Results 231 to 240 of about 25,781 (272)

Attrition-Enhanced Deracemization and Absolute Asymmetric Synthesis of Flavanones from Prochiral Precursors

, 2020
Seven racemic 5,7-dimethoxyflavanones afforded conglomerate crystals upon recrystallization from a solvent. Three methodologies were investigated to achieve asymmetric transformation based on dynamic crystallization of the chiral conglomerate system. The
W. Shimizu, Naohiro Uemura, Y. Yoshida, T. Mino, Yoshio Kasashima, M. Sakamoto   +5 more
semanticscholar   +1 more source

Flavanones ofTanacetum sibiricum

Chemistry of Natural Compounds, 1981
Six flavanones have been isolated for the first time from Siberian tansy, and two of them have proved to be new compounds.
T. A. Stepanova, V. I. Sheichenko, L. P. Smirnova, V. I. Glyzin   +3 more
openaire   +1 more source

Citrus Flavanones Enhance β-Carotene Uptake in Vitro Experiment Using Caco-2 Cell: Structure-Activity Relationship and Molecular Mechanisms.

Journal of Agricultural and Food Chemistry, 2019
Flavonoids can interfere with the absorption of carotenoids. In this study, the inherent mechanisms of 12 citrus flavanones for β-carotene (Bc) cellular uptake and the structure-activity relationship were investigated.
Zhongyuan Zhang, Meimei Nie, Chunquan Liu, Ning Jiang, Chunju Liu, Dajing Li   +5 more
semanticscholar   +1 more source

Flavanone glycosides from Alhagi pseudalhagi

Phytochemistry, 1999
Two new flavanone glycosides, alhagitin and alhagidin, have been isolated from the whole plant of Alhagi pseudalhagi and their structures established respectively as naringenin 5-methyl ether 4'-glucoside and hesperitin 7-galactosyl(1-->2)[rhamnosyl(1-->6)]glucoside by chemical and spectroscopic methods.
V P, Singh, B, Yadav, V B, Pandey
openaire   +2 more sources

Synthesis of Flavanones via Palladium(II)-Catalyzed One-Pot β-Arylation of Chromanones with Arylboronic Acids.

Journal of Organic Chemistry, 2019
A total of 47 flavanones were expediently synthesized via one-pot β-arylation of chromanones, a class of simple ketones possessing chemically unactivated β sites, with arylboronic acids via tandem palladium(II) catalysis.
Hyung-Seok Yoo, S. Son, Yang Yil Cho, S. J. Lee, H. Jang, Young Min Kim, D. H. Kim, N. Kim, Boyoung Y. Park, Yong Sup Lee, Nam‐Jung Kim   +10 more
semanticscholar   +1 more source

Efficient Synthesis of Flavanone Glucuronides

Journal of Agricultural and Food Chemistry, 2009
The first efficient synthesis of flavanone glucuronides as potential human metabolites is described. The synthetic strategy is based on acetyl protection, followed by a combination of chemical and enzymatic deprotection steps. As an example, the method is applied to a synthesis of 7,4'-di-O-methyleriodictyol 3'-O-beta-d-glucuronide.
Ahcene, Boumendjel, Madeleine, Blanc, Gary, Williamson, Denis, Barron   +3 more
openaire   +2 more sources

Chemical Synthesis of Citrus Flavanone Glucuronides

Journal of Agricultural and Food Chemistry, 2010
Flavanone glucuronides are the major phenolic metabolites detected in human plasma after consumption of citrus fruits. As such, they might display significant cardioprotective effects. In this work, glucuronides of naringenin (4'- and 7-O-beta-d-glucuronides) and hesperetin (3'- and 7-O-beta-d-glucuronides), the major flavanone aglycones in grapefruit ...
Khan, Muhammad, Rakotomanomana, Njara, Loonis, Michele, Dangles, Olivier   +3 more
openaire   +4 more sources

Flavanones fromTephrosia leiocarpa

Phytochemistry, 1991
Abstract Roots and aereal parts of Tephrosia leiocarpa afforded two new flavanones, 5-hydroxy-7-methoxy-8-(3-hydroxy-3-methyl- trans -but-1-enyl)flavanone and 5-hydroxy-7-methoxy-8-(3-methyl- trans -but-1,3-dienyl)flavanone, named tephroleocarpin A and B, respectively.
Federico Go´mez-Garibay, Leovigildo Quijano, Tirso Rios   +2 more
openaire   +1 more source

The photochemistry of flavanone

Journal of the Chemical Society, Chemical Communications, 1972
On u.v. irradiation, flavanone rearranges to 4-phenyldihydrocoumarin and 2′-hydroxychalcone, and undergoes fragmentation to yield a highly reactive keto-keten.
P. O. L. Mack, J. T. Pinhey
openaire   +1 more source

Flavanones from Cyclotrichium niveum

Phytochemistry, 1989
Abstract A new flavanone isosakuranetin 7- O -rhamnoside was isolated from Cyclotrichium niveum together with known flavanones isosakuranetin and eriodictyol 7- O -glucoside, the flavones apigenin, apigenin 7-methyl ether, acacetin 7- O -rutinoside and the triterpenoids vergatic acid, oleanolic acid, β-amyrin and sitosterol.
S. Doganca, A. Ulubelen, E. Tuzlaci
openaire   +1 more source