolone (DHQ) derivatives were synthesized from aniline derivatives and diethyl malonate at low temperature using AlCl3 as catalyst and Eaton reagent as acidic environment. A reaction mechanism was proposed and elucidated. Different synthetic intermediates are specially prepared or purified and used to understand the reaction and validation mechanism.
Lanthanum(III)-Catalyzed Three-Component Reaction of Coumarin-3-carboxylates for the Synthesis of Indolylmalonamides and Analysis of Their Photophysical Properties
Jennings, Julia J.,Bhatt, Chinmay P.,Franz, Annaliese K.
, p. 6211 - 6222 (2016/08/16)
New methodology has been developed for the Lewis acid catalyzed synthesis of malonamides. First, the scandium(III)-catalyzed addition of diverse nucleophiles (e.g., indoles, N,N-dimethyl-m-anisidine, 2-ethylpyrrole, and 2-methylallylsilane) to coumarin-3-carboxylates has been developed to afford chromanone-3-carboxylates in high yields as a single diastereomer. Upon investigating a subsequent lanthanum(III)-catalyzed amidation reaction, a new multicomponent reaction was designed by bringing together coumarin-3-carboxylates with indoles and amines to afford indolylmalonamides, which were identified to exhibit fluorescent properties. The photophysical properties for selected compounds have been analyzed, including quantum yield, molar absorptivity, and Stokes shift. Synthetic studies of several reaction byproducts involved in the network of reaction equilibria for the three-component reaction provide mechanistic insight for the development of this methodology.
6-methoxy-2-oxo-1,2-dihydroquinoline-3,4-dicarbonitriles, a red compound class with solvent and pH independent green fluorescence maxima
Enoua,Lahm,Uray,Stadlbauer
, p. 492 - 501 (2014/04/17)
The sodium p-toluenesulfinate mediated reaction of potassium cyanide with 4-chlorocarbostyrils 8, 16, 18, and 23 gave in all cases the highly fluorescent and stable 6-methoxy-2-oxoquinoline-3,4-dicarbonitrile 9 (λexc 460 nm and λem 545 nm). This is remarkable, because starting carbostyrils 8, 16, 18, and 23 had a chloro substituent, a nitro substituent, an acetylamino substituent, or a piperidinyl substituent in position 3. Hence, we observed not only a substitution of the 4-chloro and expected 3-chloro substituents by the cyanide nucleophile but also an exchange of a nitro substituent, an acetylamino substituent, and a piperidinyl substituent in position 3. The multistep insertion of substituents leading to 8, 16, 18, and 23 started from 4-hydroxy-6-methoxyquinolone 4, easily obtained from p-anisidine and malonic acid. Substitutions in position 3 gave 4-hydroxy-3-nitro and 3-chloro intermediates, which were converted to 3,4-dichlorocarbostyril 8 and 4-chloro-3-nitrocarbostyril 16. Reduction of the 3-nitro intermediate led to the 3-acetylamino analog and subsequent chlorination led to 3-acetylamino-4- chlorocarbostyril 18. 4-Chloro-3-piperidinylcarbostyril 23 was obtained from intermediate 3,3-dichloroquinolinedione by subsequent amination, reduction and chlorination. Further, 3-acetylamino-4-chlorocarbostyril 18 gave with lithium p-toluenesulfinate highly fluorescent 3-amino-6-methoxy-4-p- tolylsulfonylquinolone 19.
