115237-37-1

Upstream product

• 100-42-5 styrene 
• 49619-82-1 3-bromo-4H-chromen-4-one 
• 17422-74-1 3-Formylchromone 
• 16721-45-2 triphenyl(phenylmethylene)phosphorane 
• 103-82-2 phenylacetic acid 
• 1100-88-5 benzyltriphenylphosphonium chloride 
• 2613-89-0 phenylmalonic acid 
• 491-38-3 1-benzopyran-4(4H)-one 
• 118-93-4 o-hydroxyacetophenone 

Downstream Products

• 908609-18-7 (E)-3⁽⁵⁾-(2-hydroxyphenyl)-4-styryl-1H-pyrazole 
• 1005752-75-9 4-methoxy-2-phenyl-9H-xanthen-9-one 
• 1005752-91-9 3,4-dimethoxy-2-phenyl-9H-xanthen-9-one 
• 1033328-75-4 (E)-2,3-epoxy-3-styrylchroman-4-one 
• 93327-64-1 (2-hydroxyphenyl)(naphthalen-2-yl)methanone 

Relevant academic research and scientific papers

Condensation of chromone-3-carboxaldehyde with phenylacetic acids: An efficient synthesis of (E)-3-styrylchromones

An efficient and diastereoselective synthetic method for preparing (E)-3-styrylchromones has been developed by the reaction of chromone-3- carboxaldehyde with phenylacetic acids in the presence of potassium tert-butoxide under classical heating conditions or microwave irradiation. The Knoevenagel-type reaction followed by a decarboxylation was faster under microwave conditions.

Microwave-assisted Suzuki-Miyaura and Heck-Mizoroki cross-coupling reactions of aryl chlorides and bromides in water using stable benzothiazole-based palladium(II) precatalysts

The catalytic activity of benzothiazole-based Pd(II)-complexes was evaluated in Suzuki-Miyaura and Heck-Mizoroki C-C cross-coupling reactions of aryl chlorides and bromides with olefins and arylboronic acids both under thermal as well as microwave irradiation conditions in water. The factors affecting the optimization of such reactions as well as the reusability of the Pd-precatalysts are studied.

Synthesis and biological evaluation of 3-styrylchromone derivatives as selective monoamine oxidase B inhibitors

A series of 3-styrylchromone derivatives was synthesized and evaluated for monoamine oxidase (MAO) A and B inhibitory activities. Most of all derivatives inhibited MAO-B selectively, except compound 21. Compound 19, which had a methoxy group at R2 on the chromone ring and chlorine at R4 on phenyl ring, potently inhibited MAO-B, with an IC50 value of 2.2 nM. Compound 1 showed the highest MAO-B selectivity, with a selectivity index of >3700. Further analysis of these compounds indicated that compounds 1 and 19 were reversible and mixed-type MAO-B inhibitors, suggesting that their mode of action may be through tight-binding inhibition to MAO-B. Quantitative structure–activity relationship (QSAR) analyses of the 3-styrylchromone derivatives were conducted using their pIC50 values, through Molecular Operating Environment (MOE) and Dragon. There were 1796 descriptors of MAO-B inhibitory activity, which showed significant correlations (P 50 value index exhibited a determination coefficients (R2) of 0.972 and a Leave-One-Out cross-validated determination coefficients (Q2) of 0.914. These data suggest that the 3-styrylchromone derivatives assessed herein may be suitable for the design and development of novel MAO inhibitors.

Synthesis of Benzoaryl-5-yl(2-hydroxyphenyl)methanones via Photoinduced Rearrangement of (E)-3-Arylvinyl-4H-chromen-4-ones

A concise and efficient photoinduced rearrangement of (E)-3-arylvinyl-4H-chromen-4-ones for the synthesis of benzoaryl-5-yl(2-hydroxyphenyl)methanones is described. Benzoaryl-5-yl-(2-hydroxyphenyl)methanones were obtained in 77-95% yields via the irradiation of (E)-3-arylvinyl-chromones in the 95% EtOH with a high-pressure mercury lamp at room temperature under Ar atmosphere. The reported method provides a novel procedure for the synthesis of α,α′-diaryl ketone derivatives without addition of any transition metals and oxidants or other additives. A plausible mechanism was proposed, and the rearrangement product was characterized by NMR, HRMS, and X-ray.

