22618-22-0Relevant articles and documents
Vinyl Phosphonic Acid Functionalized Silica Polymer Nanocomposites for the Acylation of Phenol
Amit, Dubey,Verma, Savita
, p. 724 - 733 (2022/01/13)
Abstract: In order to overcome the corrosive problems of homogeneous vinyl phosphonic acid (VPA), ordered mesoporous silica (SBA-15) is functionalized with VPA via in situ radical polymerization method to achieve SBA/VPA nanocomposites with different amou
Substrate substitution effects in the Fries rearrangement of aryl esters over zeolite catalysts
Bonrath, Werner,Létinois, Ulla,Lin, Ronghe,Medlock, Jonathan,Mitchell, Sharon,Netscher, Thomas,Pérez-Ramírez, Javier,Stemmler, René T.
, p. 4282 - 4292 (2020/07/30)
The catalytic transformation of aryl esters to hydroxyacetophenones via Fries rearrangement over solid acids is of interest to avoid the use of corrosive and toxic Lewis and Br?nsted acids traditionally applied. Microporous zeolites are known to catalyze the reaction of simple substrates such as phenyl acetate, but their application to substituted derivatives has received limited attention. To refine structure-activity relationships, here we examine the impact of various parameters including the solvent polarity, water content, acidic properties, and framework type on the reaction scheme in the Fries rearrangement of p-tolyl acetate over common solid acids. The results confirm the importance of providing a high concentration of accessible Br?nsted acid sites, with beta zeolites exhibiting the best performance. Extension of the substrate scope by substituting methyl groups in multiple positions identifies a framework-dependent effect on the rearrangement chemistry and highlights the potential for the transformation of dimethylphenyl acetates. Kinetic studies show that the major competitive path of cleavage of the ester C-O bond usually occurs in parallel to the Fries rearrangement. The possibility of sequentially acylating the resulting phenol depends on the substrate and reaction conditions.
MODULATORS OF STIMULATOR OF INTERFERON GENES (STING)
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Page/Page column 54-55, (2020/01/08)
The present invention relates to compounds of formula (I) and salts, stereoisomers, tautomers or N-oxides thereof that are useful as modulators of STING (Stimulator of Interferon Genes). The present invention further relates to the compounds of formula (I) for use as a medicament and to a pharmaceutical composition comprising said compounds.