- 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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- 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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