Direct construction of xanthene and benzophenone derivatives via Br?nsted acid controlled Diels-Alder reaction of 3-vinylchromones and arynes

A Br?nsted acid controlled Diels-Alder reaction of 3-vinylchromones with arynes has been developed. By employing different kinds and amounts of acid, 9-aryl-9H-xanthen-9-ols or ortho-hydroxybenzophenones could be controllably furnished in good yields in an atom- and step-economic manner.

Palladium(II)-catalyzed direct intermolecular alkenylation of chromones

A new efficient method for the direct alkenylation of chromones via a palladium(II)-catalyzed C-H functionalization reaction was developed. The use of pivalic acid with Cu(OAc)3/Ag2CO3 provided superior reactivity in the c

Efficient synthesis of chromones with alkenyl functionalities by the heck reaction

The usefulness of the Heck reaction in the field of chromones has been demonstrated. Bromochromones with the halogen atom in their rings A and B were reacted with various terminal alkenes to give hitherto unknown alkenyl-substituted chromones. Reactivity of the substrates was found to markedly depend on the position of the bromine atom. Under phosphine-free conditions using a phase-transfer catalyst additive (tetrabutylammonium bromide), shorter reaction periods and usually higher yields were obtained.

New 4H-chromen-4-one and 2H-chromene derivatives as anti-picornavirus capsid-binders

Substituted (E)-3-styryl-4H-chromen-4-ones 1a-d, 3-[(1E,3E)-4-phenylbuta-1, 3-dienyl]-4H-chromen-4-ones 2a-d, (E)-3-styryl-2H-chromenes 3a-d and 3-[(1E,3E)-4-phenylbuta-1,3-dienyl]-2H-chromenes 4a-d were designed and synthesized to improve the anti-picornavirus activity of previously tested analogues. The new compounds were evaluated in vitro against human rhinovirus (HRV) serotypes 1B and 14 and enterovirus (EV) 71. All the compounds interfered with the replication of picornaviruses, although considerable differences were observed in the sensitivity of viruses to each compound. Generally, both HRVs were more susceptible than EV71 and their sensitivity was dependent upon the linker chain length as well as upon the oxidation state of the heterocyclic ring. (E)-3-Styryl-2H-chromene (3a) emerged as the most effective inhibitor of both HRVs showing IC50 values of 0.20 μM and 1.38 μM towards serotype 1B and 14, respectively. The potent activity was also coupled with low cytotoxicity resulting in high therapeutic indexes (250 and 36, respectively). Mechanism of action studies indicated that 3a, like structurally related compounds, behaves as a capsid binder interfering with the early stages of rhinovirus infection, probably at the adsorption and/or uncoating level.

Syntheses of (E)- and (Z)-3-styrylchromones

Several (E)- and (Z)-3-styrylchromones were prepared by two different methodologies, the Wittig reaction of chromone-3-carboxaldehyde with benzylic ylides and the Knoevenagel condensation of chromone-3-carboxaldehyde with phenylacetic acids in the presence of potassium tert-butoxide under microwave irradiation. The Knoevenagel reaction followed by a decarboxylation offered an efficient and diastereoselective method for preparing (E)-3-styrylchromones in a shorter reaction time. It was also demonstrated that phenylacetic acid can also be substituted with success by phenylmalonic acid. The stereochemistry of all products was assigned by NMR experiments.

Microwave-induced synthesis and regio- and stereoselective epoxidation of 3-styrylchromones

The microwave-assisted solvent-free synthesis of (E)-3-styrylchromones from 3-formylchromones and phenylmalonic acid on sodium acetate support has been developed; the method affords the styryl derivatives in moderate to good yields and with complete diastereoselectivity. Protocols for the highly regioselective epoxidation of (E)- and (Z)-3-styrylchromones have been elaborated. Treatment of the alkenes with dimethyldioxirane led to the exclusive formation of 3-(3-aryloxiran-2-yl)chromones with complete diastereoselectivity, whereas treatment with hydrogen peroxide under alkaline conditions afforded the corresponding 2,3-epoxy-3-styrylchromanones as the only products. Epoxidation performed in the presence of chiral, nonracemic cinchona-alkaloid-based quaternary ammonium salts allowed the synthesis of enantiomerically enriched 2,3-epoxy-3-styrylchromanones, but with only moderate ee values. Wiley-VCH Verlag GmbH & Co. KGaA, 2008.