Sesquiterpenes and an intermediate 1alpha, 6beta, 11-eudesmanetriol in the biosynthesis of geosmin from Streptomyces sp / 药学学报

One new sesquiterpene was isolated from the fermentation broth of Streptomyces sp. and the structure was elucidated by spectral analysis as caryolane-1, 6beta-diol (1). An intermediate 1alpha, 6beta, 11-eudesmanetriol (2) in the biosynthesis of geosmin was also found in this strain which proved sequence for the reactions, especially bicyclization preceding dealkylation.

Two diterpenoids from herbs of Huperzia serrata / 中国中药杂志

<p><b>OBJECTIVE</b>To investigate the constituents from Huperzia serrata.</p><p><b>METHOD</b>Two diterpenoid compounds were isolated by column chromatography with silica gel and Sephadex LH-20. The structures were elucidated by spectral analysis and X-ray crystallographic analysis.</p><p><b>RESULT</b>Their structures were determined as (15R)-12, 16-epoxy-11, 14-dihydroxy-8, 11, 13-abietatrien-7-one (1) and 3beta-hydroxysandaracopimaric acid (2).</p><p><b>CONCLUSION</b>Compound 1 was a new natural abietane-type diterpenoid, compound 2 was isolated from this plant for the first time.</p>

Two compounds from Drymaria diandra / 中草药

Objective To investigate the chemical costituents from Drymaria diandra. Methods Compounds were separated and purified by repeated column chromatographies on macroporous resin D101,silica gel, and RP-18.Two compounds were identified by spectral analysis. Results Two compounds were isolated from D. diandra. Theirs structures were identified as 6-carboxymethy1-5,7,4'-trihydroxyflavone (Ⅰ) and l-O-β-D-glucopyranosyl-(2S,3R,4E,8E)-Z-N-(2'-hydroxypalmitoyl) octadecasphinga-4,8-dienine(soya cerebroside Ⅰ,Ⅱ). Conclusion Compound I is a new compound. Compound Ⅱ is obtained from this plant for the frist time.