Hydrogenation of 5-Hydroxy-, 7-Hydroxy-, and 5, 7-Dihy droxyflavone with a Platinum Catalyst. SelectiveH ydrog enationo f FlavoneD erivatives. I.

盛夫, 鈴木; 英雄, 水野; 将博, 高井

doi:10.1246/nikkashi1948.88.6_675

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“…From diketone intermediate and claisenschmidt condensation reaction: Other names for flavone include 2-phenyl-4H-chromen-4-one and 2phenyl-1-benzopyra-4-one. They may react by a variety of processes, such as reduction reactions 11 , base-induced degradation 12 , substitution 13,14 , oxidation 15 , condensation 16 , rearrangement 17 , reactivity with organometallic reagents 18 , and addition 19,20,21 . To produce items with high yields, purity, and the necessary quality, a number of synthetic processes have been created and updated.…”

Section: Fig 7: Synthesis Route Of 6 -(2h) -1 3 -Benzoxazine -3 (4h)-...mentioning

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2023

IJPSR

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Flavones make up one of the biggest subgroups of the secondary metabolite class of flavonoids, which has more than 9000 known structural variations. It is shown that they are present in practically all plant tissues naturally. In the literature, many flavone aglyca and their O-or C-glycosides have been described. Numerous potential uses exist for flavones due to their wide range of biological activities in plants and their numerous interactions with other species. These include plant breeding, ecology, agriculture, human nutrition, and pharmacology, in addition to plant breeding. Flavones are abundant polyphenols of plant origin that have been extensively studied for their pharmacological properties. Flavones are a subclass of flavonoids with their structural basis in 2-phenylchromen-4-one (flavus = yellow). Cereals and plants are the primary sources of flavones. Since flavones are physiologically active substances, several synthetic techniques have been developed. We have attempted to include a variety of synthetic methods for the synthesis of flavones in this update. Claisen-Schmidt condensation and Baker-Venkatraman synthesis are two well-known techniques for creating flavones. It is widely known that derivatives of flavones exhibit a wide range of pharmacological actions. This study paves the way for thorough biochemical and molecular characterizations as well as the creation of direct metabolic engineering techniques for modifying flavone production in plants to increase their nutritional and/or medicinal value. INTRODUCTION:Drugs have traditionally been made from natural substances, mostly plant-based substances, and a significant fraction (30-40%) of the medications used in contemporary medicine are made either directly or indirectly from natural substances. The search for new drugs is also highly interested in natural ingredients. They enable the detection of key molecules of interest for the creation of novel therapeutic medicines due to their wide variety in nature.

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