- Depsides: Lichen metabolites active against hepatitis C virus
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A thorough phytochemical study of Stereocaulon evolutum was conducted, for the isolation of structurally related atranorin derivatives. Indeed, pilot experiments suggested that atranorin (1), the main metabolite of this lichen, would interfere with the li
- Vu, Thi Huyen,Lamer, Anne-Cécile Le,Lalli, Claudia,Samson, Jo?l Boustie Michel,Dévéhat, Fran?oise Lohézic-Le,Seyec, Jacques Le
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- Synthesis of barbacic acid
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A new approach for the synthesis of the active barbatic acid has been achieved in eight steps with 22.3% total yield by using commercially available methyl atratate as starting material. This synthesis provides access to multi-gram quantities of barbatic
- Long, Yi,Luo, Guo-Yong,Xi, Yin-Kai,Yang, Wu-De,Yu, Xiang
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- Method for synthesizing 2, 4-dihydroxy-3, 6-dimethyl methyl benzoate by using 4-O-demethylated barbatic acid
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The invention provides a method for synthesizing 2,4-dihydroxy-3,6-dimethyl methyl benzoate (synthetic oak moss) by using 4-O-demethylated barbatic acid, and relates to the technical field of chemicalsynthesis. The technical scheme comprises: hydrolyzing 4-O-demethylated barbatic acid into 2,4-dihydroxy-3,6-dimethyl benzoic acid by adopting an acid hydrolysis or alkali hydrolysis method; carryingout a methyl esterification reaction with a methylation reagent by using 2,4-dihydroxy-3,6-dimethyl benzoic acid as a substrate; and treating after the reaction is finished so as to obtain 2,4-dihydroxy-3,6-dimethyl methyl benzoate (synthetic oak moss). According to the invention, the synthetic oak moss is synthesized by using the new intermediate through two-step synthesis, so that the synthesisprocess is simplified.
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Paragraph 0089-0095
(2020/05/30)
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- PROCESS FOR STRAIGHTENING KERATIN FIBRES WITH A HEATING MEANS AND DENATURING AGENTS
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The invention relates to a process for straightening keratin fibres, comprising: (i) a step in which a straightening composition containing at least two denaturing agents is applied to the keratin fibres, (ii) a step in which the temperature of the keratin fibres is raised, using a heating means, to a temperature of between 110 and 250° C.
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- Chemical study on Garhwal Himalayan Lichen: Usnea emidotteries
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Usnea species are medicinally important, so we take unexplored species, Usnea emidotteris. Seven components 2-hydroxy-3-methoxy-4, 6-dimethyl ethyl benzoate, 2, 4-dihydro-xy-3, 6-dimethyl ethyl benzoate, 2-hydroxy-4-methoxy-3, 6-dimethylbezoic acid, usnic
- Rawat,Shukla, Vertika,Negi, Sandeep,Pant
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p. 2566 - 2570
(2007/10/03)
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- Hypoalectorialic acid and conechinocarpic acid, two new benzyl esters from lichens
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The benzyl esters hypoalectorialic acid [6-(2′,4′-dihydroxy-3′,6′-dimethylbenzoyloxymethyl)-2,4- dihydroxy-3-methylbenzoic acid] (5) and conechinocarpic acid [1′,4′-dihydroxy-6′-methoxy-3′-oxo-1′,3′- dihydroisobenzofuran-5′-ylmethyl 2-hydroxy-4-methoxy-3,6-dimethylbenzoate] (7) have been isolated from the lichens Hypotrachyna hypoalectorialica and Relicina samoensis respectively. The structure of the compounds (5) and (7) followed from a combination of spectroscopic and chemical data.
- Elix, John A.,Wardlaw, Judith H.
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p. 727 - 729
(2007/10/03)
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- LICHEN ACIDS, PLANT GROWTH INHIBITORS FROM USNEA LONGISSIMA
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Eight components, depsides and orcinol derivatives which exhibit growth-inhibitory activity against lettuce seedlings were isolated from Usnea longissima and identified from their physicochemical data.Key Word Index - Usnea longissima; depside; β-orcinol;
- Nishitoba, Yukiko,Nishimura, Hiroyuki,Nishiyama, Tohru,Mizutani, Junya
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p. 3181 - 3186
(2007/10/02)
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- TERT-BUTANOLYSIS OF LICHEN DEPSIDES
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The scope and limit of the tert-butanolysis of 12 lichen depsides is described.Neither 2-O-methylated nor 2-O-acylated compounds are cleaved by heating with tert-butanol.Key Word Index - Depsides: tert-butanolysis.
- Huneck, Siegfried
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p. 2697 - 2698
(2007/10/02)
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