نتایج جستجو برای: 3 methylbut 1 ene
تعداد نتایج: 3594320 فیلتر نتایج به سال:
BACKGROUND The present report describes the semi-synthesis of a few O-prenylated phenolic derivatives and their in vitro antitumor activities. These compounds were prepared by modifying two naturally occurring antitumor phenols, 5,7-dihydroxy-3-(1'-hydroxy-1'-phenyl-methyl)-6-methoxy-chroman-4-one (A) and 2',4'-dihydroxy-3',6'-dimethoxychalcone (B), previously isolated from Polygonum limbatum M...
A new iridoid glycoside, 9-epi-6alpha-methoxy geniposidic acid (4), three new hemiterpene glycosides, 3-methylbut-3-enyl 2'-O-(beta-D-glucopyranosyl)-beta-D-glucopyranoside (nonioside K) (6), 3-methylbut-3-enyl 6'-O-(beta-D-xylopyranosyl)-beta-D-glucopyranoside (nonioside L) (8), and 3-methylbut-3-enyl 6'-O-(beta-D-xylofuranosyl)-beta-D-glucopyranoside (nonioside M) (9), and two new saccharide ...
The title compound, C(14)H(14)N(4)O(3), exhibits a trans geometry about the N=N double bond in the triazene unit. The mol-ecule is approximately planar (r.m.s. deviation = 0.044 Å for all non-H atoms). An intra-molecular N-H⋯O hydrogen bond occurs. In the crystal, C-H⋯N hydrogen bonds lead to the formation of dimers which are, in turn, connected to each other by C-H⋯O hydrogen bonds, forming in...
One new chromone 3,3-dimethylallylspatheliachromene methyl ether (1), as well as five known chromones, 6-(3-methylbut-2-enyl) allopteroxylin methyl ether (2), 6-(3-methylbut-2-enyl) allopteroxylin (3), 3,3-dimethylallylspatheliachromene (4), 5-O-methylcneorumchromone K (5) and spatheliabischromene (6), two alkaloids, 8-methoxy-N-methylflindersine (7) and 8-methoxyflindersine (8), and two limono...
A new simple phloroglucinol derivative characterized as 1-(6-hydroxy-2,4-dimethoxyphenyl)-2-methyl-1-propanone (1) was isolated from Hypericum cistifolium (Hypericaceae) as a major constituent of the non-polar plant extract. Minor amounts of this new compound, in addition to two known structurally related phloroglucinol derivatives (2 and 3), and two new terpenoid derivatives characterized, res...
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