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A novel hexahydrodibenzofuran derivative with potent inhibitory activity on melanin biosynthesis of cultured B-16 melanoma cells from Lindera umbellata bark.

TLDR
Compound 1 showed potent inhibitory activity on melanin biosynthesis of cultured B-16 melanoma cells without causing any cytotoxicity in the cultured cells or skin irritation in guinea pig.
Abstract
A novel cinnamoyl-hexahydrodibenzofuran derivative (1) was isolated from the bark of Lindera umbellata. The structure was determined by extensive spectroscopic analysis to be (5aR*,6R*,9R*,9aS*)-4-cinnamoyl-3,6-dihydroxy-1-methoxy-6-me thyl- 9-(1-methylethyl)-5a,6,7,8,9,9a-hexahydrodibenzofuran. Compound 1 showed potent inhibitory activity on melanin biosynthesis of cultured B-16 melanoma cells without causing any cytotoxicity in the cultured cells or skin irritation in guinea pig.

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Naturally occurring chalcones and their biological activities

TL;DR: The aim of this review is to summarize the various naturally occurring chalcone compounds which have been isolated from different plants to initiate further pharmacobotanical, biotechnological and medicinal studies on the field of chal cone research.
Journal ArticleDOI

Asymmetric Dearomatic Diels–Alder Reactions of Diverse Heteroarenes via π-System Activation

TL;DR: An asymmetric dearomatic Diels-Alder protocol for various heteroarenes, such as benzofuran, benzothiophene, or even furan, has been developed via π-system activation by efficiently constructed chiral fused frameworks with high molecular complexity and skeletal diversity.
Journal ArticleDOI

Oxidative cycloaddition and cross-coupling processes on unactivated benzene derivatives

TL;DR: Treatment of phenols or anilines containing a sulfonyl group in the presence of a hypervalent iodine reagent promotes a formal dearomatizing [2 + 3] cycloaddition reaction on unactivated benzene and naphthalene derivatives.
Journal ArticleDOI

Synthetic approaches to natural products containing 2,3-dihydrobenzofuran skeleton

TL;DR: The total syntheses of decursivine, serotobenine, lithospermic acid, linderol A, bisabosqual A, pterocarpans, conocarpan, heliannuols, and some resveratrol oligomers are reviewed, with emphasis on the synthetic strategies employed.
Journal ArticleDOI

Applications of Friedel–Crafts reactions in total synthesis of natural products

TL;DR: In this paper, a review of the applications of intermolecular and intramolecular Friedel-Crafts reactions in the total synthesis of natural products and complex molecules, exhibiting diverse biological properties is presented.
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