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Taxifolin 3-O-glucoside isomers, [(2R, 3R)-, (2R, 3S)-, (2S, 3R)- and (2S, 3S)-] were isolated from leaves of Chamaecyparis obtuse (Cupressaceae). Their structures were elucidated on the basis of UV,… (More)
Protein tyrosine phosphatases (PTPases) play an essential role in the regulation of steady-state phosphorylation of the insulin receptor and other proteins in the insulin signaling pathway. To… (More)
(2S, 3S)-Taxifolin 3-O-arabinoside, a new dihydroflavonol glycoside, together with the known substances, (2R 3R)-taxifolin 3-O-arabinoside, astragalin, isoquercitrin, and cosmosiin, were isolated… (More)
Reactions of 2-aminophenols, 2-aminothiophenol and o-phenylenediamines with 2-chloro-1,1,3,3-tetramethylformamidinium chloride proceeded easily via cyclization of guanidine intermediates to give the… (More)
The structure (I) of a new alkaloid, stemofoline isolated from the stems and leaves of Stemona japonica has been determined by X-ray crystallographic analysis of its hydrobromide monohydrate.