Me3SiI-promoted reaction of salicylic aldehydes with ketones: a facile way to construct benzopyranic [2,3-b]ketals and spiroketals
作者:Feijun Wang、Mingliang Qu、Xi Lu、Feng Chen、Feng Chen、Min Shi
DOI:10.1039/c2cc32545d
日期:——
Me3SiI-promoted reaction of salicylic aldehydes with ketones via arylmethylation at the α-site of the carbonyl group and cyclodehydration of keto-diol provided a facile way to construct heteroannular ketals, furnishing benzopyranic [2,3-b]ketals and spiroketals in moderate to good yields.
Benzopyran compounds, useful as chemotherapeutic agents
申请人:THE WELLCOME FOUNDATION LIMITED
公开号:EP0025599A1
公开(公告)日:1981-03-25
Known and novel compounds of formula (I)
wherein R4 is hydrogen or lower alkyl, R3 is hydrogen or lower alkyl and R5 is a substituent, or R3 and R5 together form a group -CH2- or -CH2-CH2-, and R1 and R2 each represent four substituents or one or both R1 and R2 represents a methylenedioxy group and two substituents are active against viruses, especially rhinoviruses. Methods for producing the compounds are described, as are pharmaceutical formulations and methods for administering the compounds to cure or prevent rhinoviral infections.
Esters of flavonoids with w-substituted c6-c22 fatty acids
申请人:Moussou Philippe
公开号:US20070184098A1
公开(公告)日:2007-08-09
Esters of flavonoids, including flavones, flavonols, flavanones, flavanols, flavanolols, isoflavones, anthocyanins, proanthocyanidins, chalcones, aurones and hydroxycoumarins conjugated by an ester bond to a ω-substituted C6 to C22 fatty acid are provided. The esters may be used in cosmetic, pharmaceutical, and nutritional preparations.
Stabilized 3-Hydroxyflavan Compositions and Methods Therefor
申请人:Hara Yukihiko
公开号:US20080300302A1
公开(公告)日:2008-12-04
Compositions and methods are directed to covalent adducts between reducing agents and optionally substituted 3-hydroxyflavans, wherein the reducing agent is covalently bound to the B-ring of the 3-hydroxyflavan. Such adducts exhibit markedly increased stability towards oxidation as compared to the unmodified 3-hydroxyflavan. Particularly preferred 3-hydroxyflavans include green tea catechins, and especially EGCG, while especially preferred reducing agents include NAC and glutathione.
METHOD FOR PRODUCING FLAVAN DERIVATIVE
申请人:Suzuki Keisuke
公开号:US20090099374A1
公开(公告)日:2009-04-16
The present invention provides a method for producing flavan derivatives having various substituent groups with controlling the stereochemistry. The method of the present invention includes the steps of: hydratively condensing a phenol compound expressed by formula (I) and an alcohol compound expressed by formula (II) to from an epoxide compound of formula (III); opening the epoxy ring of the epoxide compound of formula (III) to form an iodine-containing compound of formula (IV); and cyclizing the iodine-containing compound to form the flavan derivative of formula (V).